An iPhone + Apple Watch app

Watt Intervals

Build precise indoor-cycling workouts, control a compatible Bluetooth FTMS smart trainer in ERG mode, and follow power, cadence, and heart rate without creating an account.

Focused trainer control

Run structured ERG workouts, see what is coming, and adjust the target in exact watt increments.

Apple Watch heart rate

Start heart-rate collection with the ride and keep a live view beside trainer telemetry.

Private by design

Workout plans and ride telemetry stay on your devices. There is no account, advertising, or analytics SDK.

Your ride history

Save rich local samples, repeat a prior workout, and optionally write completed rides to Apple Health.

Watt Intervals is an independent product from Trusty Genius LLC. It is not affiliated with or endorsed by any smart-trainer manufacturer.