Tech
1,683 interactive pages · most loved first · page 41 of 71· Tonble one of these
NumPad
A web notepad with a built-in unit calculator, so you can type lines of text and math together and convert units or run…
NumWorks Graphing Calculator
A full online emulator of the NumWorks graphing calculator that lets you try every function, plot curves, and run calcul…
Obnoxious.css
A library of loud, over-the-top CSS animations with live demos you can click through, made for the strong of heart and w…
oimo.io works
A gallery of dozens of original physics toys, simulations, and interactive browser experiments built by Japanese develop…
Ok! So
A browser drawing app for sketching ideas, diagrams, and notes on a freeform canvas, built to help you express and organ…
OKAI
An interactive introduction to artificial intelligence from Brown University that uses graphics to explain core AI conce…
OKLCH Color Picker
A color picker and converter for the OKLCH color model, a perceptually uniform alternative to hex, RGB, and HSL that sui…
OKLCH Colour Space
An interactive 3D explorer for the OKLCH color space that renders the sRGB boundary as a solid, heatmap, or lightness ma…
Old Models
A playable archive of historically important image-generation models laid out on a timeline, so you can load early model…
OldWeb.today
A time machine that loads archived websites inside emulated vintage browsers like Netscape and Mosaic, recreating the 19…
One Second Code
A guessing game where you estimate how big a number must get before a short program takes one second to run, testing you…
OneLang IDE
A browser playground that translates source code from one programming language into another, so you can paste a snippet…
Online Compass
A virtual compass that shows direction in your browser, with a bubble level and speedometer built in, handy when you hav…
Online Conversion
A reference for converting just about anything to anything else, with thousands of units, millions of conversions, and c…
Online Cursor Editor
A free in-browser editor for drawing your own Windows mouse cursors, including animated ones, which you can then downloa…
Online EXIF Viewer
A browser tool that shows the EXIF data inside a photo, including camera settings, GPS location, and image metadata, pro…
Online Mic Test
A dead-simple tool that lets you test whether your microphone is working, check input levels, and diagnose audio issues…
Online Ruler
A calibrated on-screen ruler that measures real objects on any device, switching between centimeters and inches with cus…
Online Ruler
A free on-screen ruler that measures in inches, centimeters, and millimeters at actual size on a phone, tablet, or compu…
Online Ruler
An on-screen ruler and protractor that shows actual size in centimeters, millimeters, and inches on any device, for quic…
Online Sequencer
A browser-based music sequencer for composing, playing, and sharing songs on a piano-roll grid.
Online Sign
A free printable safety sign maker with hundreds of pictograms and fully customizable text and colors, for building warn…
Online Tools
A collection of more than a thousand free browser utilities for editing images, animations, and text, from converters an…
OnlineBoard
A free whiteboard you open in the browser with no login, where anyone with the link sees your drawing in real time and y…
Stumble onto more like this
One click takes you to a page you didn't know you were looking for. Rate it and the next one lands closer to your taste.
Add to Browser — it's freeWorks in Chrome, Edge and Brave. No account needed.