Everything in the catalog

Typing test that times each hand separately to show whether the left or right hand is faster.

Simulates Warhammer 40,000 attack dice and shows hit, wound and save probabilities as charts.

Neural-network based Rubik's cube solver that finds short solutions from scrambles you enter.

Typing speed test with mechanical keyboard sounds and live stats as you type.

Strip HTML tags, encode or decode entities, format HTML and compare two code snippets in a diff viewer.

A web application for generating invoices, built using React.

Text analyzer, word counter and case converter built as an open source web app.

Makes a QR code card that lets guests join a WiFi network without typing the password.

A monster stat block builder for 5th edition Dungeons and Dragons

Create and manage invoices in browser, print to PDF

Monkeytype-style typing test where you type real code snippets to measure programming speed.

Learn to play drums with a collection of popular grooves shown in groove notation with playback.

Interactive web app for ear training that plays tones and checks your answers.

A gallery of browser bookmarklets that automate tasks on web pages, which you can add to your bookmarks bar.

Block and JavaScript editor for micro:bit programs with an on-screen simulator.

Exchange rate converter covering 32 currencies.

Open source tool that writes alt text for an uploaded image.

Works out which trades rebalance a portfolio while limiting taxes.

Open source web app that stands in for a password manager without storing your passwords.

Client-side generator for passwords, API keys, UUIDs, JWT secrets and encryption keys.

All-in-one site with 21 calculators and tools, including math, finance, graphing, conversion, password and QR.

WaqtX is a modern web app that transforms your life timeline into meaningful insights by combining personal time data, Islamic history, and daily reflection…

A toolbox site with hundreds of free, open-source web tools for developers, creators and everyday tasks.

A toolbox of 92 free browser-based tools for PDF, image, video, audio and text work.