Let me start with, it doesn’t work on my device, an iPhone X. It shows it is playing, but no sound at all. Downloaded another of this kind and works with no issues.
It seems this app was done by somebody following a learning tutorial. It’s simplistic to the extreme
I love the concept and it’s really what I’m looking for, that’s defining my own streams of tones with defined times for each, BUT doesn’t work for me
UPDATE: turns out it doesn’t work with internal speakers, but through Bluetooth. Changed feedback from 1 star to 4, still don’t like the UI