Circle Timer is a free iPhone app developed by Healthy ApS that allows users to easily design and customize interval programs. Whether you need basic intervals or want to create more complex programs with various pausing and working intervals, Circle Timer has got you covered.

With its intuitive and user-friendly graphical interface, you can design your interval programs in seconds without the need for any typing. Simply specify the length of the work interval and the length of the pause interval, and press play to start.

For more advanced users, Circle Timer offers the option to set an interval and add it multiple times by pressing the "+" button. If you make changes to the interval, it will be added as a new ball, allowing for greater flexibility and customization.

Circle Timer also allows you to save your favorite programs for later use, making it easy to access and switch between different interval programs. Additionally, the app offers various sound schemes that you can choose from through in-app purchases.

Compatible with both iPhone and iPad, Circle Timer is a versatile tool that can help you optimize your workout routines, productivity sessions, or any activity that requires interval timing.