About

This pitch pipe was designed as a bit of an experiment into making just intonation intervals easily available in an app: for more information, read the blog post. It works offline, and to add it to your homescreen select the share menu in your phone browser, then "Add to Home Screen".

A few notes on how to use it:

• It is designed for phones in portrait orientation.
• The outer ring of notes are always equal temperament, with A4 at 440 Hz.
• The inner rings are a small selection of just-intonation intervals, relative to the tonal centre.
• The very outer ring rotates, changing the tonal centre.
• To play a chord on a phone, hold down multiple notes at once.
• To play a chord on a computer, hold the shift key while clicking notes.