Routine Timer - Interval is an Android application developed by el cheikh. It is a versatile interval timer that can be used for various activities such as workout, cooking, running, and studying. The app allows users to create a sequence of timers for their activities, making it easy to keep track of time.

The app is user-friendly and straightforward. Users can create their own activities with multiple tasks and run them easily. The app also offers features such as notification on finishing each task, the option to notify with an alarm screen on the task screen, and full-screen mode that remains the screen on and makes a sound on finishing the task. Additionally, users can run multiple activities simultaneously and see all active activities in the home screen.