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.

• 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.

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

Note: While these watches connect, not all specific hardware features (like fitness tracking steps on GBD models) may be fully supported yet.

Here is a guide to the main screens of the application.

This is the first screen you see. It handles the Bluetooth connection to your watch.

• Status: Shows generic connection status.
• Scan/Connect: Automatically scans for your watch.
• Paired Devices: Lists your previously connected watches for quick access.

The app communicates directly with the watch via BLE. Connection is typically much faster than the official app (~3.5s vs 12s).

Manage your watch's timekeeping effortlessly.

• Local Time: Displays the current time from your phone.
• Send to Watch: Tap the button to sync your phone's time, timezone, and DST settings to the watch immediately.
• Home Time: Shows the 'Home' city configured on the watch.
• Battery: Displays the current battery level of the watch (e.g., High, Medium, Low).

Read and configure the alarms stored on your watch.

• View Alarms: See the current settings for all 5 alarms and the hourly signal (Chime).
• Edit: Tap any alarm to change its time.
• Sync: You can send these alarm settings to the watch.

Note: Due to Android limitations, we cannot read alarms set in your phone's native Clock app, but we can set the watch's internal alarms.

Sync your Android calendars to your watch!

• Upcoming Events: Lists future events from your phone's calendars.
• Send to Watch: Pushes these events to the watch's Reminder feature.
• Compatibility: Supports standard Android calendar events. Complex recurrence rules might show as "Incompatible".

The watch will display these as reminders with the date and title.

Turn your watch into a remote control. Assign actions to button presses on the watch.

• Available Actions:
  • Find Phone: Make your phone ring loudly.
  • Take Photo: Snap a picture with your phone's camera.
  • Flashlight: Turn on your phone's flashlight.
  • Next Track: Skip music tracks on your phone.
  • Voice Assist: Launch Google Assistant.
  • Set Prayer Alarms: Set the watch's 5 alarms to Islamic Prayer Times
• How to use: Short-press the lower-right button on the watch (when in Time mode) to trigger the selected action.

Note: The Take Photo action requires the app to be in the foreground. If the app is in the background, the action will not work.

Configure app and watch preferences.

• Watch Settings: Adjust specific watch configurations (light duration, power saving, etc.).
• App Settings: Configure theme, behavior, and advanced options.

• F-Droid: Download here
• GitHub: Download APK from Releases

We welcome contributions!

• Code: Submit a PR to add features or fix bugs.
• Watches: If you have a G-Shock model not yet supported, functionality can often be added. Donations of test units are also highly appreciated to help expand compatibility.

This project is licensed under the MIT License - see the LICENSE file for details.