Compare software

Flo vs Bluemoon: catalog facts
Flo	Bluemoon
Best for: People tracking their menstrual cycle, ovulation or pregnancy on a phone	Best for: People who want a private, simple period tracker on Android
Free + paid options Free to download, with a paid premium subscription.	Free Free and open source.
Android, iOS	Android
Tracks periods, ovulation and pregnancy in one app Symptom logging alongside cycle dates	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
Proprietary service that handles sensitive health data Some features require a paid subscription	Android only Focused on basic tracking rather than detailed health insights
Downloadable app, Hosted service	Downloadable app
Not open source	Open source
License not stated	License: GPL-3.0-or-later
Not stated if an account is needed	No account needed
Not stated if it works offline	Offline features available
Official website Full listing and sources Sources for Flo flo.health play.google.com/store/apps/details apps.apple.com/us/app/flo-cycle-period-tracker/id1038369065 Catalog checked September 23, 2026	Official website Full listing and sources Sources for Bluemoon nilsgrob.ch/work/bluemoon Catalog checked October 2, 2026

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