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Periodical vs Mooneva Cycle: catalog facts
Periodical	Mooneva Cycle
Best for: Android users who want a private, open-source period calendar	Best for: Tracking periods and fertility without sharing data with a cloud service
Free Free and open source under the GPL-3.0-or-later licence.	Free Free and open source under the GPL-3.0, with no ads.
Android	Android
Calculates fertile days and tracks symptoms and notes Backup to a single compressed file on local storage All 4 strengths for Periodical Calculates fertile days and tracks symptoms and notes Backup to a single compressed file on local storage Available from F-Droid, Google Play or as an APK Translated through a community Crowdin project	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
Calendar method is not reliable for contraception Simple feature set compared with commercial cycle trackers	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
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 Periodical arnowelzel.de/projekte/periodical f-droid.org/packages/de.arnowelzel.android.periodical 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

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