No self hosting needed! As I mentioned, these apps are fully offline - all data is stored on-device

There are foss offline period tracking apps you can reccommend instead. Best if they just don’t have the data at all

Mensinator

Bluemoon

Drip

mitid recently implemented play integrity, it should still work if previously installed but new installations don’t work (https://discuss.grapheneos.org/d/1520-status-of-mitid-app/279)