Comment by treetalker

I have an Apple Watch app that does this! It's called Tap Me Every X Minutes.[1] (I'm not the creator, no affiliation, just a happy user.)

Every so often I'll decide to track/log my time and activities every 15 minutes over a few days, just to keep tabs on where my time and energy are really going. This app fits the bill: it's silent and unobtrusive to others and it's never failed to perform properly for me. I just wish it had an option to display a countdown timer for the upcoming tap.

[1]: https://apps.apple.com/us/app/tap-me-every-x-minutes/id15116...