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Clue vs Bluemoon: catalog facts
Clue	Bluemoon
Best for: People who want to track their menstrual cycle on their phone	Best for: People who want a private, simple period tracker on Android
Free + paid options Free app with a paid subscription for additional features.	Free Free and open source.
Android, iOS	Android
Cycle predictions and personalised insights Available on both iOS and Android All 3 strengths for Clue Cycle predictions and personalised insights Available on both iOS and Android Science-based approach to content	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
Some features require a subscription Sensitive health data is handled by a commercial service	Android only Focused on basic tracking rather than detailed health insights
Downloadable app	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 Clue helloclue.com play.google.com/store/apps/details apps.apple.com/us/app/clue-period-cycle-tracker/id657189652 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.