IntervalForge — Interval Timer
No Subscription Workout Timer
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
No subscription. Buy once. Interval timer for HIIT, strength training & Tabata with Live Activity on your Lock Screen. 3 built-in presets to get you started instantly.
72-point digits you can read from across the gym. Live Activity countdown right on your Lock Screen. Pay once, use forever — no subscriptions.
READY-MADE PRESETS
Three built-in templates to get you started instantly: Tabata Classic (20s/10s × 8 sets), HIIT 30/15 (3 sets with 60s rest), and Circuit 3-Exercise (4 sets with 90s rest).
BIG NUMBERS FOR THE GYM
72-point digits you can read from a distance. The entire screen turns red during work and green during rest — a quick glance tells you exactly where you are.
LIVE ACTIVITY
See your countdown on the Lock Screen and Dynamic Island in real time. No need to open the app to check your remaining time. Live Activity is available for free.
BACKGROUND TIMER
Lock your screen, switch apps, play music — the timer keeps running. Notifications alert you at every interval change.
FULLY CUSTOMIZABLE
Set work and rest durations, number of sets, and rest between sets. Add a name, icon, and color to each workout.
BUY ONCE, USE FOREVER
No monthly fees. The Pro upgrade ($2.99) is a one-time purchase that unlocks unlimited workout saves and preset editing. Free users get 3 presets plus 1 custom workout.
FEATURES
- Buy once — no subscriptions
- 72pt large display
- Live Activity & Dynamic Island (free)
- Full-screen color indicators (red = work, green = rest)
- 3-second countdown alerts
- Haptic feedback
- Background operation
- 3 preset templates
- Workout history
- Screen sleep prevention
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Minor improvements.
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
- 1.1 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 Japanese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- IntervalForge Pro $2.99
- Copyright
- © 2026 Shuto Nishiyama