A simple HIIT app specifically engineered for Apple Watch. It also provides a simple HIIT timer for iPhone/iPad.

With easy setup, clean display, live heart rate, haptic feedback, workout summary and completely independent Apple Watch app experience, your interval workouts will undoubtedly be fun.

The workout also adds up to the move and exercise rings on Apple Watch.


• Super easy setup
Digital crown makes setting intervals a breeze. The app remembers your previous settings.

• Clean display
Large fonts, vivid colors, live heart rate

• Workout summary
Calories burned, average and max heart rate, total time

• Health app integration
Workouts are saved to the Health app

• Audio alerts and haptic feedback
Subtle haptic feedback guiding you through the intervals. You can also set audio beep alerts if you want.

• Runs in background
A completely independent Apple Watch app experience

• Complications
They show the time left for the workout. Also, they are a quick way to launch the app.

• More settings
+ Warm up interval
+ Cooldown interval
+ Last rest interval
+ Halfway alert
+ 8 sec warning during rest
+ Interval change warning (when 5 seconds are remaining)

• Extra
A simple HIIT timer for iPhone/iPad

* Note: Though this app is primarily designed for Apple Watch, it also provides a simple iPhone/iPad HIIT timer.

What’s New

Version 2.2

• Skip current interval feature
• More powerful interval change warning options so that you do not miss the interval change
• Fixed audio ducking issues for beep alert when music is played
• Other enhancements and bug fixes

Ratings and Reviews

3.7 out of 5
3 Ratings
3 Ratings
MjG3633 ,

Don’t buy

Does not download to Apple Watch 4. Payed for the app and didn’t get what I payed for. Don’t waste your money. Terrible.

Developer Response ,

Hi, We just tested the app on Apple Watch Series 4 and it installs and runs normally. Looks like you are facing sync issues between your Apple Watch and iPhone.

Could you try the following:
1. Restart iPhone
2. Open the Watch app on iPhone
3. Scroll down to HIIT (Watch) app in available apps and tap "Install".

This should resolve the issue. If this does not fix the issue, please email support so that we can help you more seamlessly:


Brian T. Edmondson ,

Awesome and Easy

Really like this app. Really easy to use and setup. The fact that it's native for the Apple Watch really makes the display and prompts easy and visually appealing.

Integrates with Apple Health perfectly.

Love it!


RhythmicWorks Software LLP
85.5 MB
Health & Fitness

Requires iOS 10.3 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Rated 4+
© 2018 RhythmicWorks™


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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