VO2Flow HIIT Timer

Easy Interval Trainer w/ Music

Free · In‑App Purchases · Designed for iPad. Not verified for macOS.

VO2Flow is built for the Norwegian 4x4 protocol and any interval structure you want to run. Set your work, rest, and rounds. Press start. The app handles the rest. Features: - Norwegian 4x4 protocol built-in - Custom profile builder for Tabata, 10x1, 8x2, or any structure - Apple Music integration with artwork and controls during your session - Audio cues and haptic feedback on every phase transition - Live Activities on Dynamic Island and Lock Screen - Phase-based background colors for each interval stage - Workout history with monthly grouping - 7 achievement badges, shareable to social - HealthKit integration saves sessions to Apple Health - Siri and Shortcuts support - Keep screen awake during sessions Free: Norwegian 4x4 profile, 1 custom profile, ads. Pro ($6.99 once): Remove ads, unlimited profiles, workout history, badges, and every future Pro feature. No subscription.

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Small Bug Fix

Version 2.2

The developer, CHRISTOPHER DISCOTTO, 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 Used to Track You

    The following data may be used to track you across apps and websites owned by other companies:

    • Identifiers
    • Usage Data

  • Data Linked to You

    The following data may be collected and linked to your identity:

    • Usage Data

  • Data Not Linked to You

    The following data may be collected but it is not linked to your identity:

    • Purchases
    • Identifiers
    • Usage Data
    • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Accessibility

The developer has not yet indicated which accessibility features this app supports. Learn More

Information

Seller
  • Discotto Labs L.L.C.
Size
  • 25.1 MB
Category
  • Health & Fitness
Compatibility
Requires iOS 13.0 or later.
  • iPhone
    Requires iOS 13.0 or later.
  • iPad
    Requires iPadOS 13.0 or later.
  • iPod touch
    Requires iOS 13.0 or later.
  • Mac
    Requires macOS 11.0 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 1.0 or later.
Languages
  • English
Age Rating
4+
In-App Purchases
Yes
Copyright
  • © Chris Discotto 2026 Discotto
  • Developer Website
  • Privacy Policy