Keep count of your reps while exercising, or any other kind of tally count while still using your phone to browse the web, watch youtube, or anything else you want. Tiny window covers very little space, but offers all the features you need in a counter. No ads, no tracking, less than 100k download!
Floating Rep Counter
free version: bug fixes.
Paid version: many new features, including more counters, and audio/haptic feedback.