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Bluemoon vs Mooneva Cycle: catalog facts
Bluemoon	Mooneva Cycle
Best for: People who want a private, simple period tracker on Android	Best for: Tracking periods and fertility without sharing data with a cloud service
Free Free and open source.	Free Free and open source under the GPL-3.0, with no ads.
Android	Android
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	No internet permission, so cycle data stays on the device On-device encryption with PIN lock and discreet mode All 3 strengths for Mooneva Cycle No internet permission, so cycle data stays on the device On-device encryption with PIN lock and discreet mode Symptom and mood logging alongside cycle predictions
Android only Focused on basic tracking rather than detailed health insights	No cloud sync between devices Small project with no GitHub releases; installed through F-Droid
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-3.0
No account needed	No account 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 Mooneva Cycle mooneva.se github.com/aradar46/Mooneva-Cycle-Private-Period-Tracker f-droid.org/packages/com.mooneva.app Catalog checked October 2, 2026

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