Periodical icon

10.0 1 Reviews


1.80 by Arno Welzel


Dec 2, 2024

About Periodical

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

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.

If you have any further questions or want to help me with translations in other languages, please contact me via e-mail - thank you.

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

You can obtain the source on my website.

What's New in the Latest Version 1.80

Last updated on Dec 2, 2024

Updated translations and improved stability.

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Additional APP Information

Latest Version

Request Periodical Update 1.80

Uploaded by

Cel Li

Requires Android

Android 5.0+

Available on

Get Periodical on Google Play

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Periodical Screenshots

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