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DayCalcy

Simple ofline date calculator with reminder.
DayCalcy is a simple, private and completely offline date calculator with reminders.

Features:
- Calculate the number of days between dates, add or subtract days, calculate age, compare dates and work with time durations.
- Save important dates as reminders and get notified when they arrive.
- DayCalcy also includes Countdown Widgets for tracking upcoming events and a Year Progress Widget to view the progress of the current year directly from your home screen.

DayCalcy works without an internet connection and does not require online services.
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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 3.43.7 (79) suggested Added on Oct 27, 2026

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 7.0 or newer.

    It is built and signed by the original developer, 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.
    • com.daycalculator.dynamic.app.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 1.7 MiB PGP Signature | Build Log

  • Version 3.43.6 (78) - Added on Oct 22, 2026

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 7.0 or newer.

    It is built and signed by the original developer, 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.
    • com.daycalculator.dynamic.app.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 1.7 MiB PGP Signature | Build Log

    • New in version 3.43.5
    - Fixed the donation method card background in Light Mode.
    - Reduced spacing around the offline privacy message on the home screen.
    - Addressed the missing app title in the F-Droid listing.
  • Version 3.43.5 (77) - Added on Oct 15, 2026

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 7.0 or newer.

    It is built and signed by the original developer, 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.
    • com.daycalculator.dynamic.app.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 1.7 MiB PGP Signature | Build Log

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