Fartlek Interval Trainer

Timer: Intervals, HIIT, Tabata

Free · In-App Purchases · Designed for iPhone. Not verified for macOS.

Auto-detect interval training for runners. More than just a timer. Run faster and train smarter with the original Fartlek auto-detect interval training app. Built by runners for runners. For both Apple Watch and iPhone. Train with classic intervals, HIIT, Tabata and Fartlek in one powerful running app. More than just a simple timer. Switch to Fartlek mode and let FiT detect your speed, automatically converting your run into structured intervals. No reaching for your device. No pressing buttons. Just automatic recording of your activity. FiT displays your progress live, with colour-coded feedback showing how hard you’re running and when you’re recovering. The beautiful Dual Progress Ring shows progress for the current interval and the overall workout, keeping you motivated throughout. Analyse every interval with detailed pace, heart rate, cadence and distance metrics. Share your runs with friends with full syncing to Strava and Apple Health. Key features: Auto-detection of spontaneous intervals in Fartlek mode Live colour-coded effort feedback Powerful interval timer for structured workouts Detailed interval metrics and analysis Integrated with Strava and Apple Health NEW! Advanced effort levels automatically detect sprint, hard, moderate and easy effort during your run. Run free. Train smart. Let the app do the rest. Happy fartlekking! Subscription Terms FiT offers an optional auto-renewable subscription. Payment will be charged to your Apple ID account at confirmation of purchase. The subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period. You can manage or cancel your subscription at any time in your Apple ID account settings. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.iubenda.com/privacy-policy/39192677
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Version 2.5 introduces workout analysis charts, with new visualisations showing your target and actual performance for each interval. Improved workout summaries provide cleaner, more informative workout reviews with key metrics highlighted. Additional bug fixes and improvements enhance performance and reliability.

The developer, Richard English, 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.

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

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

    Provider
    • Richard English
    Size
    • 71.5 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.
    • Apple Watch
      Requires watchOS 10.6 or later.
    Location
    • This app may use your location even when it is not open, which can decrease device battery life.
    Languages
    • English
    Age Rating
    4+
    In-App Purchases
    Yes
    • Annual USD 6.99
    • Monthly USD 0.99
    • Lifetime USD 14.99
    • RemoveAds USD 0.99
    Copyright
    • © 2026 Richard English