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CoreInterval & HIIT timer · iPhone

Work. Rest.
Repeat the round.

An interval timer for HIIT, Tabata, circuits and boxing — big, clear and easy to follow mid-workout.

Download Core on the App Store

Free to download on iPhone

Core counting down a work interval, set 1 of 8

Why Core

Set it once. Just train.

Set work (time or reps), rest and sets. Save it, start it any time.

My Workouts in Core: saved workouts with work, rest and sets, including a Tabata and a reps-based workout
Core rest interval in blue with the next work interval shown below

Work and rest

Push or breathe — at a glance.

Red for work, blue for rest, with audio cues for every switch.

History & trends

See the work add up.

Every session in your history, with weekly trends.

Core workout history with a weekly trend chart

Core Pro

  • Unlimited timers and duplicates
  • Full workout history
  • Monthly and yearly trends
  • CSV export

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