const sites = await fetchSites({ live: true })sites.filter(isLive).map(renderCard)await kv.put(`votes:${key}:up`, String(next))export default function Home() { ... }npm run validate:content && npm run typecheckgit commit -m "ship it" && git pushif (prefersReducedMotion) return nullcurl -s https://base31.org/sitemap.xml | headaddEventListener("push", (event) => show(event))serve(public/sites/example/index.html)
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Cool apps
Free web apps worth a bookmark — everything here runs in a tab, with no install and no account just to try it.
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39 apps
Carbon↗carbon.now.shTurn a snippet into a clean, shareable image with window chrome, padding and a theme — the standard way to post code.Added · Not yet reviewed
Cleanup.pictures↗cleanup.picturesPaint over anything you want gone from a photo — a stranger, a wire, a watermark — and the space is filled in.Added · Not yet reviewed
CloudConvert↗cloudconvert.comConvert between more than two hundred file formats — documents, images, audio, video and archives — and hand back a link.Added · Not yet reviewed
CodePen↗codepen.ioWrite HTML, CSS and JavaScript in three panes and watch the result update live — the front-end playground everyone shares.Added · Not yet reviewed
Coolors↗coolors.coGenerate colour palettes with the spacebar, then check contrast and export them as CSS, SVG or a share link.Added · Not yet reviewed
CyberChef↗gchq.github.ioThe self-styled cyber Swiss army knife: base64, hashing, ciphers and dozens of other transforms, chained into recipes.Added · Not yet reviewed
dbdiagram.io↗dbdiagram.ioSketch a database schema in a small DSL and watch it become a clean entity-relationship diagram you can export.Added · Not yet reviewed
Desmos↗desmos.comA graphing calculator that plots equations as you type them, with sliders to watch a curve respond in real time.Added · Not yet reviewed
Excalidraw↗excalidraw.comA hand-drawn-style whiteboard in the browser for diagrams and quick sketches, with live collaboration and no sign-up.Added · Not yet reviewed
GeoGebra↗geogebra.orgInteractive geometry, algebra and calculus tools that started as classroom software and stayed free for everyone.Added · Not yet reviewed
Google Fonts↗fonts.google.comThousands of open-source typefaces to preview, pair and download, with the CSS to drop any of them onto a page.Added · Not yet reviewed
Hemingway Editor↗hemingwayapp.comPaste in prose and it flags the long sentences and passive voice, grading the writing on how easy it is to read.Added · Not yet reviewed