Interval Timer (PFA) is described as 'Privacy Friendly Interval Timer supports the user during his/her circuit training session and helps him achieve his/her training goals. In order to support the user during his training, the app provides stopwatches, which can be configured according to the user’s own training' and is an app. There are more than 10 alternatives to Interval Timer (PFA) for a variety of platforms, including Android, iPhone, iPad, F-Droid and Android Tablet apps. The best Interval Timer (PFA) alternative is TimeR Machine, which is both free and Open Source. Other great apps like Interval Timer (PFA) are Workout Time!, Just Another Workout Timer, TimerLabs and Norwegian 4x4 Protocol App.