Tabata & HIIT Timer - PEAKVO2
Interval Training & Endurance
Free · In-App Purchases
24 interval protocols including Norwegian 4x4, Tabata & HIIT. Build custom workouts. Color-coded timer guides every phase. Free to start.
PEAKVO2 is a VO2 max training app built around the interval protocols that actually move the needle:
Norwegian 4x4, Tabata, HIIT 30/30, and more.
Pick a workout, press start, and the app guides you through every phase: warm-up, work intervals, recovery, and cooldown.
Why VO2 max?
VO2 max is the single best predictor of cardiovascular fitness and long-term health. Improving it doesn't require guesswork, it requires the right intervals, done consistently. PEAKVO2 gives you both.
What's included:
24 science-backed interval protocols, including the Norwegian 4x4, Tabata, and HIIT 30/30
Build your own custom interval workouts
Color-coded workout timer with automatic phase transitions
Activity tracking with streak, year in review, and training minutes
Works with running, cycling, rowing, and indoor cardio
Free to start. 4 workouts are yours forever — no strings attached. Unlock all protocols, custom workouts, and full activity tracking with a subscription or one-time lifetime purchase.
Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
• New: a beautifully redesigned onboarding
• Improved: build your own programmable interval timer, name every interval and pick its icon
The developer, Cristian Serb, 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 Linked to You
The following data may be collected but it is not linked to your identity:
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Provider
- Cristian Serb
- Size
- 9.5 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later. - Apple Watch
Requires watchOS 11.0 or later.
- iPhone
- Location
- This app may use your location even when it is not open, which can decrease device battery life.
- Languages
English and 8 more
- English, French, German, Indonesian, Italian, Japanese, Portuguese, Spanish, Vietnamese
- Age Rating
9+
- 9+
- Contains
Health or Wellness Topics
- In-App Purchases
Yes
- Unlimited USD 3.99
- Unlimited USD 22.99
- Unlimited USD 11.99
- Unlimited USD 4.99
- Lifetime USD 24.99
- Unlimited USD 2.99
- Copyright
- © 2026 Cristian Serb