RoundShift: Interval Timer

Voice coach for HIIT & Tabata

Free · In-App Purchases

Exercise names in a real recorded voice, in all 10 languages - with new exercises added over time, no app update needed. Set it, flip your phone face down, and go. The interval timer you don't have to look at. RoundShift calls out every round — get ready, work, rest, half way, last round — so your eyes stay on the workout, not the screen. BUILT IN SECONDS • Tabata, HIIT, EMOM, strength presets — or design your own • Warm-up, custom intervals, unlimited rounds • Describe a workout in plain words and let RoundShift build it VOICE THAT COACHES • Real coach voices in 10 languages — or calm and hype styles • 89 exercise names spoken aloud in custom workouts • Works with the screen off, phone face down, music playing COACH MODE ON THE BIG SCREEN • AirPlay the countdown to any TV for group sessions and classes • Giant display the whole room can read APPLE WATCH + ADAPTIVE REST (PRO) • Full timer on your wrist with live heart rate • Rest that adapts: end rest early when your heart rate recovers, or extend it when you need more • Workouts logged to Apple Health with the right activity type SEE YOURSELF SHOW UP • Streaks, weekly minutes, and a calendar of every session • Home Screen widgets and quick actions NOT JUST FOR THE GYM • Box breathing and breathwork: 4-4-4-4 in seconds • Stretch and physio holds with spoken changeovers • Focus sprints for study and deep work • Anything that repeats: intervals are intervals RoundShift is free forever for running timers and built-in workouts. RoundShift Pro (one-time purchase, no subscription) unlocks saved workouts, stats, widgets, and Apple Watch.

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Your coach now speaks your language; properly. • Exercise names are announced in a real recorded voice in all 10 languages; no more robotic fallback • Voice packs download quietly in the background and work offline once they're on your device • New exercise names arrive over time; no app update needed • Small fixes and polish throughout

Version 1.3

The developer, Carl Law, 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 Linked to You

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

    • Contact Info

  • Data Not Linked to You

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

    • 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

For more information, visit the developer’s accessibility website .

Information

Seller
  • Carl Law
Size
  • 149.9 MB
Category
  • Health & Fitness
Compatibility
Requires iOS 15.0 or later.
  • iPhone
    Requires iOS 15.0 or later.
  • iPad
    Requires iPadOS 15.0 or later.
  • iPod touch
    Requires iOS 15.0 or later.
  • Apple Watch
    Requires watchOS 10.0 or later.
Languages
English and 9 more
  • English, Arabic, French, German, Hindi, Japanese, Portuguese, Russian, Simplified Chinese, Spanish
Age Rating
4+
In-App Purchases
Yes
Copyright
  • © 2026 Carl Law
  • Privacy Policy

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