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Periodical

Name: Periodical
Author: askaaron

askaaron

A menstrual calender with calculation of fertile days according to Knaus-Ogino.

Calendar
FOSS
Free
No ads
No tracking

Android only

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What are these stores? Google Play, Aurora Store, F-Droid, Zapstore

This application calculates the fertile days according to Knaus-Ogino and can track menstrual symptoms. WARNING: It is not recommended to use this calendar to avoid pregnancy! There are more accurate methods, like measuring the basal body temperature. The data can be backed up on a memory card or "internal" memory, if present.

Developer: askaaron
Website: arnowelzel.de/wiki/android/app/periodical
Source code: codeberg.org/askaaron/periodical
Added to AppCosmos: 9 October 2026
License: GPL-3.0-or-later