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CalSync

Sync events across multiple local device calendars automatically.
Calendar Sync automatically copies events from one local calendar to another on your device. When an event appears in your source calendar, a corresponding event is created in your target calendar using a name you choose.

Perfect for sharing availability across personal and work calendars, or keeping multiple calendars in sync without manual entry.

Features:
- Select any local device calendar as source or target
- Customize the synced event name (e.g., "Busy")
- Original event title is preserved in the description
- Sync runs automatically in the background at your chosen interval
- Changes to already-synced events are detected and propagated
- Deletions in the source calendar are mirrored to the target

No account required. All data stays 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 1.5.5 (223) suggested Added on Jun 21, 2026

    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
    • view network connections
      Allows the app to view information about network connections such as which networks exist and are connected.
    • run foreground service
      Allows the app to make use of foreground services.
    • show notifications
      Allows the app to show notifications
    • Read calendar events and details
      This app can read all calendar events stored on your phone and share or save your calendar data.
    • 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.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • add or modify calendar events and send email to guests without owners' knowledge
      This app can add, remove, or change calendar events on your phone. This app can send messages that may appear to come from calendar owners, or change events without notifying their owners.
    • dev.henriquecouto.calsync.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 18 MiB PGP Signature | Build Log

  • Version 1.5.5 (222) - Added on Jun 21, 2026

    arm64-v8a

    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
    • view network connections
      Allows the app to view information about network connections such as which networks exist and are connected.
    • run foreground service
      Allows the app to make use of foreground services.
    • show notifications
      Allows the app to show notifications
    • Read calendar events and details
      This app can read all calendar events stored on your phone and share or save your calendar data.
    • 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.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • add or modify calendar events and send email to guests without owners' knowledge
      This app can add, remove, or change calendar events on your phone. This app can send messages that may appear to come from calendar owners, or change events without notifying their owners.
    • dev.henriquecouto.calsync.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 17 MiB PGP Signature | Build Log

  • Version 1.5.5 (221) - Added on Jun 21, 2026

    armeabi-v7a

    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
    • view network connections
      Allows the app to view information about network connections such as which networks exist and are connected.
    • run foreground service
      Allows the app to make use of foreground services.
    • show notifications
      Allows the app to show notifications
    • Read calendar events and details
      This app can read all calendar events stored on your phone and share or save your calendar data.
    • 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.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • add or modify calendar events and send email to guests without owners' knowledge
      This app can add, remove, or change calendar events on your phone. This app can send messages that may appear to come from calendar owners, or change events without notifying their owners.
    • dev.henriquecouto.calsync.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 14 MiB PGP Signature | Build Log

  • Version 1.3.0 (133) - Added on Jun 20, 2026

    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
    • view network connections
      Allows the app to view information about network connections such as which networks exist and are connected.
    • run foreground service
      Allows the app to make use of foreground services.
    • show notifications
      Allows the app to show notifications
    • Read calendar events and details
      This app can read all calendar events stored on your phone and share or save your calendar data.
    • 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.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • add or modify calendar events and send email to guests without owners' knowledge
      This app can add, remove, or change calendar events on your phone. This app can send messages that may appear to come from calendar owners, or change events without notifying their owners.
    • dev.henriquecouto.calsync.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 18 MiB PGP Signature | Build Log

  • Version 1.3.0 (132) - Added on Jun 20, 2026

    arm64-v8a

    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
    • view network connections
      Allows the app to view information about network connections such as which networks exist and are connected.
    • run foreground service
      Allows the app to make use of foreground services.
    • show notifications
      Allows the app to show notifications
    • Read calendar events and details
      This app can read all calendar events stored on your phone and share or save your calendar data.
    • 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.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • add or modify calendar events and send email to guests without owners' knowledge
      This app can add, remove, or change calendar events on your phone. This app can send messages that may appear to come from calendar owners, or change events without notifying their owners.
    • dev.henriquecouto.calsync.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 17 MiB PGP Signature | Build Log

  • Version 1.3.0 (131) - Added on Jun 20, 2026

    armeabi-v7a

    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
    • view network connections
      Allows the app to view information about network connections such as which networks exist and are connected.
    • run foreground service
      Allows the app to make use of foreground services.
    • show notifications
      Allows the app to show notifications
    • Read calendar events and details
      This app can read all calendar events stored on your phone and share or save your calendar data.
    • 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.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • add or modify calendar events and send email to guests without owners' knowledge
      This app can add, remove, or change calendar events on your phone. This app can send messages that may appear to come from calendar owners, or change events without notifying their owners.
    • dev.henriquecouto.calsync.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 14 MiB PGP Signature | Build Log

  • Version 1.1.3 (103) - Added on Jun 18, 2026

    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
    • view network connections
      Allows the app to view information about network connections such as which networks exist and are connected.
    • run foreground service
      Allows the app to make use of foreground services.
    • show notifications
      Allows the app to show notifications
    • Read calendar events and details
      This app can read all calendar events stored on your phone and share or save your calendar data.
    • 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.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • add or modify calendar events and send email to guests without owners' knowledge
      This app can add, remove, or change calendar events on your phone. This app can send messages that may appear to come from calendar owners, or change events without notifying their owners.
    • dev.henriquecouto.calsync.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 18 MiB PGP Signature | Build Log

  • Version 1.1.3 (102) - Added on Jun 18, 2026

    arm64-v8a

    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
    • view network connections
      Allows the app to view information about network connections such as which networks exist and are connected.
    • run foreground service
      Allows the app to make use of foreground services.
    • show notifications
      Allows the app to show notifications
    • Read calendar events and details
      This app can read all calendar events stored on your phone and share or save your calendar data.
    • 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.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • add or modify calendar events and send email to guests without owners' knowledge
      This app can add, remove, or change calendar events on your phone. This app can send messages that may appear to come from calendar owners, or change events without notifying their owners.
    • dev.henriquecouto.calsync.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 17 MiB PGP Signature | Build Log

  • Version 1.1.3 (101) - Added on Jun 18, 2026

    armeabi-v7a

    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
    • view network connections
      Allows the app to view information about network connections such as which networks exist and are connected.
    • run foreground service
      Allows the app to make use of foreground services.
    • show notifications
      Allows the app to show notifications
    • Read calendar events and details
      This app can read all calendar events stored on your phone and share or save your calendar data.
    • 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.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • add or modify calendar events and send email to guests without owners' knowledge
      This app can add, remove, or change calendar events on your phone. This app can send messages that may appear to come from calendar owners, or change events without notifying their owners.
    • dev.henriquecouto.calsync.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 15 MiB PGP Signature | Build Log