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.
Siri & Widgets
Start your favorite circuit with Siri or add a home screen widget for one-tap launch.
Interactive Timeline
See your whole circuit at a glance. Tap any interval to jump to it, or swipe to navigate forward and back.
Apple Watch
Run circuits from your wrist with haptic alerts, alarms, and full workout tracking. No phone needed.
Navigate Your Workout Visually
The interactive timeline puts your entire circuit in front of you. Always know where you are, what's next, and how far you've come.
Round 2 of 6
Tap to Jump
Tap any segment to skip straight to that interval. No hunting through menus.
Swipe to Navigate
Swipe left or right to move between intervals. The timeline scrolls to keep you centered.
Track Your Rounds
For multi-round circuits, the round counter shows exactly where you are in the workout.
Build Any Timer
Add intervals, set loops, and go. Whatever your workout, Circuit Timer adapts to it.
🥊
Boxing Rounds
3-minute rounds with rest between. Set 12 rounds and go.
⚡
HIIT & Tabata
Fast work, short rest, repeat. Classic interval training.
🧘
Stretching
Hold each pose for a set time. Voice announces the next one.
🏋️
Strength Sets
Timed rest between sets. Never lose track of your recovery.
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
Most Popular
Core
$2.99
one-time, yours forever
- Everything in Free
- Unlimited circuits
- iCloud sync
- Apple Health
Pro
$4.99
one-time, yours forever
- Everything in Core
- Apple Watch app
- Wrist haptics & alarms
- watchOS workout tracking
Ready to Train Smarter?
Download Circuit Timer from the App Store and start your first workout in seconds.