Comment by ErikBjare

I've been building ActivityWatch as an open source local-first cross-platform time-tracker that does this too (also with an API).

We even built an app "Thankful" which let's users donate to creators they frequent way back in 2018. Never went anywhere, but I still kinda believe in the idea.

Nice to see you got iOS screen time working! We've tried over the years, but Apple always made it hard. I'll have a look how you approached it.