Repeat Reminder is a free Android app developed by Ruval Enterprises, falling into the category of Business & Productivity. The app is a simple reminder tool that allows users to set intervals and receive notifications after each interval. The app offers two modes: Alarm and Interval Training, aka Countdown, mode. In the Alarm mode, users receive a beep at the end of each interval, while in Countdown mode, the phone counts down each period.

Users can store up to 9 favorites for each mode and swipe through them. The app also has an active period feature, where it only beeps during the hours defined for the favorite.

One thing to keep in mind is to leave the display on, otherwise, the Android "battery saver" algorithm could make the app unreliable. You can switch to other apps as needed, but you need to return to Repeat Reminder because the app, when in the foreground, blocks the display from turning off.

Overall, Repeat Reminder is a useful app for those who need to repeat something every so often, be it for HIIT workouts, kitchen timers, or pill reminders. It is a straightforward app with relevant features that make it simple to use.