They say time is is the most valuable resources. Right now, time feels quicker for me these days and I often lose track of it.
Because of that the app should have the same purposes as an old clock, it plays a little “ding” or a notification every 15 minutes, 30 minutes, or 1 hour, or as long as I like.
Preferably installable with f-droid, can I have an app recommendation.
I feel you. I guess what you need is a chime.
I used an hourly chimer app back when I was studying.
https://play.google.com/store/apps/details?id=com.caynax.hourlychime This is what I could find. Hope this helps.