Standup is a macOS menu bar app that reminds you to take breaks based on your actual activity. It tracks keyboard and mouse input, so the timer pauses when you step away and only counts real work time. It also detects video calls (Zoom, Teams, etc.
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Stretchly Alternatives
Stretchly is described as 'Is cross-platform open source app that reminds you to take breaks when working with computer' and is a very popular Prevent RSI app in the sport & health category. There are more than 50 alternatives to Stretchly for a variety of platforms, including Mac, Windows, Linux, Android and iPhone apps. The best Stretchly alternative is Workrave, which is both free and Open Source. Other great apps like Stretchly are Loook, Sane Break, Safe Eyes Linux and BreakTimer.