Simple Interval Timer (SIT) can be used for any kind of interval training, such as running, cycling, HIIT sessions (including Tabata method), stretching, etc.

SIT is exactly what you would expect. An interval timer, which is easy to set up and use. It features a nice plain design, with no unnecessary controls.

Adjust Number of Sets, Action and Break duration to your needs and you are ready to go!

On the iOS an extra switch control allows you to prevent the screen from dimming.

SIT remembers the last 5 configurations you have used. Swipe left across the Settings screen to switch to another configuration.

SIT can run in the background, while you are playing music, watching videos or doing anything else on your iOS device.

SIT Watch features the same simplicity as the iOS app while offering the same functionality, plus it will measure your heartbeat during the workout sessions. The recordings will be available in the Apple's Health app.

SIT Watch runs independently of the phone, so no need to have your phone around during your workouts (although you will need your phone during the very first time you launch SIT watch).

SIT lets you avoid any tedious set up and focus on your training!

What’s New

Version 2.0.1

Corrected "Contact" info

Ratings and Reviews

3.9 out of 5
36 Ratings

36 Ratings

sac109 ,

Good simple HIIT timer app

This app has everything I need for HIIT workouts. It’s simple and streamlined. Love it on my phone. My only complaint is that the watch notifications need to have a stronger vibration setting. I can barely feel it vibrate when working out with just my watch so I keep having to check on the timer to be sure I didn’t miss the rest periods.

chrisygetz ,

SIT is awesome!

Finally a free app that doesn't limit the number of times you can use the timer before you have to pay! Worked perfectly for the circuit I use for working out. It was so nice not to have to reset a timer between each exercise. The app also counts down the last three seconds so you know when to switch. Great app!

Mr. Perry ,

Functional, but needs improved Watch compatibility.

Streamlined and functional, this app works great on the iPhone, but needs Watch improvements. It needs a stronger haptic alarm for its Watch functionality, I have my haptic alert maxed out and I barely feel it when the timer goes off. I don't know what the setting for haptic alerts is with this app, but it is much to low.


Alena Kazarova
29.9 MB

Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Rated 4+
© 0FF
In-App Purchases
  1. Ad-free version $2.99


  • Family Sharing

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

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