Tool directory

Flip cards and find the matching pairs.

Slide the tiles and add them up to 2048.

Measure how fast you react, in milliseconds.

Repeat the colour and sound pattern as it grows.

Eat, grow and try not to bite yourself.

Clear the board without hitting a mine.

Fill the grid so every row, column and box has 1 to 9.

Six tries to find the five-letter word.

Three in a row, against a friend or the computer.

Tap the moles before they duck back down.

Race through a passage and find out your words per minute.

Drop discs and line up four in a row.

Bounce the ball and smash every brick.

Tap to fly through 25 gates without touching one.

Swap fruit to make rows of three before the moves run out.

Switch every light off in as few moves as you can.

Slide the tiles back into order before time runs out.

Move the whole stack across, one disc at a time.

Fill the whole board with one colour in limited moves.

Remember where the numbers were, then tap them in order.

Twenty sums, sixty seconds. Wrong answers cost you time.

Name the ink colour, not the word. Harder than it sounds.

Find every hidden word before the clock runs out.

Unscramble twelve words against the clock.

Find your way out before time runs out.

First to seven against the computer.

Push every crate onto its mark. Undo is free.

Flip the discs, hold the corners, beat the computer.

Use the numbers to work out the hidden picture.

Eat every dot without getting caught.

Blast five waves of drifting rocks.

Build all four suits from ace to king.

Clear the layout by matching free pairs.

Fire bubbles up and clear the board.

Get five frogs over the road and river.

Clear three waves before they land.

Bounce upward and reach 2000 metres.

Drop each block square and build twenty floors.

Sink their fleet before they sink yours.

Guess the word before you run out of lives.

Crack the hidden colour code in ten guesses.

Pour until every tube holds one colour.

Slide the cars aside and free the red one.

Rotate the pipes until the water flows.

Take the last stone to win.

Jump pegs until only one is left.

Complete more boxes than the computer.

Change one letter at a time to reach the target.

Hit thirty targets in thirty seconds.

Join matching tiles with a short path.

Hit the notes as they cross the line.

Get five in a line before the computer does.

Take every piece. Captures are compulsory.

Sow seeds and fill your store.

Nine small boards inside one big one.

Two colours, no three in a row, equal counts.

Join the dots and fill every square.

Fill the grid and satisfy every inequality.

Place the queens so none attacks another.

Crack the letter code and read the quotation.

Find 1 to 25 in order, fast.

First to ten against an opponent that reads you.

Cross sums with a single answer, every time.

How many buildings can you see from there?

A Latin square where every cage has a target.

Black out the repeats without splitting the grid.

Find the dominoes hidden in the numbers.

One tent per tree, and none of them touching.

Join every island without crossing a bridge.

Cut the grid into rectangles, one number each.

Draw cards to get as close to 21 as you can without going over.

Keep the cards you like, swap the rest, score the hand.

Thirteen rounds, three rolls, one target.

Push your luck against a computer that knows when to stop.

Every card face up. No luck left in it.

Pairs that add up to thirteen.

One above or one below, all the way down.

Connect your two sides. Draws are impossible.

Four hounds against one fox on a draughts board.

Three in a row takes one of theirs.

Land on every square exactly once.

Four numbers, four operations, one target.

Two bikes, solid walls, nobody can stop.

Down gently, upright, on the pad.

Six cities and a sky full of incoming.

Drag your mallet. First to seven.

One king running for the corner, eight attackers closing in.

Twenty goats that cannot fight, against four that can.

Was that square where it was two steps ago?

One tile is a slightly different shade. Find it.

Watch the blocks light up, then tap them back.

One move only: slide the spatula in and flip.

Wolf and goat, missionaries, jealous couples.

Six numbers, one target, four operations.

Three pegs, three balls, one arrangement to reach.

Which dominoes are magnets, and which way round?

Claim lines. Whoever makes a triangle loses.

Ten frames, real pin physics, real scoring.

Three darts a turn, and you must finish on a double.

A race to the far corner. Nothing is ever captured.

Shoot it and it splits in two.

Count the hand before the clock beats you.

Two five-card hands, one clock. Which one ranks higher?

Read the rhythm, not the dots.

Two packs, ten columns, eight suits to build.

One tap. Every ball you catch sets off another.

Aim wide. The planets do the steering.

Read the current. Spend thrust only on the turns.

Only the ring pops them. Find the circle they all sit on.

Flip the mirrors. Send red and blue to their own targets.

One wedge is not like the others. Tap it before the clock goes.

Hit the target colour. The pot is the average of what is in it.

Let go at the right moment. Nothing steers it after that.

Fill the gaps. Every gear you add reverses the one before it.

Hang the weights so every beam hangs level.

One coin is the wrong weight. The balance answers three ways.

All the same or all different, on every count.

Write the whole program first. Then watch it go wrong.

A 2×2 cube, unfolded flat. Undo the scramble.

A column addition with the digits hidden behind letters.

Walk 1 to the last square, touching every one on the way.

Put the missing numbers back so every line makes the same total.

Fill each block, and never let two of the same touch.

Draw to the button, or knock theirs out of the way.

Land them all. Keep them apart while you do it.

Close the flaps that add up to the roll. All of them, ideally.

Bumpers, drop targets and two flippers. Three balls.

Each run of white squares holds consecutive numbers, any order.

Each number says how many squares are in its own block.

Sets and runs. Get your deadwood down and knock.

Take as few points as you can. Mind the queen of spades.

Name the trump and take three. Mind the bowers.

Say how many tricks you will take, then take exactly that many.

Seven flat pieces, one silhouette. No gaps, no overlaps.

One closed loop through every pearl. White runs straight, black turns.

White to play. One move ends it — find which.

Race them home. Leave a blot and it goes back to the bar.

Span the gap. Triangles hold, squares fold.

One closed loop. Each number counts its own square’s sides.

Every number is an island. The rest is one connected sea.

Surround a stone and take it. Go, with only the capturing rule.

Sixteen pawns each. First one to the far row wins.

Race the computer to a hundred. Ladders up, snakes down.

Drop a ball through the pegs into the gold bin, which moves every turn.

A falling column of three gems. Match three in any direction.

Place bulbs to light every square, without dazzling each other.

Sudoku with cage sums instead of given digits.

Slide the blocks until the big square finds the exit.

Three pyramids of cards, cleared one rank at a time.

Match suit or rank, play a wild eight, empty your hand first.

Guess how many dice are hidden, or call the other player out.

Keep rolling to build your turn total, but a one wipes it.

Falling pairs of blobs. Four touching pop, and the chain doubles.

Hop across a pyramid of cubes and change every one.

Two guns, one hill, and the wind. Land a shell on the other one.

Shoot marbles into a crawling line and clear it in threes.

Nine holes of crazy golf, with bounces, sand and water.

Hawaiian checkers: jump, capture, and never run out of moves.

Shade dominoes so every room holds exactly two squares.

Pack the five-square shapes into the box with nothing left over.

Words fall, typing destroys them. Typing practice with a score.

Fan Tan: build each suit out from its seven, and block.

The draw game with a double-six set, against a computer that counts.

Move a queen, shoot an arrow, and shrink the board.

Race four tokens round the board and knock theirs back.

Stars in every row, column and region, never touching.

Pour water into tanks until every row and column adds up.

Move by the number of pieces on the line; gather yours into one group.

Upright against flat dominoes. Run out of room and you lose.

Capture by value or by total, and hunt the seven of coins.

Russian attack-and-defend. The last one holding cards is the fool.

One button, one cave, and walls that keep closing in.

Guns and mortars against waves that follow the road.

Klondike without the stock, and any card moves with its pile.

Numbers count the filled squares around them, and a picture appears.

Shade squares so every row and column reaches its total.

Sudoku whose boxes have been replaced by irregular shapes.

Shade squares under four rules, one of which limits corridors.

Capture by sending a piece around one of the board loops.

Madagascar’s national game — capture by approach or by withdrawal.

Take table cards that match your card or add up to it.

Blow up a brick maze and clear it of enemies.

Four in a row in a cube, through faces and corners alike.

Guess a hidden number from bulls and cows, with a live count of what is left.

Find words in the letter grid before three minutes run out.

Mix primaries into secondaries to claim the board against the computer.

Seed a grid so majority rule turns the whole board your colour.

Light one square so the fire burns exactly the number of cells asked for.

Flip mirrors so beams mix into the exact colour each target needs.

Shift each track so exactly one hit lands on every beat of the bar.

Spend your stones topping columns the computer cannot legally take back.

Pulse emitters to push and pull every particle onto its ring at once.

A maze where a rotating current moves you after every step you take.

Place heating elements so every pot reaches exactly the temperature it needs.

Set every crossing so the counts match and no thread floats over three in a row.

Place springs so every copper tile weathers to exactly the shade it needs.

Place stones so every marker is lit or shaded correctly at all three hours at once.

Steer a balloon by choosing which band of wind to ride.

Combine materials up a recipe tree to fill the order in as few steps as possible.

Rebuild a stack of cubes from its side view, front view and total.

Route falling water through chutes so every basin fills to exactly its mark.

Nudge planets on their rings so every one reaches the meridian in the same year.

A board that closes in as you play — be the one who can still place a stone.

Fill a grid so every pair of neighbours is opposite, adjacent or unlike on the colour wheel.

Drop pebbles so the ant’s shortest route is exactly the length you are asked for.

Set the junctions and send a train through track that turns behind it.

Find hidden wrecks from distance readings, in as few pings as you can.

Cross a causeway that floods and drains on a cycle.

Set tower delays so every lamp in the network lights at the same moment.

Cross a marsh where the soft ground sinks behind you.

Flip crossings until the tangle is provably not a knot at all.

Plant seedlings so a parity growth rule reproduces the outline exactly.

Shunt wagons into a new order using one dead-end siding.

Load a barge so no hold is over its limit and the trim comes out level.

A face-down duel where the rope moves by the difference between the cards.

Place clay so falling water settles into exactly the right squares.

Place beacons so every watchpost sees exactly the number it asks for.

Turn winches that move several platforms at once until all of them sit on their marks.

Rotate painted tiles so every joint matches, except the ones marked to differ.

Post sentries with lines of sight, taking what they see and avoiding what sees you.

Engage clutches and turn gears until every one sits on its mark.

Reorder a stack of sieves so each tray catches exactly the grains listed.

Fold a printed strip into a single pile in exactly the order asked for.

Colour a map in three colours so no two counties sharing a border match.

Take blocks from a rock face without letting anything above them fall.

Drop grains so a chain of topplings settles into the pattern asked for.

Darken squares so a two-rule beetle wanders its way to the gate.

Choose logic gates so the lamp matches every row of the truth table.

Walk every path exactly once — Euler’s bridges, as a puzzle.

Plan a delivery round where the tank empties as you drive and only depots refill it.

Mark creases mountain or valley so the sheet folds flat at every point.

Record one run, then work alongside a replay of yourself to open the gate.

Place burners so the sheet settles to exactly the temperatures asked for.

Arrange comparators into a machine that sorts every possible load.

A maze on a cylinder, Mobius band, torus or Klein bottle, where the edges join in odd ways.

Match every bird to a nest box it will accept, one bird per box.

Escape a maze while a chaser walks straight at you every turn.

Set populations so every animal in the food web gets exactly the food it needs.

A blind auction where the purse matters more than the lot.

Pick chord roots so every change shares a note and no root leaps too far.

Set a machine whose wheels each count in a different base, in as few pulls as you can.

Split a white beam into red, green and blue and land each colour on its own catcher.

Hammer a bar of metal into a given shape, moving metal sideways but never losing any.

Lay a single closed thread that winds round each peg exactly the number of times it asks for.

Press wrapping stamps that advance dials by one until the whole plate reads zero.

Ring the bells into a new order, swapping only neighbours and never repeating a row.

Sort a stack of pancakes by flipping the top few — which turns them over as well.

Find the cheapest set of pipes to block so no water reaches the sink.

Breed plants towards a target flower, choosing one seed from every cross.

Balance a real chemical equation by setting how many of each substance take part.

Pair boats with moorings so no boat and mooring would rather have each other.

Count round a ring of beads to lift every tarnished one for as little counting as possible.

Set code lengths so a message goes down the wire in as few bits as possible.

Build a fraction out of distinct unit fractions, in as few pieces as possible.

Site the wells so every cottage’s nearest one is the colour it is painted.

Find the false coin, and whether it is light or heavy, on a balance with no weights.

Draw equal, joined-up wards so a stated side wins a stated number of them.

Close roads until the average journey through the town is as short as it can be.

Design a coinage that pays every price exactly, using as few coins as possible.

Schedule boat-building stages across limited slipways to launch by the promised day.

Choose the fewest nets that between them catch every species in the survey.

Wind dials of different cycle lengths until all of them read zero at once.

Place two speakers so every listener sits in a loud band and every sleeper in a quiet one.

Build a full fixture list where every club plays every other exactly once.

Fit gearing so the winch can lift the load without running out of rope.

Lay the cheapest network of cable that connects every village.

Pack a quayside of goods into the fewest crates, with nothing split.

Take coins from one pile or the same number from both, and take the last one.

Draw officers up so no regiment, rank or combination ever repeats in a line.

Send nine walkers out in threes so every pair walks together exactly once.

Break the long loops in a misfiled cabinet so every clerk can find their docket.

Hire the best candidate when you see them one at a time and cannot go back.

Double what you commit or lose it, and reach the mark before your reserve runs out.

Choose which streets to walk twice so the postman’s round closes at least cost.

Post the fewest guards that between them overlook every corridor.

Brace a hall into triangles using the least length of timber.

Deal cards into piles so Bulgarian solitaire takes as long as it possibly can.

Mark every pair of guests friends or strangers while avoiding a monochrome threesome.

Ferry everything across a river without leaving two that quarrel alone together.

Choose the most valuable load a wagon of limited capacity can carry.

Choose how often to play each move so the worst reply is as good as possible.

Press a string of digits containing every possible code, in the fewest presses.

Order a line so no long run rises and no long run falls.

Design a repeating border with exactly the symmetries required and no others.

Find a hidden number by asking yes-or-no questions of a witness who may lie once.

Draw a diagonal in every square without ever closing a loop.

Split the grid into regions that are symmetric about their own dots.

Sudoku solved from dots between squares rather than given digits.

Connect your two edges with knight’s-move links that may not cross.

Two-player tricks where the ten outranks the king and marriages score.

Italian tricks where the ace and three carry most of the points.

Squeeze a row of fifty-two cards into as few piles as possible.

Patience where any face-up card moves with the whole pile on top of it.

Dig for gems and reach the exit before a boulder lands on you.

A layered photo editor — layers, masks, selections, curves and AI cut-out.

Resize, compress, convert, crop, rotate, watermark and more — many images in one pass.

Turn iPhone HEIC photos into JPG or PNG anyone can open.

Create passport and visa photos at official sizes for any country.

Arrange photos into a grid collage and download as one image.

Slice an image into a grid for carousels and puzzle feeds.

Pixelate or blur faces, plates and private details.

See the hidden data in a photo, then strip it out.

Pull hex codes and a colour palette out of any picture.

Every icon size a website or app needs, plus the manifest.

Turn an image into a data URI, or decode one back.

Classic top and bottom text, or free placement.

Drop a screenshot onto a gradient with shadow and rounded corners.

Before/after slider to check two versions side by side.

Convert a picture into text art you can paste anywhere.

Generate dummy images at any size for mockups.

Clean up SVG code and export it as PNG at any size.

Build an animated GIF from a set of images.

Pack images into a sprite sheet or split one apart.

Arrows, boxes, numbered steps and blur, drawn on a screenshot.

Turn an image into a tile that repeats with no seam.

Join screenshots into one long image.

Read camera actuations from a photo.

Drag four corners, get a straightened image.

Photo of a page in, clean straight scan out.

Double exposures and texture overlays.

A whole shoot on one labelled grid image.

Histograms, clipping stats and an exposure verdict.

Draw sprites on a grid; export scaled PNG.

An animated GIF, still frames, or a contact sheet of every scene.

Trim, crop, rotate, speed, colour, watermark — stacked, in one pass.

Record your screen or camera and save the video.

Convert SRT and VTT, shift timings, merge tracks.

Repeat a short clip several times over in one file.

Merge several video clips into one file.

Cut a video into several shorter pieces.

Convert an animated GIF into an MP4 or WebM.

Turn a set of photos into a video slideshow.

Frame-by-frame animation with onion skinning.

Audio clips into shareable waveform videos.

Pretty-print, minify, validate and explore JSON as a tree.

Base64, URL encoding and escaping for HTML, JS, SQL and regex.

MD5, SHA-1, SHA-256 and SHA-512 for text or whole files.

Read the header, payload and expiry of a JSON Web Token.

Generate v4 UUIDs one at a time or by the thousand.

Test patterns live with match highlighting and groups.

Explain a cron line in plain English and show next run times.

Unix epoch to human date and back, in any time zone.

Binary, octal, decimal, hex and any base from 2 to 36.

HEX, RGB, HSL conversion plus a WCAG contrast checker.

Build linear and radial gradients and copy the CSS.

Box and text shadows with a live preview.

Format or compress HTML, CSS, JS, SQL and XML.

Generate robots.txt and XML sitemaps for a site.

Tidy up or minify SQL queries.

Convert HTML to Markdown and Markdown to HTML.

CIDR ranges, masks, host counts and subnet splitting.

Break a link into its parts and edit the query.

Work out the browser, system and device from a user agent.

Fluid font sizes and spacing with one line of CSS.

Shape corners with a live preview, including blobs.

Design a cubic-bezier easing curve and see it move.

Frosted glass panels with a readability check.

Blobs, wave dividers and patterns as clean SVG.

Compare two JSON documents by structure, not by text.

Pull specific values out of a JSON document with a path.

Convert between .env, INI, JSON and shell exports.

Build a .gitignore for your stack, with explanations.

See exactly which versions a semver range allows.

Search HTTP status codes and file type names.

Code points, names and bytes for every character.

Encode and decode Base32, Base58 and friends.

Title, description and social card tags, with a preview.

JSON-LD for articles, products, businesses and more.

Keyframe animations with a live preview.

Turn code into a shareable image with syntax colours.

Tidy, minify and check XML.

Check JSON against a schema.

JSON in, typed classes and interfaces out.

curl commands to fetch, axios or Python.

HTML in, React-ready JSX out.

Rank selectors; see why one wins.

Visual grid layout, CSS out.

Every flex property, applied live.

px, rem, em, pt, vw, vh — converted in context.

Pretty-print or minify GraphQL.

IDN domains to xn-- form and back.

Campaign URLs, plus a QR code.

Permissions to octal, and back.

Read network logs, with a waterfall.

Render a unified diff or .patch file readably.

Build a Content Security Policy, with a real audit.

Build a Cache-Control header, explained.

Commit messages and changelogs from them.

Pick an open source licence and get the text.

Build a README that leads with what it is.

Sign, exponent, mantissa and the exact stored value.

AND, OR, XOR, shifts and rotates at any width.

Test selectors against HTML, with specificity.

Redirect rules for Apache, nginx and Caddy.

Sortable, short and compact ID alternatives to UUID.

Byte-level diff of two files, in hex.

Run commands to compose files and back.

Find accessibility faults in pasted HTML.

Read a .js.map: bundle sizes and real positions.

Build zone file records and check their grammar.

Summarise an nginx or Apache access log.

Apply or reverse a unified diff, or make one.

Take a pasted HTTP request or response apart, and check how it is framed.

Read an OpenAPI 3 or Swagger 2 file as browsable documentation.

A drag-and-drop board with WIP limits that stays in this browser.

Mark off habits on a grid and watch the streaks build.

Live counts for words, characters, sentences and reading time.

UPPER, lower, Title, Sentence, camelCase, snake_case and more.

Sort, reverse, shuffle, number and remove duplicate lines.

Highlight what changed between two blocks of text.

Bulk replace with plain text or regular expressions.

Write Markdown with a live preview and export to HTML.

Placeholder paragraphs, sentences or words.

Turn a title into a clean URL slug.

Strip HTML, extra spaces, line breaks and special characters.

Turn plain words into stylish Unicode fonts for bios and usernames.

Repeat any word or line as many times as you need.

Search thousands of emoji and symbols and copy them instantly.

Have any text read aloud using your device voices.

Translate to and from Morse code, with audio playback.

ROT13, Caesar shift, Vigenere and Atbash, encode and decode.

Numbers to Roman numerals and back.

Convert text to binary, hex or decimal codes and back.

Score your writing for reading difficulty and find the hard sentences.

Word and phrase counts with density percentages.

Rank every word in a text by how often it appears.

Write numbers out in words, including money for cheques.

Bold the front of every word for faster scanning.

Strip zero-width spaces and other characters you cannot see.

Turn a word into big letters made of characters.

Turn typed text into handwriting on paper, as an image.

References in APA, MLA, Harvard, Chicago and IEEE.

Check anagrams, rearrange names, and find words in your letters.

Score how alike two texts are.

Text to Alfa Bravo Charlie, and back.

Text to Unicode braille cells, and back.

Find fillers, hedges and clichés in a draft.

Open, edit and save Word documents.

An autosaving scratchpad. No account.

A checklist that saves in your browser.

Scrolling script reader with mirror mode.

Text in, a downloadable word cloud out.

Usernames, handles and brandable names.

Pattern search and words from your letters.

Strip accents and romanise to plain ASCII.

Curly quotes, proper dashes and ellipses.

Tabs, line endings and invisible characters.

A linked contents list from Markdown headings.

Lines, commas, JSON, SQL — converted properly.

Hard-wrap and justify text to a column width.

One sentence per line, without false breaks.

Syllables, haiku checking, pangrams and isograms.

Letter frequencies, index of coincidence, cipher clues.

Split long text into numbered parts that fit a limit.

Find and remove personal details from pasted text.

Convert spelling and words between British and American English.

A timed agenda that turns into minutes and actions.

Repair text that arrived full of strange characters.

Number an indented outline as clauses, sections or paragraphs.

Format a plain-text script into printable screenplay pages.

Lay an essay or story out to MLA, APA, Chicago or manuscript rules.

Turn two versions into one marked-up tracked-changes document.

Split names into their parts, sort by surname, reformat.

Track equipment, depreciation and what maintenance is due.

Tidy a mailing list: syntax, duplicates, aliases, role and disposable addresses.

Merge contact exports and settle the duplicates field by field.

Split messy one-line addresses into proper fields, then reformat them.

Track invitations, replies, headcount and meal choices in one list.

Stock levels, reorder alerts and a count sheet that shows the variance.

Fair positions, offers recorded, and a wait estimate from real throughput.

Convert CSV or TSV to JSON, and JSON back to CSV.

XLSX to CSV, JSON or the other way round.

Open a big CSV, sort, filter and edit it in a table.

Remove duplicate rows or merge several CSV files.

Break a huge CSV into smaller files by row count.

Convert freely between YAML, XML and JSON.

Paste data, get a chart, download it as PNG.

Join two CSV files on a shared column.

See what changed between two versions of a file.

Group and summarise data like a pivot table.

Mean, median, spread, quartiles and outliers.

Convert tables between CSV, Markdown, HTML and JSON.

Turn aligned text columns into proper CSV.

Run SELECT queries against a CSV file.

Turn a spreadsheet into a vCard contacts file.

Turn a list of events into an importable calendar file.

View and convert GeoJSON, GPX, KML and coordinates.

Replace personal details with realistic fake ones.

Make test rows as CSV, JSON or SQL.

Pull emails, links and numbers out of text.

.vcf contacts to a spreadsheet.

Read .ics files; export events to CSV.

A CSV in, a sheet of QR codes out.

Edit Markdown tables in a real grid.

Column types, missing values and data quality checks.

Check IBAN, ISBN, EAN, VIN, IMEI and card numbers in bulk.

Flatten nested JSON into CSV columns, and put it back.

Score options against weighted criteria and rank them.

Merge a CSV into a letter, email or certificate template.

Join two lists that share no exact key, with a score per pair.

Diagnose and fix a CSV that will not open properly.

Turn wide columns into tidy rows, and back again.

Generate CREATE TABLE and INSERT statements from a CSV.

Resample timestamped rows onto a regular interval.

Convert a bank or card CSV export into a QIF file.

What that meeting costs, live, and what a shorter one would save.

Budget an event by category with quoted, actual and cost per head.

How much you could borrow, which lender rule binds, and what is left each month.

Length, weight, volume, area, speed, temperature and data.

Every common percentage question in one place.

Monthly payment, total interest and a full amortisation table.

Days between dates, add or subtract time, work out an age.

Body mass index, BMR and daily calorie needs.

Split a bill fairly, with or without a tip.

Add or remove tax at any rate.

Random numbers, names, teams, dice and coin flips.

Countdown, stopwatch and a pomodoro mode.

Full expression calculator with history.

See how savings grow over time, with a year-by-year table.

Work out what regular monthly investing could be worth.

Turn an annual salary into monthly, weekly and hourly figures.

How much you might need, and whether you are on track.

Estimate a due date and see the week-by-week timeline.

Estimate your fertile window from your cycle length.

Estimate body fat percentage from simple measurements.

Daily protein, carbs and fat targets for your goal.

Pace, time and distance, plus finish times for common races.

Count the days, weeks and months between any two dates.

A live countdown to any event, ready to share.

Compare times across cities and plan a meeting.

Count business days between dates, skipping weekends.

Add up a week of shifts, breaks, overtime and pay.

See what any appliance costs to run per day, month and year.

Find the width or height that keeps a picture the same shape.

Sale prices, savings, and what stacked offers really come to.

Margin, markup and the price you need to charge.

How many units you must sell before you start making money.

How long to reach a savings goal, or how much a month it takes.

What money will be worth after years of rising prices.

Every payment on a loan, and what overpaying would save.

Work out who owes who after a trip or a shared house.

Trip fuel cost, real mileage, and what sharing saves.

Cups to grams for real ingredients, plus recipe scaling and oven temperatures.

Bedtimes and alarm times that land between sleep cycles.

How much water to drink a day, from weight, activity and climate.

Healthy weight range for your height, from four standard formulas.

Your dog or cat's age in human years, done properly.

Add, subtract, multiply and divide fractions, with the working.

Linear, quadratic and simultaneous equations, with the steps.

Multiply, invert, transpose and find determinants.

How many ways to choose or arrange — nPr, nCr and factorials.

Any two of speed, distance and time give you the third.

How big a photo can print, and whether it is sharp enough.

Pixel density, real dimensions and viewing distance for any screen.

Grade point average from your subjects, on any scale.

The mark you need on the final to reach the grade you want.

Compare renting and buying, honestly.

Snowball vs avalanche, with real numbers.

Five training zones, Karvonen method.

Estimate 1RM and training percentages.

Widmark BAC estimate and time to zero.

Litres and tins of paint for a room.

Tiles, boxes and wastage for any area.

Concrete volume and bags of pre-mix.

Solve a triangle from any valid three values.

Area, perimeter, surface area and volume.

Colour bands to value, plus Ohm’s law.

Sun times and twilights for any coordinates.

How long a file takes at a given speed.

Bitrate, duration and file size.

Chargeable weight — size against weight.

Star sign, Chinese zodiac and birthstone.

Focus sessions with automatic breaks.

Alarms and countdowns, with snooze.

Hydration, salt and starter by baker's percentage.

Dose, water and yield for any brew method.

Roasting times, temperatures and carryover.

Salt for a wet brine or an equilibrium cure.

Drink strength after dilution, plus units.

Safe thawing times and how long food keeps.

Rescale a recipe and keep the fractions measurable.

Categorise a reading by both guidelines.

Calories by activity and duration, gross and net.

Estimate VO2 max from a field test.

Wilks, DOTS and IPF GL points from a total.

Steps to km and back, using your stride.

Clock times for a course of medicine.

mg/dL to mmol/L, and HbA1c to average glucose.

Compound annual growth rate and doubling time.

Four methods with a year-by-year schedule.

The hourly rate that actually pays a salary.

Split take-home pay into needs, wants and saving.

Assets less debts, with liquid net worth.

How much to keep aside, and how long to get there.

Count a till, or split an amount into notes and coins.

Which packet is really cheaper, per unit.

Interest and compensation on an overdue invoice.

Prime factors, GCD and LCM, exactly.

Truth tables and minimal boolean forms.

Union, intersection and difference of two lists.

Exact arithmetic on arbitrarily large integers.

Mod, modular powers, inverses and primality.

V, I, R, P, voltage dividers and LED resistors.

C1V1 = C2V2 and serial dilution planning.

Range, height and flight time of a projectile.

Formula weight, with brackets and hydrates.

Polynomial arithmetic and root finding.

Significance and confidence interval for two rates.

Survey and A/B test sample sizes.

Correlation, regression line and R² from two columns.

Normal, binomial and Poisson probabilities.

Charge cost, real range and charging time for an electric car.

Distance, bearing and midpoint between two coordinates.

Cartons per pallet and pallets per container.

Compare two tyre sizes and see the speedometer error.

Plot formulas and find roots, turning points and areas.

Add, subtract and total lengths of time.

Count, round and carry significant figures through a sum.

Balance an equation, then do the mole and mass sums.

Slope, midpoint, distance and the equation of a line.

Solve PV = nRT and the before-and-after gas laws.

Near and far limits, hyperfocal distance and field of view.

Dot and cross products, angles, lengths and projections.

Dew point, feels-like temperature and the water in the air.

A lesson plan form where the timings actually add up.

End-of-term reports with a comment bank that gets the names right.

Trip consent forms with a tear-off reply slip, blank or per pupil.

Split a class into even groups, keeping named pairs apart.

A big countdown for the whiteboard, with a chime.

Practice sheets, gap fills and dictation lists from a word list.

Multiplication drill that targets the facts you get wrong.

Printable marking rubrics with points that add up.

Printable seating charts with keep-apart rules.

Printable exit ticket slips with your own prompt.

Traceable four-line handwriting worksheets.

Printable number lines and fraction strips.

Printable sticker and reward charts.

Printable reading logs with the columns you choose.

Printable quizzes with an answer key and shuffled versions.

Printable bubble answer sheets with a matching marking key.

Printable clock worksheets with a proper geared hour hand.

Turn a passage into a gap-fill worksheet with a key.

Time a reading and get words correct per minute and accuracy.

Printable class registers with live attendance percentages.

Fair weekly classroom job rotas, printed for the whole term.

Period times, breaks, shortened days and assembly days.

Weighted class marks, grade boundaries and class statistics.

What a cord really is, and whether wood beats gas at your prices.

Where the litres go, what they cost, and what changing would save.

Which skip actually holds it, and whether room or weight stops you.

Plan a week of meals and get one merged list sorted by aisle.

Shingle bundles and roof area from pitch and footprint.

Tonnes of gravel, sand, soil or bark for any area.

Board feet, volume and cost for any timber.

Pool litres and gallons, plus how much chemical to add.

Planks, packs and row layout for a plank floor.

Roll length, drops and seams for any room.

Rolls and drops, with the pattern repeat handled.

Boards, joists and screws for a timber deck.

Risers, going, pitch and stringer length for a flight.

Posts, panels and concrete for a run of fencing.

Studs, plates, noggins and boards for a partition wall.

Tank volume, weight, floor load and stocking.

U-values, R-values and heat loss for any build-up.

Roof catchment, yearly yield and the right tank size.

Array size, real yearly output and battery sizing.

Litres and tins for a room, with the mist coat allowed for.

The smallest cable that carries the load and holds the voltage.

Heating and cooling load for a room, line by line.

Bricks, blocks, mortar and course heights for a wall.

How far a shelf will bend, and whether that shows.

Pole length, drop, fabric metres and a pleat plan.

Seed weight and fertiliser bags for a lawn of any shape.

Plants per bed at any spacing, square or offset.

Nail heights and spacing for a picture or a gallery wall.

Strong random passwords and memorable passphrases.

See how long a password would really take to crack.

AES-256 encrypt a message with a password.

Password-protect any file with AES-256-GCM.

Turn a 2FA secret into the current six-digit code.

Generate RSA and elliptic-curve key pairs.

Remove hidden data from images and Office files before sharing.

Check a downloaded file against its published fingerprint.

Generate and verify HMAC signatures for webhooks and APIs.

Memorable passphrases with an honest strength figure.

Password file entries for Apache and nginx.

Read an SSL certificate: names, dates and fingerprints.

Hide and reveal a message inside a picture.

Sign messages and verify signatures with a key pair.

See what your browser reveals about you without cookies.

Shamir's secret sharing: any K of N shares.

Generate a private key and CSR.

Read an SPF or DMARC record and count its lookups.

Identify a hash and read the settings stored inside it.

Grade a block of response headers and get a corrected set.

Work out whether a cross-origin call would be allowed, and why not.

Score a vulnerability with the CVSS v3.1 equations.

Generate lookalike domains and score a suspicious one.

Convert a key between PEM and JWK and build a key set.

Read an SSH public key: type, size, fingerprint and restrictions.

Find keys and tokens in pasted code and get a redacted copy.

Build or check a security.txt, including the expiry date.

Trim a song or recording to just the part you want.

Stitch several audio files into one track.

Convert between MP3, WAV, OGG, M4A and FLAC.

Boost quiet recordings or even out loudness.

Change tempo and pitch independently.

Record from your microphone and download the file.

Pull the soundtrack out of any video file.

Test tones, a tuner and a metronome.

Edit title, artist, album and cover art.

A ten-band equaliser with presets, for any audio file.

Cut the silent gaps out of a recording automatically.

Play a sound, or part of one, backwards.

Make a voice deeper, higher, robotic or tinny.

Cancel the centred vocal in a stereo song.

Cut a song into a ringtone, faded and the right length.

A chromatic tuner that listens through your microphone.

Find the tempo of a song, from the file or by tapping.

See the frequencies in a recording, over time.

Generated noise, rain and ocean, with a timer.

A playable piano keyboard.

A 16-step sequencer with synthesised drums.

Stereo to mono, swap, extract, invert phase.

A printable picture of a recording’s waveform.

Play .mid files and see the piano roll.

Remove hiss, hum and fan noise from audio.

Accurate metronome with tap tempo and subdivisions.

Notes in any chord or scale, with piano, fretboard and transposing.

Mix several audio files together, with the music ducking under the voice.

Delay and reverb times in milliseconds for any tempo.

Tap along to a song and export a synced .lrc lyrics file.

Measure the offset between two recordings and line them up.

Measure LUFS, loudness range and true peak against delivery targets.

Cut a long recording into separate, named tracks.

Every highlight and note out of a PDF, with the words underneath.

Create ZIP archives or extract them.

Break a large file into parts and put it back together.

Rename many files at once with patterns and numbering.

Find identical files in a folder by content, not name.

Work out what a file really is from its contents.

Fix mojibake — convert between UTF-8, UTF-16 and legacy encodings.

See any file as hex and text, byte by byte.

Convert any file to Base64 text and back.

Combine many text files into one.

Turn a folder into a text diagram for a readme.

Open tar, tar.gz and gz archives.

Convert between TTF, OTF and WOFF, and read font details.

Preview a font file with your own text before installing it.

See what is taking up space in a folder.

Read .epub ebooks.

Open .docx files.

Codec, bitrate and resolution of a media file.

Open .eml and .mbox email files and save the attachments.

See what is different between two folders.

Build an EPUB ebook from your own chapters.

Find and replace text in every file in a folder.

Pack a page and its folder into one .html file.

Find filenames that will break on another system.

Plan which files go on which disc, stick or card.

Build a clear payslip with earnings, deductions and net pay in words.

Make one rent receipt or a whole year of them in a single pass.

23 standard HR documents — offer to full and final settlement — from one set of fields.

Turn receipts and mileage into a claim form your finance team will accept.

Raise a numbered purchase order with line items, tax and approval.

A packing slip that shows what shipped, and deliberately no prices.

Run an imprest float with a running balance and a reconciliation.

Design a stamp card and print a whole sheet of them with cut marks.

Folded name cards for every guest, printed from a list in one go.

A real quote: expiry date, optional extras, deposit and a private margin view.

Design one card, load a CSV and a photo ZIP, get the whole batch.

A full canvas editor with 424 templates and 71 decorative shapes for thumbnails, covers, cards and posters.

Drag-and-drop flowcharts, org charts and system diagrams with connectors that stay attached.

QR codes for links, WiFi, contacts and plain text.

Scan a code with your camera or from an image.

EAN, UPC, Code 128 and more, ready to print.

Build an invoice and export it.

Fill in a clean CV template and export it.

Draw or type a signature and save it with a clear background.

Printable calendars, planners and graph paper.

Write a flowchart in text and export the picture.

Design and print business cards at the exact size.

Staff, student and visitor badges with a photo.

Printable certificates, singly or a batch from a list.

Company letterhead with your logo, ready to print.

Print address and product labels on standard sheets.

Build a colour palette with harmonies and contrast checks.

Try heading and body typefaces together on real text.

Soft multi-colour gradient backgrounds as CSS.

Graph, dot, lined, isometric and music paper to print.

Turn a photo into a printable colouring page.

Printable menus with sections, prices and dietary marks.

Printable recipe cards with scaling and proper layout.

Numbered event tickets, cloakroom books and gift vouchers.

Turn an indented outline into a mind map.

Tasks and dates in, a Gantt chart or timeline out.

Video thumbnails at the right size, readable when small.

Initials avatars and identicons from names.

Signatures that render in real email clients.

Printable card grids for classroom and party games, numbers or your own words.

Printable flashcards plus a study mode.

Printable word searches and scrambles.

Printable arithmetic practice and answers.

Labelled Venn diagrams as PNG or SVG.

An indented outline becomes a drawn family tree.

Buttons, stickers and badges, with the CSS to match.

Create 1200×630 social link preview images.

Printable storyboard frames with a shot list.

Spine width from the page count, and a full wrap template.

Arrange furniture at real size and check the walkways.

Cutting list, fabric quantities and binding from a block layout.

Printable folding templates for boxes, bags and sleeves.

A whole type scale with line heights that land on a grid.

Print addresses onto DL, C5, C6 and No.10 envelopes.

Printable bunting flags at true size, one letter each.

Lay out frames and get the nail measurements for each.

Pack images onto a sticker sheet with a matching cut file.

Proofread, summarise and pull out the key points.

Remove or replace a background, blur, enlarge, describe, read text, keywords, duplicates.

Type a description and get pictures painted by AI.

Read text out of a photo or screenshot.

Check every key on your keyboard is working, including modifiers.

See and hear whether your microphone is picking you up.

Check your camera works, and see its resolution and frame rate.

Full-screen colours to find dead or stuck pixels on a monitor.

Your screen resolution, pixel ratio, colour depth and refresh rate.

What browser you are running, and what it supports.

Measure your words per minute and accuracy.

Check every part of a touchscreen responds, including multi-touch.

Test mouse buttons, double clicks, scrolling and polling rate.

Test a gamepad: buttons, sticks, triggers and vibration.

Measure your real refresh rate and spot dropped frames.

Find the highest frequency you can hear.

Test speaker channels, balance and frequency response.

Check colour vision and simulate colour blindness.

Charge level, charging state and measured drain rate.

Test a phone accelerometer, gyroscope and compass.

Measure processor, memory and graphics performance.

A calibrated on-screen ruler in cm and inches.

Bubble level, inclinometer and compass.

Test patterns for checking a display.

A full screen of any colour.

Live decibel readings from the microphone.

Time from click or keypress to the painted frame.

A diagnostic page for checking alignment, colour, banding and scale.

See every message from a MIDI keyboard or controller, live.

A vision self-check scaled to your real screen and distance.

Measure the real round-trip audio delay through your speakers and mic.