Periodical
9.6 18
v1.97 by Arno Welzel
Editor's Review
“Periodical” is a calendar to calculate the fertile days according to Knaus-Ogino.About Periodical
Periodical (Package Name: de.arnowelzel.android.periodical) is developed by Arno Welzel and the latest version of Periodical 1.97 was updated on October 6, 2026. Periodical is in the category of Health & Fitness. You can check all apps from the developer of Periodical and find 200 alternative apps to Periodical on Android. Currently this app is for free. This app can be downloaded on Android 6.0+ on APKFab or Google Play. All APK/XAPK files on APKFab.com are original and 100% safe with fast download.
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.
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.
Periodical 1.97 Update
A cycle can start without change of the average calculation.
Read More
Periodical Features
Previous Versions
More
Requires Android: Android 6.0+
Screen DPI: 160-240dpi
SHA1: 0961753878701e8367fc3b0cac9fd7fcf842e642
Size: 2.96 MB
What's New:
A cycle can start without change of the average calculation.
Requires Android: Android 5.0+
Screen DPI: 160-240dpi
SHA1: f3fc8a984635db398214bef13811dbd578bb0050
Size: 2.77 MB
What's New:
A cycle can start without change of the average calculation.
Requires Android: Android 5.0+
Screen DPI: 160-240dpi
SHA1: 6a9f1da05573c0565808e5d2d9af53a711bbcb8b
Size: 4.79 MB
What's New:
A cycle can start without change of the average calculation.
Requires Android: Android 5.0+
Screen DPI: 160-240dpi
SHA1: 1844433c7a81cf209df498a92c6b65e2c9db2235
Size: 4.73 MB
What's New:
Added options to disable display of cycle day or fertility indicators.
More Information
Package Name:
Category:
Update Date:
2026-10-06
Latest Version:
1.97
Need Update:
Available on:
Requirements:
Android 6.0+
Report:
Safe to Download
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