Chord Trainer
Chord Trainer measures how fast your hand finds the next chord — making visible what practice otherwise leaves to gut feeling.
Challenge
Chord changes are practised blind. You feel that something is slowing you down, but not which transition it is — or whether four weeks of practice actually changed anything.
Approach
Every change is timed to the millisecond, via MIDI over USB or Bluetooth, or through the microphone on an acoustic piano. The app builds adaptive sessions from your practice history, and chords are picked on the circle of fifths rather than from menus.
Outcome
A native app for macOS, iOS and iPadOS: daily challenges drawn from your own weakest transitions, a statistics dashboard with BPM history, ear training for intervals and chord types, and iCloud sync across devices.