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Periodical vs drip: catalog facts
Periodical	drip
Best for: Android users who want a private, open-source period calendar	Best for: People who want to track their cycle without sharing health data with a company
Free Free and open source under the GPL-3.0-or-later licence.	Free Free and open source.
Android	Android, iOS
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	All data stays on the device Supports the symptothermal method for fertility awareness All 4 strengths for drip All data stays on the device Supports the symptothermal method for fertility awareness Transparent about how predictions are calculated APK available outside Google Play
Calendar method is not reliable for contraception Simple feature set compared with commercial cycle trackers	No sync between devices Fertility features depend on careful manual tracking
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License not stated
Not stated if an account is needed	Not stated if an account is 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 drip dripapp.org f-droid.org/packages/com.drip apps.apple.com/us/app/drip-period-cycle-tracker/id1584564949 Catalog checked September 23, 2026

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