The UI design is inspired on an existing app, however, it tries to solve a couple of issues namely to follow Zen tradition more closely:
– Available durations changed to be 15, 20, 30 and 40 minutes.
– Interval bells automatically selected based on the duration (none for 15 min, 1 interval for 20 min, and 2 intervals for 30 and 40 min).
– Only 2 clicks to change duration.
– Bell sounds based on sfzc.org audio.
Live app available on the App Store.