Somebody tried to summon me, but it did not work because I was asleep at that moment. However, I have arrived now and will do my best to answer the question:
I do not remember if Ryan and Matthew have recommended an app to keep track of time, but I do recall which app Josh Taylor recommended in Episode 028 (because it was in response to a question that I had sent in): the app is called “Sloth” and it can be found in the show notes for that episode. Unfortunately, the app appears to be iOS only and not Android yet. I don’t know for sure if it’s free or not, but from the screenshots I could find, it does appear to be a free app.