Compare software

Bluemoon vs drip: catalog facts
Bluemoon	drip
Best for: People who want a private, simple period tracker on Android	Best for: People who want to track their cycle without sharing health data with a company
Free Free and open source.	Free Free and open source.
Android	Android, iOS
Data stays on the device Simple interface All 3 strengths for Bluemoon Data stays on the device Simple interface Available on F-Droid and Google Play	All data stays on the device Supports the symptothermal method for fertility awareness All 4 strengths for drip All data stays on the device Supports the symptothermal method for fertility awareness Transparent about how predictions are calculated APK available outside Google Play
Android only Focused on basic tracking rather than detailed health insights	No sync between devices Fertility features depend on careful manual tracking
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License not stated
No account needed	Not stated if an account is needed
Offline features available	Offline features available
Official website Full listing and sources Sources for Bluemoon nilsgrob.ch/work/bluemoon Catalog checked October 2, 2026	Official website Full listing and sources Sources for drip dripapp.org f-droid.org/packages/com.drip apps.apple.com/us/app/drip-period-cycle-tracker/id1584564949 Catalog checked September 23, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.