Feels like magic

Drag one slider from quantum foam to the cosmic web, with every object in between labelled at its true size.

Rough sketch in, finished image out, with the result following your actual lines rather than politely ignoring them.

Converts your scrolling into real distance and tells you what you have just passed — a giraffe, the Eiffel Tower, low Earth orbit.

The original semantic-distance guessing game, noticeably harder than its descendants and considerably more humbling.

Word association against a neural net: type anything related to the highlighted block and it clears. Built by Google's research team.

Raw Sentinel and Landsat imagery for anywhere on the planet, free, with band combinations that reveal crops, floods and old burn scars.

Short visual explanations of statistics ideas — eigenvectors, conditional probability, Markov chains — all draggable.

Thousands of full-screen graphics experiments, each one a few hundred lines of maths you can read and edit live.

Drag the control points of a letter back into shape. Your score is how far off the real typeface you landed.

Random design briefs with a countdown attached, for when the problem is not skill but having nothing to work on.

A full year of merchant shipping movements animated on one dark globe and split by cargo type, which turns global trade into a visible swarm.

The Hacker News lane where people post things they built themselves: odd side projects, tiny tools and a frank comment thread under each one.

A live feed of OpenStreetMap edits as they happen, zooming to each contributor's patch of the world one small correction at a time.

Doom compiled to WebAssembly and running at full speed in a tab, which is either nostalgia or a small engineering miracle.

Forty logic puzzles on one page, each generated fresh and each solvable by pure reasoning. The interface is ancient and it does not matter.

Enter any two articles and get every shortest path of links between them, drawn as a graph you can drag.

An infinite canvas for rough diagrams and flows. Opens instantly with nothing to configure and no file to save first.

Full paint program in a tab — brushes, layers, filters and a stamp library — with nothing to install and nothing to pay.

Roll a ball down an endless neon slope at rising speed until the geometry wins, which it always eventually does.

An endless sheet of virtual bubble wrap that pops under the cursor and quietly refills itself behind you.

Push crates into place in rooms built to punish the obvious first move, with thousands of community-made levels behind them.

Grid sequencer with a marimba and a drum kit, tuned so that anything you tap sounds passable, then shared as a link.

Ride a lift from the ground to geostationary orbit, passing every layer of atmosphere and satellite on the way.

Extrudes type into three dimensions, wraps it round shapes and lets it drift, exporting the result as a loop.

A hundred billion dollars and a shopping list running from Big Macs to aircraft carriers, and it is harder to spend than you expect.

Paste any text and it flashes one word at a time at a speed you pick, which is either speed reading or a mild trance.

Tilemap editor for small games — paint a level from a tileset, then export it straight into Godot or Unity.

Everyone knows the location except the spy, who has to bluff through the questioning without ever revealing they have no idea.

Compare image codecs side by side with a draggable split, and see precisely what each quality setting costs you.

Wiggle the mouse and a black worm follows; wiggle harder and it strobes violently, so treat the epilepsy warning seriously.

Swing a stick figure between grapple points using one button, then trust momentum to carry the mistake.

An idle game that keeps buying you more stimulation until the page is a lo-fi stream, a podcast and a fidget spinner at once.

Drop fruit into a box, merge matching pairs and watch the pile creep towards the line. Physics does the rest of the work.

Tick off what is genuinely in your cupboards and it ranks the recipes you can make right now, with nothing missing.

The seven-day jam build where time only moves when you do, still free in the browser and still one of the decade's best ideas.

Breed meat, then drones, then queens, then things with far too many legs. The exponential curve is the entire narrative.

Ascending through increasingly abstract mathematics, with a community that treats optimising it as a competitive spreadsheet sport.

Board games rendered as physical objects on a 3D table with no rules enforcement, so you can still play badly like at home.

World atlas of traditional dishes and the specific places that still make them properly. Endless, and reliably makes you hungry.

Name something you liked and it returns things with the same texture, spanning films, books, music and games at once.

Graded summaries of the terms you agreed to without reading, with the specific alarming clause quoted. Volunteer-run since 2012.

Type a word, pick from several hundred FIGlet fonts, and get the enormous ASCII banner your terminal deserves.

Converts an uploaded photograph into ASCII, HTML or coloured text art, with the character density under your control.

Canadian satire that assumes you follow Canadian politics, and rewards you handsomely if you happen to.

Australia's oldest newspaper, filed from a town with no remaining population, covering the nation with dead-eyed accuracy.

Teaches the pen tool by making you trace shapes with the fewest possible anchor points. Level nine is genuinely cruel.

Combine shapes with union, subtract and intersect to hit a target silhouette in as few operations as you can manage.

Every component you might need to build, with links to how twenty different design systems each named and handled it.