It's a good timer – Bit Timer - Interval Timer for HIIT, Tabata, Crossfit, Running and Circuit Training Review

I wanted to use this app to do interval training while running. I could not hear the tones while I had my music playing in my Bluetooth headset. I was expecting a bit more.
Review by Paul......... on Bit Timer - Interval Timer for HIIT, Tabata, Crossfit, Running and Circuit Training.