Browse 1,306 websites

Run a coffee stand for fourteen days, adjusting recipe and price daily, and learn more about margins than from any lecture.

The murmur of a café without the queue or the cost, built on research that moderate background noise helps creative work.

A plain, ad-free bank of cognitive tests — n-back, digit span, Stroop, mental rotation — that keeps a history of your scores.

Settlers of Catan in a browser tab, complete with the trade negotiations and the one player who will not give you wheat.

Match hue, saturation and complementary colours against a target, one exercise at a time, scored out of a hundred.

Hand-picked four-colour palettes posted daily and sorted by mood, with none of a generator's randomness.

Palette generator trained on photographs and films, so the colours it suggests look like they came from somewhere real.

Team deathmatch with a built-in level editor, played mostly by people who memorised every map years ago.

Petabytes of crawled web pages released free for anyone to analyse. Most of the language models you have used started here.

Interactive models of what complexity science likes best — epidemics, flocking, synchronisation, forest fires.

Records a page as you browse it, capturing the parts a crawler cannot — logged-in views, video, anything behind a click.

Sixteen words, four hidden groups, four mistakes allowed. The traps are the entire point and they are very carefully set.

Risk on hundreds of user-drawn maps, played slowly against a community that has been arguing about dice odds since 2006.

An audio museum of sounds made by objects that no longer exist — dial tones, shutter clicks, the whirr of a rewinding tape.

Home consoles from the Atari era onward, running in the browser. Mostly worse than you remember, which is part of the appeal.

Guess the secret word and be told only how semantically close you got. Rank 4,000 feels like progress, and it very much is not.

Home of Conway's Game of Life — pattern archive, wiki and a board for setting your own cells running.

Click the cookie, buy grandmas, buy portals, accidentally summon something. The game that turned incrementals into a genre.

Recipes laid out as a table of operations instead of prose, so you can see at a glance what combines with what and when.

Generates hero images — gradients, particles, triangles, topography — at whatever resolution you need, free to download.

The site every school network forgot to block, still hosting Run 3, Fireboy and Watergirl and almost no actual mathematics.

Chrome, flames and bevelled gradients — the 2003 logo generator, still online and still producing exactly that.

Hit the space bar for a five-colour palette, lock the ones you like, hit it again. The whole tool is that loop.

Nest and feeder cams run by the Cornell Lab, with ornithologists in the chat explaining what the bird is doing and why it matters.

One button that adds unicorns and rainbows to any web page, solving a problem that has never once been reported.

Upload any file and receive a genuinely corrupted version back. Built for missing deadlines, used mostly for art.

The same premise with different flavours of damage — choose the format and how thoroughly you want it ruined.

The EFF's test showing how uniquely identifiable your browser is from fonts, plugins and screen size alone. Most people are one in millions.

Blind items published daily since 2006, unverifiable by design, and treated as scripture by a very large comment section.

The biggest browser arcade going, with genuinely decent HTML5 ports and a search that mostly finds the game you meant.

A few hundred browser escape rooms in one filtered shelf, all running in the tab with nothing to install and nothing to buy.

The entire tower defence shelf in one place, sorted by how many people are currently playing, none of it requiring an account.

The tidied-up archive of internet horror folklore, from Slender Man to the stories a school friend swore blind were true.

Reader-submitted horror stories with narrated versions, sorted so you can pick your poison: rituals, dolls, or something in the loft.

Scores films for you by finding users whose past ratings track yours, then weighting their opinions. Recommendation with the maths shown.

Translates a cron expression into plain English as you type it, then tells you when it will next fire. Ends a very specific argument.

Wordle in reverse: you are handed the green and yellow clues and have to reconstruct the guesses that could have produced them.

Frogger with better manners: hop a chicken across roads, rivers and railway lines until the inevitable lorry.

An explorable on how ideas and riots spread through a social network, with the contagion thresholds under your control.

Where every cruise ship in the world currently is, with deck plans and itineraries attached, for reasons entirely your own.

Chain encoders and classical ciphers together and watch text transform between formats at each step.

Builds a gradient visually and hands over the CSS, including the awkward multi-stop and radial cases.

Recreate a target image in as few characters of CSS as possible, then watch somebody do it in half as many.

Sugar-coated filler text for wireframes, with sliders for exactly how sweet and how long the nonsense should be.

The volunteer-edited web directory that outlived DMOZ, still organising the internet into a category tree by hand.

Tower defence from the villain's side, defending your gems from heroes using demons, orcs and the undead.

Crude four-panel strips with a mean streak, running since 2005 and still finding fresh ways to end badly.

GCHQ's cyber swiss army knife: chain base64, XOR, hashes and regex into a recipe and watch the data transform at every step.