Tech
1,683 interactive pages · most loved first · page 47 of 71· Tonble one of these
PyKidos
A browser-based Python playground for children where short programs draw emoji and colors, saved locally with no account…
PyRun
A free browser-based Python IDE powered by WebAssembly that runs entirely offline, with numpy, pandas, and matplotlib an…
Python Tutor
A free tool that visualizes code execution step by step, drawing variables and data structures as you run Python, JavaSc…
QArt Coder
A generator that turns an image into a working QR code, bending the pixels so the code scans normally while still lookin…
Q-Learning 3D
A 3D WebGL simulation where a robot agent learns to navigate using Q-learning, so you can watch reinforcement learning i…
QR Code Generator
A free, lightweight QR code generator that turns links or text into a scannable code right in the browser, with no signu…
QR is cool
An interactive demo of QR code error correction: pick or scan a code, then scribble on it or cover parts and see it stil…
QR Picture
A generator that turns a photo into a scannable, high-definition QR code by controlling pixel placement, so the code kee…
qrsticks
A QR code built entirely out of tiny stick figures that still scans on your phone, with a short explanation of why decod…
Quality News
An alternative ranking of Hacker News stories that experiments with a fairer algorithm for surfacing quality posts inste…
Qualys SSL Server Test
A free deep-dive scanner that grades any public website's SSL/TLS configuration and flags outdated protocols or certific…
Quantum Canvas
An interactive 3D visualization of a qubit with real-time noise simulation, showing how errors disturb the state of a qu…
Quantum Coin
Flip a coin whose outcome comes from real quantum randomness generated on IBM quantum computers, a small hands-on demo o…
quickimagekit.com
Interactive
Quick Image Kit
A browser-based image compressor with a quality slider and instant size comparison, plus resize, convert, crop and favic…
QuicklyPDF
Free PDF tools that merge, split, and convert files entirely in your browser, with no uploads or servers so documents st…
QWERTY Jam
A playful experiment that turns your computer keyboard into a piano, so every key you press plays a note you can jam alo…
Racketmeter
A web tool that measures badminton racket string tension from the sound of a plucked string, using the microphone on you…
Rad Type
A small project that asks whether typing on a gamepad can be made fast, offering an alternative to the slow on-screen ke…
Raft: Understandable Distributed Consensus
A step-by-step animated visualization of the Raft algorithm in which you watch servers elect leaders and replicate data,…
RaidPlan
A visual raid boss planner where you draw and share strategies for World of Warcraft, Final Fantasy XIV, Lost Ark and Ne…
RailRadar
A live GPS map showing every Indian Railways train as it moves, with real-time positions, speeds, delays, and running st…
Rallly
An open-source, privacy-focused alternative to Doodle for creating group meeting polls, where participants vote on times…
Random
An ever-expanding series of small visual experiments by Vasilis van Gemert exploring what random numbers look like, from…
Random Hacker News Front Page
A button that drops you on the Hacker News front page from a random day in its history, a quick way to see what the tech…
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