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Periodical

Menstrual/period calendar
This application calculates the days of fertility according to Knaus-Ogino. The
data can be backed up on a memory card, if present.

WARNING: It is not recommended to use this calendar to avoid pregnancy! There
are more accurate methods, like measuring the basal body temperature.

Versions

Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.

Download F-Droid
  • Version 1.75 (99) suggested Added on Oct 25, 2023

    This version requires Android 5.0 or newer.

    It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.

    Permissions
    • de.arnowelzel.android.periodical.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 2.6 MiB PGP Signature | Build Log

  • Version 1.74 (96) - Added on Oct 08, 2023

    This version requires Android 5.0 or newer.

    It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.

    Permissions
    • de.arnowelzel.android.periodical.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 2.6 MiB PGP Signature | Build Log

  • Version 1.73 (95) - Added on Sep 25, 2023

    This version requires Android 5.0 or newer.

    It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.

    Permissions
    • de.arnowelzel.android.periodical.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 2.6 MiB PGP Signature | Build Log