typing.io
Type real open source code to master the symbols programmers use
You type through real open source code, key by key. The lessons cover 16 languages, including JavaScript, Ruby, C, C++, Java, PHP, Haskell and Scala. The engine stops you from typing far past an error, so you fix mistakes as you go.
Freemium · Login needed · Browser · Beginner
About typing.io
It trains the symbol-heavy key sequences that show up in real code. It suits programmers who type prose well but slow down on brackets and operators. After a lesson you see an analysis of how much your typos cost you.
It runs in the browser. You can try a demo without an account, but the free plan needs a sign-in. A paid Mechanical plan adds uploading your own code, a typo heatmap, a fingering guide for symbol keys and progress tracking.
On Breakpoint since 23 Oct 2026.