Add smart functions to your Casio square BT G-Shock Watch.
About this app
Casio G-Shock Smart Sync
What is it? ----------- This is an unofficial app for Casio 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 check ------------------ - 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 Watches ----------------- The app works with many Bluetooth-enabled G-Shock, Edifice, and Pro Trek models.
- Square: GW-B5600, GMW-B5000, GW-5000, DW-B5600 - CasiOak: GA-B2100, GBM-2100 - G-Steel: GST-B500, GST-B400, GST-B200 - Edifice: ECB-10, ECB-20, ECB-30 - Others: GBD-800, GBD-H1000, GG-B100
Note: While these watches connect, not all specific hardware features (like fitness tracking steps on GBD models) may be fully supported yet.
App Walkthrough ---------------
1. Connection Screen 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. Connection is typically much faster than the official app (~3.5s vs 12s).
2. Time Setting 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.
3. Alarms 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.
4. Events (Calendar Sync) Sync your phone's calendar to your watch! - Upcoming Events: Lists future events from your phone's calendar. - Send to Watch: Pushes these events to the watch's Reminder feature. - Compatibility: Supports one-time and simple recurring events. Complex recurrence rules might show as "Incompatible".
5. Actions (Remote Control) Turn your watch into a remote control. Assign actions to button presses on the watch. - Find Phone: Make your phone ring loudly. - Take Photo: Snap a picture with your phone's camera. - Next Track: Skip music tracks on your phone. - Voice Assist: Launch Google Assistant. How to use: Short-press the lower-right button on the watch (when in Time mode) to trigger the selected action.
6. Settings Configure app and watch preferences. - Watch Settings: Adjust specific watch configurations (light duration, power saving, etc.). - App Settings: Configure theme, behavior, and advanced options.
Where are my World Cities? -------------------------- Using an app to manually swap between Home Time and World Time is a bit silly. Your phone already knows where you are. When setting time, this app will also set the Home Time, Timezone, and DST state to your current location. So when travelling to another timezone, just set time and you are good to go.
Build Your Own App ------------------ For those who want to build their own Android app for interfacing with the G-Shock 5000/5600 watches, I have also created an API (library) project here: https://github.com/izivkov/GShockAPI.
Similar Project --------------- If you'd prefer not to use a mobile app but still want to set the correct time on your G-Shock, check out this Python project which can run as a server on a PC or Raspberry Pi: https://github.com/iziv
Licensed under MIT, by Ivo Zivkov.
What's New in v42.5.1
Imported from the F-Droid repository index.
Version history
Jul 15, 2026 · 20.3 MB · Android API 26–36 · code 4251
Imported from the F-Droid repository index.
SHA-256 aaa28c7fa79807cc68cf285d4acdb95fc1d17c606c0ae644f33f228a33b37dd7
Jul 14, 2026 · 20.3 MB · Android API 26–36 · code 425
Imported from the F-Droid repository index.
SHA-256 c08256fff33f97ac4bad2d4928d370f0a8d8a8928f17b4a276eaf9200a93dd0b
Jul 10, 2026 · 20.4 MB · Android API 26–36 · code 424
Imported from the F-Droid repository index.
SHA-256 ff813b70f4e2cc1585a0a702aa1134bf9a57c63e444c76b559ccf2348b02acc0
Will it run on your device?
92%
- Runs on a broad range of modern Android versions.
- Multiple CPU architectures are covered.
- Aligned with the latest Android target SDK expectations.
Installation Guide
Open Settings on your Android device
Go to Security → Unknown sources (or Install unknown apps)
Enable "Allow from this source" for your browser or file manager
Open the downloaded APK file from your Downloads folder
Tap "Install" and wait for installation to complete
Launch the app from your home screen
Make sure to re-enable Unknown Sources restrictions after installation for security.
How to install this safely
How to verify the file you downloaded
Before you install anything, confirm the file is the one described here. On a computer, run shasum -a 256 your-download.apk (macOS or Linux) or certutil -hashfile your-download.apk SHA256 (Windows), then compare the output character-for-character with the SHA-256 on this page. If a single character differs, the file is not the build we recorded — delete it.
What the signing certificate proves
Every Android app is signed with a private key that only its developer holds. The fingerprint on this page is a hash of the matching public certificate, and it proves continuity rather than identity: it tells you a build came from whoever signed the earlier ones. Android enforces this at install time — if a package claiming to be org.avmedia.gshockGoogleSync is signed with a different key, the system will refuse to install it over your existing copy. A fingerprint that changes between releases is worth pausing on, because a repackaged app that has been modified by someone else cannot keep the original signature.
How to roll back to an earlier version
If the current release misbehaves, 42.5 is the last build before it. Android will not install an older version code over a newer one, so you must uninstall Casio G-Shock Smart Sync first — which clears its local data unless you have a backup. Reinstall the older APK only if its signing fingerprint matches the build you already trust, and check the API range: an older release may target an Android version your device has moved past.
Why we list sources instead of hosting everything
The official store channel is almost always the right choice: it updates automatically and carries the publisher's own distribution guarantees. A direct APK is useful when a device has no store access, when a rollout has not reached your region, or when you need a specific version — and only when the publisher has authorized that copy. APKBrowse does not list pirated, cracked, or unauthorized rebuilds of Casio G-Shock Smart Sync, and a listing is removed when the evidence for it stops holding up.
Get Casio G-Shock Smart Sync
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Other sources
F-Droid listing
officialF-Droid builds this app from source and signs it. This is its official listing, with older builds and full release notes.
Source code
verified publisherThe upstream repository this build is compiled from.
We check legality and signature continuity, but device behaviour still varies. Install at your own discretion.
App Information
Security Verification
We record provenance; we do not run malware scans. Verify the hash yourself before installing.
SHA-256 Hash
aaa28c7fa79807cc68cf285d4acdb95fc1d17c606c0ae644f33f228a33b37dd7
Signing certificate
d921d6eff00e97108b2a3323c0eb268918020fa1353fe0211abb7745758ce46f
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Previous Versions
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