A menstrual calender with calculation of fertile days according to Knaus-Ogino.
About Periodical
Periodical is a health & fitness app developed by Arno Welzel.
Download Statistics
Periodical has been downloaded 26 thousand times. In the last 30 days, the app was downloaded 250 times.
User Ratings
Periodical is rated 4.82 out of 5 stars. The rating is based on 170 ratings.
App Information
Periodical is FREE to download. The APK download size is 2.74 MB. The latest version available is 1.96. The last update was on April 19, 2026.
Technical Requirements
Periodical requires Android 5.0+ or higher. The app has a content rating of Everyone. The app has been available on Google Play May 2012.
Description
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.
Recent changes: A cycle can start without change of the average calculation.
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Simple and elegant For tracking your periods with a minimum of fuss this is an elegant solution. Major praise for it being plain looking, and not covered in pink or flowers! Does what it says on the box.
★★★★★Madeleine Read· Aug 27, 2024
For what I need -- very basic period tracking -- Periodical is perfect: two taps every month are enough to track what I want to, and no worries that my data is being sold or stolen. I used to use Clue and am so glad not to be bombarded with ads to upgrade or have to click through an endless series of buttons in order to track a single day.
★★★★☆E· Jan 12, 2026
Private, no frills' app; I've used it for years. Being offline and having a neutral color scheme were the primary reasons I chose Periodical over other apps. I personally find it pretty accurate, but it depends on your body chemistry. While it does predict your ovulation window I do wish it had a system for actually adjusting the predictions based on user data, like opk test results. I used a different app for a while that did this but came back to Periodical when that one broke.
★★☆☆☆Holly M· Sep 30, 2023
Love the app, everything is easy to use. But please add notifications! The main point of cycle tracking is so that you and your sheets are prepared for the big week. It's not possible to always be on top and remembering to check the app. Please add reminder notifications.
Google Play Rankings for Periodical
This app is not ranked
Technologies used by Periodical
Periodical is requesting 1 permissions and is using 12 libraries.
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