Periodical

Name: Periodical
Rating: 4.84 (178 reviews)
Author: Arno Welzel

LiveArno Welzel1 app · 27.3K installsHealth & FitnessFreede.arnowelzel.android.periodical

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

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Total installs: 27,266
Installs / day: 0
Rating: 4.8★
Released: 15 Apr 2012
Last update: 2 Sept 2026
Countries: —

Install history

exact counter from Google Play

30dAll

Installs per day · last 90 days

Change timeline

No changes recorded yet. We compare every crawl with the previous one and list title, icon, screenshots, description, version, price and availability changes here.

Country availability

Availability has not been checked for this app yet. “Check all countries” looks the app up in about 140 Google Play storefronts and shows where it is live, listed but not installable, or missing — plus any country-specific (custom) store listings.

Top countries

Country data will be available soon.

We estimate where downloads come from using the app’s position in Google Play’s top charts in about 140 countries. This app is not in any chart we have collected yet; the estimate appears as soon as it is.

Top chart positions

Not in any tracked top chart.

App manifest

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Data safety

declared by the developer on Google Play

No data shared with third parties
No data collected

This is the developer's own declaration, summarised from the Play listing. The permissions below show what the app is technically able to access.

Store listing

Full 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.

What's new

A cycle can start without change of the average calculation.

Growing in Health & Fitness

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