IntervalForge: HIIT & Tabata
Gym Workout, No Subscription
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
NEW: one-tap rest timer between sets, plus Siri & Control Center. Giant 72pt timer, Lock Screen countdown, and no subscription — pay once, keep it forever.
Giant 72pt digits you can read from across the gym. Live countdown on your Lock Screen and Dynamic Island. Pay once, keep it forever — no subscription.
Built for HIIT, Tabata, circuits and strength training. The whole screen turns red for work and green for rest, so one glance tells you what to do next.
READY IN ONE TAP
Three presets are included: Tabata (20s/10s × 8), HIIT 30/15 and a 3-exercise Circuit. Pick one and go.
QUICK REST TIMER FOR LIFTING — NEW
Between sets, one tap starts a 60, 90, 120 or 180-second rest. No setup needed.
SIRI, SHORTCUTS & CONTROL CENTER — NEW
Start a workout or a rest timer with Siri, a Shortcut or a Control Center button. The new Home Screen widget quick-starts your favorite workouts or a rest timer.
LOCK SCREEN & DYNAMIC ISLAND
Live Activity shows the running countdown without opening the app — free for everyone.
KEEPS RUNNING IN THE BACKGROUND
Lock your phone or switch apps: the timer keeps going and notifications mark every interval change. Your music is lowered, not stopped.
BUILD YOUR OWN WORKOUT
Set work and rest times, sets, rest between sets and an exercise name for each interval. Total time remaining is always on screen. Workout history and a weekly summary keep you consistent.
PRO — ONE-TIME PURCHASE
No monthly fees, ever. Pro is a single purchase that unlocks:
- Unlimited custom workouts
- Editable presets
- Voice guidance: hear each exercise, set and a 10-second warning without looking at your phone (NEW)
The free version includes all 3 presets and 1 custom workout.
FEATURES
- No subscription — buy Pro once
- 72pt full-screen display, color-coded work/rest
- Live Activity on Lock Screen & Dynamic Island (free)
- Quick rest timer: 60/90/120/180s (free)
- Siri, Shortcuts & Control Center (free)
- Home Screen widget: quick-start favorites or a rest timer (free)
- Reliable background timer with notifications
- Plays nicely with your music
- 3-second countdown and haptics
- Exercise names per interval
- Workout history & weekly summary
- Screen stays awake during workouts
Questions or ideas? Leave a review or contact us from the support page.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Version 1.1.0 is a big update:
- Quick rest timer: one tap for 60/90/120/180s between sets
- Siri, Shortcuts & Control Center: start a workout or rest timer instantly
- Home Screen widget (free): quick-start favorite workouts or a rest timer
- Voice guidance (Pro): hear each exercise, set and a 10-second warning without looking at your phone
- Exercise names per interval and total time remaining on screen
Still no subscription. Enjoy your training!
The developer, Shuto Nishiyama, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Shuto Nishiyama
- Size
- 2 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - Mac
Requires macOS 26.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.0 or later.
- iPhone
- Languages
English and 10 more
- English, Dutch, French, German, Italian, Japanese, Korean, Portuguese, Simplified Chinese, Spanish, Traditional Chinese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- IntervalForge Pro $2.99
- Copyright
- © 2026 Shuto Nishiyama