Casio G-Shock Smart Sync

Add smart functions to your Casio square BT G-Shock Watch.

G-Shock Smart Sync is an unofficial, open-source Android app for G-Shock, Edifice, and Pro Trek watches. It allows you to control your watch, sync data, and configure settings without a Casio ID. It offers a faster, privacy-focused, and more powerful alternative to the official Casio app.

Key Features:
- No Account Required: Skip the Casio ID login entirely.
- Calendar Sync: Push your calendar events (Google, Samsung, etc.) to your watch as reminders.
- Auto Timezone: Automatically adjusts watch time when you travel.
- Remote Control: Use your watch buttons to take photos, control music, or launch voice assistants.
- Alarm Sync: Configure watch alarms easily from your phone.
- Phone Finder: Trigger a loud alarm on your phone to find it.

Supported Watch Models:
The app works with many Bluetooth-enabled G-Shock, Edifice, and Pro Trek models.

- Square: GW-B5600, GMW-B5000, GW-B5000, DW-B5600, TRN-50
- CasiOak: GA-B2100, GBM-2100, GMC-B2100, MRG-B2100
- G-Steel: GST-B100 to B1000, GST-W1000, ECB-900
- Edifice: ECB-10 to ECB-2300, EQB-500 to EQB-2000
- MT-G / MR-G: MTG-B1000/B3000/B3100, MRG-B5000/B2100
- Others: ABL-100WE, GBD-100/200, GBD-H1000/H2000, GPR-B1000

Note: While these watches connect, not all specific hardware features may be fully supported yet.

App Walkthrough:

1. Connection Screen: Handles the Bluetooth connection via BLE. Connection is typically much faster than the official app (~3.5s vs 12s).
2. Time Setting: Manage your watch's timekeeping effortlessly. Sync your phone's time, timezone, and DST settings to the watch immediately.
3. Alarms: Read and configure the 5 alarms stored on your watch and the hourly signal (Chime).
4. Events (Calendar Sync): Sync your Android calendars to your watch! Pushes events to the watch's Reminder feature.
5. Actions (Remote Control): Turn your watch into a remote control. Assign actions to button presses (Find Phone, Take Photo, Flashlight, Next Track, Voice Assist, Set Prayer Alarms).
6. Settings: Configure app and watch preferences like light duration, power saving, and more.

Related Projects:
- G-Shock Time Server: Headless time server for Raspberry Pi or Linux.
- G-Shock API for ESP32: Standalone time server firmware for ESP32.
- G-Shock Smart Sync Webapp: Browser-based synchronization via Web Bluetooth.
- GShockAPI: The core library this app is built on.

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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 42.9.11 (42911) suggested Added on Sep 20, 2026

arm64-v8a armeabi-v7a x86 x86_64

This version requires Android 8.0 or newer.

It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.
Permissions
- access approximate location only in the foreground
  
  This app can get your approximate location from location services while the app is in use. Location services for your device must be turned on for the app to get location.
- view network connections
  
  Allows the app to view information about network connections such as which networks exist and are connected.
- access Do Not Disturb
  
  Allows the app to read and write Do Not Disturb configuration.
- pair with Bluetooth devices
  
  Allows the app to view the configuration of the Bluetooth on the phone, and to make and accept connections with paired devices.
- access Bluetooth settings
  
  Allows the app to configure the local Bluetooth phone, and to discover and pair with remote devices.
- connect to paired Bluetooth devices
  
  Allows the app to connect to paired Bluetooth devices
- discover and pair nearby Bluetooth devices
  
  Allows the app to discover and pair nearby Bluetooth devices
- directly call phone numbers
  
  Allows the app to call phone numbers without your intervention. This may result in unexpected charges or calls. Note that this doesn't allow the app to call emergency numbers. Malicious apps may cost you money by making calls without your confirmation.
- take pictures and videos
  
  This app can take pictures and record videos using the camera while the app is in use.
- run foreground service
  
  Allows the app to make use of foreground services.
- run foreground service with the type "connectedDevice"
  
  Allows the app to make use of foreground services with the type "connectedDevice"
- have full network access
  
  Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.
- change your audio settings
  
  Allows the app to modify global audio settings such as volume and which speaker is used for output.
- 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.
- read the contents of your shared storage
  
  Allows the app to read the contents of your shared storage.
- record audio
  
  This app can record audio using the microphone while the app is in use.
- Companion Watch profile permission to manage watches
  
  Allows a companion app to manage watches.
- run in the background
  
  This app can run in the background. This may drain battery faster.
- use data in the background
  
  This app can use data in the background. This may increase data usage.
- Observe companion device presence
  
  Allows a companion app to observe companion device presence when the devices are nearby or far-away.
- prevent phone from sleeping
  
  Allows the app to prevent the phone from going to sleep.
- modify or delete the contents of your shared storage
  
  Allows the app to write the contents of your shared storage.
- com.android.alarm.permission.DISMISS_ALARM
- set an alarm
  
  Allows the app to set an alarm in an installed alarm clock app. Some alarm clock apps may not implement this feature.
- org.avmedia.gshockGoogleSync.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
Download APK 4.9 MiB PGP Signature | Build Log
Version 42.9.4 (4294) - Added on Sep 14, 2026

arm64-v8a armeabi-v7a x86 x86_64

This version requires Android 8.0 or newer.

It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.
Permissions
- access approximate location only in the foreground
  
  This app can get your approximate location from location services while the app is in use. Location services for your device must be turned on for the app to get location.
- view network connections
  
  Allows the app to view information about network connections such as which networks exist and are connected.
- access Do Not Disturb
  
  Allows the app to read and write Do Not Disturb configuration.
- pair with Bluetooth devices
  
  Allows the app to view the configuration of the Bluetooth on the phone, and to make and accept connections with paired devices.
- access Bluetooth settings
  
  Allows the app to configure the local Bluetooth phone, and to discover and pair with remote devices.
- connect to paired Bluetooth devices
  
  Allows the app to connect to paired Bluetooth devices
- discover and pair nearby Bluetooth devices
  
  Allows the app to discover and pair nearby Bluetooth devices
- directly call phone numbers
  
  Allows the app to call phone numbers without your intervention. This may result in unexpected charges or calls. Note that this doesn't allow the app to call emergency numbers. Malicious apps may cost you money by making calls without your confirmation.
- take pictures and videos
  
  This app can take pictures and record videos using the camera while the app is in use.
- run foreground service
  
  Allows the app to make use of foreground services.
- run foreground service with the type "connectedDevice"
  
  Allows the app to make use of foreground services with the type "connectedDevice"
- have full network access
  
  Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.
- change your audio settings
  
  Allows the app to modify global audio settings such as volume and which speaker is used for output.
- 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.
- read the contents of your shared storage
  
  Allows the app to read the contents of your shared storage.
- record audio
  
  This app can record audio using the microphone while the app is in use.
- Companion Watch profile permission to manage watches
  
  Allows a companion app to manage watches.
- run in the background
  
  This app can run in the background. This may drain battery faster.
- use data in the background
  
  This app can use data in the background. This may increase data usage.
- Observe companion device presence
  
  Allows a companion app to observe companion device presence when the devices are nearby or far-away.
- prevent phone from sleeping
  
  Allows the app to prevent the phone from going to sleep.
- modify or delete the contents of your shared storage
  
  Allows the app to write the contents of your shared storage.
- com.android.alarm.permission.DISMISS_ALARM
- set an alarm
  
  Allows the app to set an alarm in an installed alarm clock app. Some alarm clock apps may not implement this feature.
- org.avmedia.gshockGoogleSync.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
Download APK 20 MiB PGP Signature | Build Log
Version 42.9.2 (4292) - Added on Sep 12, 2026

arm64-v8a armeabi-v7a x86 x86_64

This version requires Android 8.0 or newer.

It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.
Permissions
- access approximate location only in the foreground
  
  This app can get your approximate location from location services while the app is in use. Location services for your device must be turned on for the app to get location.
- view network connections
  
  Allows the app to view information about network connections such as which networks exist and are connected.
- access Do Not Disturb
  
  Allows the app to read and write Do Not Disturb configuration.
- pair with Bluetooth devices
  
  Allows the app to view the configuration of the Bluetooth on the phone, and to make and accept connections with paired devices.
- access Bluetooth settings
  
  Allows the app to configure the local Bluetooth phone, and to discover and pair with remote devices.
- connect to paired Bluetooth devices
  
  Allows the app to connect to paired Bluetooth devices
- discover and pair nearby Bluetooth devices
  
  Allows the app to discover and pair nearby Bluetooth devices
- directly call phone numbers
  
  Allows the app to call phone numbers without your intervention. This may result in unexpected charges or calls. Note that this doesn't allow the app to call emergency numbers. Malicious apps may cost you money by making calls without your confirmation.
- take pictures and videos
  
  This app can take pictures and record videos using the camera while the app is in use.
- run foreground service
  
  Allows the app to make use of foreground services.
- run foreground service with the type "connectedDevice"
  
  Allows the app to make use of foreground services with the type "connectedDevice"
- have full network access
  
  Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.
- change your audio settings
  
  Allows the app to modify global audio settings such as volume and which speaker is used for output.
- 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.
- read the contents of your shared storage
  
  Allows the app to read the contents of your shared storage.
- record audio
  
  This app can record audio using the microphone while the app is in use.
- Companion Watch profile permission to manage watches
  
  Allows a companion app to manage watches.
- run in the background
  
  This app can run in the background. This may drain battery faster.
- use data in the background
  
  This app can use data in the background. This may increase data usage.
- Observe companion device presence
  
  Allows a companion app to observe companion device presence when the devices are nearby or far-away.
- prevent phone from sleeping
  
  Allows the app to prevent the phone from going to sleep.
- modify or delete the contents of your shared storage
  
  Allows the app to write the contents of your shared storage.
- com.android.alarm.permission.DISMISS_ALARM
- set an alarm
  
  Allows the app to set an alarm in an installed alarm clock app. Some alarm clock apps may not implement this feature.
- org.avmedia.gshockGoogleSync.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
Download APK 20 MiB PGP Signature | Build Log

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