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Periodical vs Mensinator: catalog facts
Periodical	Mensinator
Best for: Android users who want a private, open-source period calendar	Best for: Tracking periods privately on an Android phone
Free Free and open source under the GPL-3.0-or-later licence.	Free Free and open source under the MIT licence.
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	Customisable, colour-coded symptoms Cycle prediction from average period and luteal phase length All 4 strengths for Mensinator Customisable, colour-coded symptoms Cycle prediction from average period and luteal phase length Period and ovulation statistics Does not track user data
Calendar method is not reliable for contraception Simple feature set compared with commercial cycle trackers	Android only No tagged releases on the repository
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: MIT
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
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 Mensinator github.com/EmmaTellblom/Mensinator f-droid.org/packages/com.mensinator.app Catalog checked October 2, 2026

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