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Kefir Control

Minimalist app to track milk kefir fermentation times.
Kefir Control was born out of the need to remember when milk kefir fermentation is at its perfect point. If left for too long, kefir becomes excessively acidic and the whey separates too much. This application simplifies that process with scheduled local notifications and a visual timer.

Core Features:
- Quick Timers: Choose between 24h, 36h, or 48h of fermentation.
- Past Fermentation Logging: If you forgot to start the timer, you can set the start time manually.
- Local Notifications (Off-grid): The app schedules the alarm using your own device, working offline and without servers.
- Full History: Keep a record of all your past harvests to maintain strict control.
- Privacy First: No user accounts, no analytics, and no cross-site tracking. Data lives exclusively on your device.

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 2.2.2 (83) suggested Added on Apr 12, 2026

    x86_64

    This version requires Android 7.0 or newer.

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

    Permissions
    • show notifications
      Allows the app to show notifications
    • run at startup
      Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
    • Schedule precisely timed actions
      This app can schedule work to happen at a desired time in the future. This also means that the app can run when you're not actively using the device.
    • Schedule alarms or event reminders
      This app can schedule actions like alarms and reminders to notify you at a desired time in the future.
    • control vibration
      Allows the app to control the vibrator.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • eu.raulmorales.kefircontrol.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 21 MiB PGP Signature | Build Log

  • Version 2.2.2 (82) - Added on Apr 12, 2026

    arm64-v8a

    This version requires Android 7.0 or newer.

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

    Permissions
    • show notifications
      Allows the app to show notifications
    • run at startup
      Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
    • Schedule precisely timed actions
      This app can schedule work to happen at a desired time in the future. This also means that the app can run when you're not actively using the device.
    • Schedule alarms or event reminders
      This app can schedule actions like alarms and reminders to notify you at a desired time in the future.
    • control vibration
      Allows the app to control the vibrator.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • eu.raulmorales.kefircontrol.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 19 MiB PGP Signature | Build Log

  • Version 2.2.2 (81) - Added on Apr 12, 2026

    armeabi-v7a

    This version requires Android 7.0 or newer.

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

    Permissions
    • show notifications
      Allows the app to show notifications
    • run at startup
      Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
    • Schedule precisely timed actions
      This app can schedule work to happen at a desired time in the future. This also means that the app can run when you're not actively using the device.
    • Schedule alarms or event reminders
      This app can schedule actions like alarms and reminders to notify you at a desired time in the future.
    • control vibration
      Allows the app to control the vibrator.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • eu.raulmorales.kefircontrol.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 17 MiB PGP Signature | Build Log

  • Version 2.2.1 (73) - Added on Apr 10, 2026

    x86_64

    This version requires Android 7.0 or newer.

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

    Permissions
    • show notifications
      Allows the app to show notifications
    • run at startup
      Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
    • Schedule precisely timed actions
      This app can schedule work to happen at a desired time in the future. This also means that the app can run when you're not actively using the device.
    • Schedule alarms or event reminders
      This app can schedule actions like alarms and reminders to notify you at a desired time in the future.
    • control vibration
      Allows the app to control the vibrator.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • eu.raulmorales.kefircontrol.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 21 MiB PGP Signature | Build Log

  • Version 2.2.1 (72) - Added on Apr 10, 2026

    arm64-v8a

    This version requires Android 7.0 or newer.

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

    Permissions
    • show notifications
      Allows the app to show notifications
    • run at startup
      Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
    • Schedule precisely timed actions
      This app can schedule work to happen at a desired time in the future. This also means that the app can run when you're not actively using the device.
    • Schedule alarms or event reminders
      This app can schedule actions like alarms and reminders to notify you at a desired time in the future.
    • control vibration
      Allows the app to control the vibrator.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • eu.raulmorales.kefircontrol.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 19 MiB PGP Signature | Build Log

  • Version 2.2.1 (71) - Added on Apr 10, 2026

    armeabi-v7a

    This version requires Android 7.0 or newer.

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

    Permissions
    • show notifications
      Allows the app to show notifications
    • run at startup
      Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
    • Schedule precisely timed actions
      This app can schedule work to happen at a desired time in the future. This also means that the app can run when you're not actively using the device.
    • Schedule alarms or event reminders
      This app can schedule actions like alarms and reminders to notify you at a desired time in the future.
    • control vibration
      Allows the app to control the vibrator.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • eu.raulmorales.kefircontrol.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 17 MiB PGP Signature | Build Log

  • Version 2.2.0 (63) - Added on Apr 09, 2026

    x86_64

    This version requires Android 7.0 or newer.

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

    Permissions
    • show notifications
      Allows the app to show notifications
    • run at startup
      Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
    • Schedule precisely timed actions
      This app can schedule work to happen at a desired time in the future. This also means that the app can run when you're not actively using the device.
    • Schedule alarms or event reminders
      This app can schedule actions like alarms and reminders to notify you at a desired time in the future.
    • control vibration
      Allows the app to control the vibrator.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • eu.raulmorales.kefircontrol.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 20 MiB PGP Signature | Build Log

  • Version 2.2.0 (62) - Added on Apr 09, 2026

    arm64-v8a

    This version requires Android 7.0 or newer.

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

    Permissions
    • show notifications
      Allows the app to show notifications
    • run at startup
      Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
    • Schedule precisely timed actions
      This app can schedule work to happen at a desired time in the future. This also means that the app can run when you're not actively using the device.
    • Schedule alarms or event reminders
      This app can schedule actions like alarms and reminders to notify you at a desired time in the future.
    • control vibration
      Allows the app to control the vibrator.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • eu.raulmorales.kefircontrol.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 19 MiB PGP Signature | Build Log

  • Version 2.2.0 (61) - Added on Apr 09, 2026

    armeabi-v7a

    This version requires Android 7.0 or newer.

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

    Permissions
    • show notifications
      Allows the app to show notifications
    • run at startup
      Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
    • Schedule precisely timed actions
      This app can schedule work to happen at a desired time in the future. This also means that the app can run when you're not actively using the device.
    • Schedule alarms or event reminders
      This app can schedule actions like alarms and reminders to notify you at a desired time in the future.
    • control vibration
      Allows the app to control the vibrator.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • eu.raulmorales.kefircontrol.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 17 MiB PGP Signature | Build Log