Education
1,350 interactive pages · most loved first · page 40 of 57· Tonble one of these
RAWGraphs
A free, open-source tool for turning spreadsheet data into custom interactive charts without writing code, with a galler…
Rawl
A visual music theory tool that draws chords as colored flags, showing the harmony of top composers from MuseScore score…
Ray Optics Simulation
An interactive physics simulation of light reflecting and refracting through mirrors and lenses, letting you place eleme…
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…
Read Shit Faster
A speed-reading web tool that presents text at a pace you control, built to help you get through articles and passages n…
Read the Places
A literary atlas mapping the real places mentioned in hundreds of novels, ordered as each story visits them, so you can…
Reading Length
A book calculator that looks up any title's word count and, from your reading speed in words per minute, tells you how l…
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…
Readlang
A language learning tool that translates words as you click them while reading web pages and books, then turns them into…
ReadNext
A book recommender that takes a title you liked and returns suggestions built from about six million ratings by 53,000 r…
Readow
A book recommendation tool where you type in titles you love and an AI suggests what to read next, offering a quick way…
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…
ReadWriteThink
A free educational resource offering interactive tools, lesson plans, and student writing activities that make reading a…
Real Country Sizes
An interactive map that lets you drag any country across the globe to reveal how badly the standard Mercator projection…
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…
Real-Time Wave Tracing
An interactive wave simulation that traces how waves spread and bounce in real time, a hands-on way to watch wave physic…
Recommend Me a Book
A book discovery site that shows the first pages of random novels with author and title hidden, so you judge the writing…
Red Blob Games
Amit Patel's interactive tutorials on game programming topics like pathfinding, hexagonal grids, and procedural map gene…
Redis City
An interactive 3D model of one Redis instance that lets you explore the command path, data structures, allocator, OS mem…
Reelear
A set of free web apps for ear training that generate melody, arpeggio, and harmony dictation exercises without abstract…
RefSeek
An academic search engine for students and researchers that pulls results from web pages, books, encyclopedias and journ…
Regex Learn
A free interactive course that teaches regular expressions step by step, with live exercises, a cheatsheet and a playgro…
RegexOne
Interactive lessons that teach regular expressions step by step with instant pattern-matching feedback right in the brow…
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