Zero-drift running cadence metronome

Driftless

A high-precision cadence companion with consistent timing across iOS, Android, and the web.

01

The problem

Long-running timers accumulate drift, while interruptions and platform audio differences break cadence.

02

Approach

Drive every beat from a sample clock and look-ahead scheduler, wrapped in a shared cross-platform training flow.

03

Key engineering decisions

AVAudioEngine on iOS and AudioTrack on Android
AudioContext look-ahead scheduling on the web
BPM changes take effect at the next beat boundary

04

Boundaries and limitations

The native iOS build still requires an Apple Team ID
Live Activities, foreground service, keep-awake, and volume buttons remain native follow-up work