Tech
1,683 interactive pages · most loved first · page 48 of 71· Tonble one of these
RandomCity
A generative map where real OpenStreetMap buildings are extruded in 3D and swept by restless, random patterns of light t…
Ratatype
A touch typing tutor with lessons, practice, and a keyboarding speed test, plus a free certificate once you reach a qual…
Raverie Engine
A Unity-like game editor that runs entirely in the browser through WebAssembly, so you can build and test games without…
RAWGraphs
A free, open-source tool for turning spreadsheet data into custom interactive charts without writing code, with a galler…
RAWGraphs
A free browser app that turns pasted spreadsheet data into unusual vector charts such as alluvial diagrams, beeswarms, s…
RC-455
A retro-styled synthesizer in the browser with three oscillators, filters, distortion, reverb, an arpeggiator and even a…
Reactor Atlas
An interactive world map of nuclear power plants covering every reactor since 1954, with technical sheets, 3D plant mode…
Read a QR by Hand
An interactive walkthrough that teaches you to decode a QR code manually, step by step, with nothing but your own eyes a…
Reading QR Codes Without a Computer
An interactive explainer that teaches you to decode a QR code by hand, step by step, showing masks, format bits and erro…
ReadKinetic
A free, local-first speed reader that flashes text one word at a time, letting you import an EPUB or PDF or paste text a…
Readwok
A text reader that breaks any long text into paragraphs shown one at a time, helping you read carefully and take in a bo…
Realtime Colors
A live preview tool that lets you tweak a color palette on a mock website layout in real time to see exactly how the col…
Realtime Fascism
A tracker that scans US political reporting against Laurence W. Britt's fourteen characteristics of fascism, with matchi…
Realtime HTML Editor
A browser-based HTML editor with instant live preview, where you type markup and see the page update as you go, handy fo…
Recipe Search with Typesense
A search-as-you-type demo over two million recipes that returns results instantly as you type, showing what a fast, typo…
Rectangles
A day planner that lays your day out as 144 rectangles, each standing for ten minutes, so you can see at a glance how yo…
Recursive Drawing
A drawing tool by Toby Schachman where you build intricate recursive patterns from simple shapes, exploring a spatial st…
Red Blob Games
Amit Patel's interactive tutorials on game programming topics like pathfinding, hexagonal grids, and procedural map gene…
Redacted
A free browser tool that hides sensitive parts of an image by laying blurred, pixelated or solid black boxes over the ar…
RedditMetis
A Reddit profile analyzer that reads a user's public activity and guesses details about them, alongside stats on posting…
Redis City
An interactive 3D model of one Redis instance that lets you explore the command path, data structures, allocator, OS mem…
RedKetchup
A collection of browser-based tools for converting and editing images and animations, built in Montreal and usable witho…
Regex Learn
A free interactive course that teaches regular expressions step by step, with live exercises, a cheatsheet and a playgro…
Regex.ai
A browser tool that generates regular expressions from a plain-language description or sample text, taking some of the p…
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