Custom Circuits
Stack intervals with different durations and loop counts. Set repeats by count or total time. Make it yours.
Your Workout.
Your Rules.
Build custom interval circuits for HIIT, Tabata, boxing, and any training style. Voice countdown, Live Activities, and Apple Health built in.
iPhone Native
Apple Health
iCloud Sync
Built for Every Workout
Whether it's HIIT, Tabata, boxing rounds, or your own custom routine, Circuit Timer adapts to how you train.
Voice Countdown
Hear interval names announced and get a spoken countdown in the final seconds. Keep your eyes on your form, not your phone.
Live Activities
See your timer on the lock screen and Dynamic Island. Always know which interval you're in without unlocking.
Run Multiple Timers
Start several circuits at once. Great for coaching, partner workouts, or timing different exercises simultaneously.
Apple Health
Completed workouts save to Apple Health automatically. Track your HIIT sessions alongside all your other fitness data.
Share & Siri
Share circuits with friends as files. Start your favorite circuit with Siri or add a home screen widget for one-tap launch.
Ready-Made Circuits
Get started immediately with built-in presets, or build your own from scratch.
🥊
Boxing
12 rounds, 3 min fight, 1 min rest
⚡
HIIT
8 rounds, 40s work, 20s rest
🔥
Tabata
8 rounds, 20s work, 10s rest
⚙️
Custom
Any intervals, any loops, your way
Free to Start. Unlock Everything.
Create and run a circuit for free. When you're ready for more, unlock with a single purchase. No subscriptions.
Free
$0
get started
- 1 circuit
- Alarms and haptics
- Voice countdown
- Workout history
- Live Activities
Core
$2.99
one-time, yours forever
- Everything in Free
- Unlimited circuits
- iCloud sync
- Apple Health
- Share circuits
Ready to Train Smarter?
Download Circuit Timer from the App Store and start your first workout in seconds.