HIIT alternativesHIIT is an open-source app for Android and F-Droid. It is free to use. Developed by Adam T. Ryder.AlternativesTimeR MachineWorkout Time!Custom WorkoutsInterval Timer (PFA)Just Another Workout TimerAika Workout TimerTimerLabsSeconds Interval TimerProtoFit: Workout & HIIT TimerStopwatch and Timer for ExerciseOnline Interval TimerInterval Timer