About this app
HIIT Workouts is a no-fuss high-intensity interval timer built for Apple Watch — with an iPhone companion that's a full partner, not just a second screen. Set your total session length and work/rest splits, then put your wrist down and go: pronounced haptic cues call every transition so you never have to look at the screen. ON YOUR WATCH - Wall-clock-accurate interval timing, anchored so cues never drift - Strong, escalating haptics: a build-up countdown into each work and rest, a bigger jolt for the final interval, and a celebratory finish - Live heart rate and a workout saved to the Health app - Keeps running wrist-down for the whole session - A watch-face complication to launch straight into the app ON YOUR IPHONE - Start, pause, resume, or end a session from your phone — the watch follows in real time and records the real workout - Live countdown in big type: ring, phase, and set count, anchored to the same clock so both devices stay in lockstep - Live heart rate and active calories during the workout, with an average heart rate and calorie summary at the finish - Workout history straight from Health: duration, calories, and average heart rate for every HIIT session - Works with HIIT workouts logged by any app, not just this one START ON EITHER DEVICE Begin on your watch or your phone — whichever you reach first. Starting on one wakes and syncs the other, and if a device is closed or crashes mid-session, you can rejoin the workout already in progress. Designed watch-first for intervals, circuits, Tabata, and any work/rest routine.
Latest release
What’s New
The iPhone and Apple Watch are now equal partners. Start, pause, resume, or end a session from either device and the other follows the same countdown in real time — the watch still records the real workout and is woken from your phone if it isn't already running. Start a workout right from your iPhone — it opens HIIT on your watch so the countdown and haptics are ready on your wrist. Rejoin a workout in progress. If a device is closed or crashes mid-session, the start screen offers to drop you back into the live countdown. Your iPhone now shows live heart rate and active calories during a workout, plus an average-heart-rate and calorie summary at the finish. A new watch-face complication launches HIIT in a single tap. Custom session length and work/rest intervals now sync between your devices, so both start screens stay in step. Refreshed start and welcome screens, rounded typography throughout the watch app, and a new flame app icon.
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- First observed Sep 14, 2026 · 3:26 PM Free
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