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FOSS Android app: Loop Habit Tracker
(github.com)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
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This app is everything it needs to be. It looks modern, has nice visuals, I was able to import data from an old tracking app.
It's such a nice feeling when you find an app that hits all the checkmarks and then you find out it's FOSS as well.