Casio G-Shock Smart Sync for Android

Casio G-Shock Smart Sync

Ivo Zivkov

version 40.9

Add smart functions to your Casio square BT G-Shock (B5600, B5000, B2100)

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Antivirus & safety scan results

Scan Date: Apr 30, 2026 Software Version: 40.9
Status: ✅ Trusted & Safe to install This app is signed by Ivo Zivkov with trusted and verified digital signature and it will updated existing Casio G-Shock Smart Sync installations Certificate fingerprint: e4c473290670eb4773ef411ea47b894fd759654f Issuer: C:UK, CN:FDroid, L:ORG, O:fdroid.org, ST:ORG, OU:FDroid How we verify APK files security
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Casio G-Shock Smart Sync Connectivity app for Android description

Note: We now support the B2100 series of G-Shock watches!

I think we can do better than the official G-Shock Connected App! This app provides the following extra features:

  • Sets watchs reminders from Google Calendar
  • Automatically sets correct timezone when travelling. No need to switch between Word Time and Home time
  • Use your watch to trigger actions on your phone remotely, like taking pictures, dialling a phone number, etc.
  • Auto-configure most watch settings from phones configuration.
  • Phones alarms can be synced with watchs alarms.
  • Super fast connection time: 3.5 seconds vs 12 seconds for the official app.

The supported watches B500, B5600 and B2100 series:

General

The app works by sending commands to the watch via Bluetooth (BLE). The watch data is not persisted on the phone, but instead is read from the watch each time a connection is established. Any changes on the app are sent back to the watch, only when the Send to Watch button is pressed.

Setting Time

The local time can be set from the main screen by pressing the Send to Watch button next to the current time display. The app uses your current location to get the local lime. You can then set the watch time accordingly, without having to change your World Time selection on the watch.

This screen also shows your Home Time location and battery level.

Alarms

The B5600/B5000/B2100 watches have 5 alarms and a Signal or chime setting. They are first read from the watch, and displayed in the app. The alarms can be updated by pressing on the time display of each alarm. A dialog will appear which allows you to select the time.

Once the alarms have been set, you can send them to the watch, or send them to the Alarm Clock app on the phone. Unfortunately, there is currently no way to read the alarms from the AlarmClock app programmatically, so we cannot set the watch alarms from this app. However, we can set the Alarm Clock app with the watchs alarms.

Events

Make sure you have set your phone to auto-sync to your google account. Otherwise, adding events in your phone will not be reflected to the Google account, and you will not be able to see the events in the app.

This screen displays Events from your Google Calendar and allows you to send these events to the watchs reminders. (dont confuse these with reminders in the Google Calendar app. These reminders are special features and are not accessible programmatically).

There are many ways to set calendar events in Google Calendar. Events could be one time, repeating daily, weekly, monthly or yearly, or some complex period such as every second Thursday of the month. There are also events which occur number of times only (count events), like repeat this event 12 times every Monday. Not all event types can be supported on the watch, but this app attempts to adopt the calendar events to the watch as much as possible. The only not supported event types are daily and complex events, such as every second Thursday of the month. Count events are simulated on the watch with a start and end date, matching the event start time, count and frequency. In case the calendar event cannot be adopted to a watch reminder, the app will display the event as Incompatible. Only future events and recurring events which have not expired are displayed.

The watch only supports all-day reminders. However, if the Google calendar event has a specific time, it will still be used as a day reminder on the watch.

Actions

The selected actions are run when the user short-presses the lower-right watch button from disconnected mode (initial screen).

Using these actions, the watch acts like a remote control for your phone.

Build Your Own App

For those who want to build their own Android app for interfacing with the G-Shock 5000/5600/B2100 watches, I have also created an API (library) pro

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Specifications


Old Versions

Casio G-Shock Smart Sync icon

40.4 APK

April 10, 2026

Casio G-Shock Smart Sync icon

40.2 APK

March 13, 2026

Casio G-Shock Smart Sync icon

27.6 APK

February 19, 2026