Documentation

App Guides

How to use every app we make. Each guide covers what the app does, every control it has, and how to work with it — written against the build the app is actually running.

Keep time

Read and build notation

Train your hands

Learn the instruments

What every app has in common

Help and feedback

Tell us the app name, the build shown in its footer, the page URL, your browser, what you expected and what happened. Most apps have a Copy details button that collects it for you.