[plastic_bag]

There's a FOSS alternative called Drip.

https://dripapp.org/

It is funded by Mozilla and Open Knowledge Foundation. Available on iOS and Android.

[azalemeth]

Mensinator is also another FOSS that uses no third party sdks and is reproducibly built for android, fairly actively used, and made by women. https://github.com/EmmaTellblom/Mensinator

[carstenhag]

As I had failed finding an app that was not ad-ridden or oldish, my girlfriend and I are using this (I am copying her values, to know when her period will be). Also contributing some code :)

[xandrius]

> Mozilla

So they will end up killing it soon? /s

[sshine]

This gets downvoted for being negative, but it was my immediate reaction when I saw "Mozilla": They're axing projects that don't align for strategic reasons that probably make sense, but is simultaneously very Googly.

Association with Mozilla is a cause for concern when considering the longevity of a project.