Casio G-Shock Smart Sync is described as 'This app integrates the Casio G-shock square digital Bluetooth watches (B5600, B5000 series), with Google services such as Google Calendar events and Google Alarm Clock. It also works as a remote control for your phone. It is not meant to replace the official Casio app' and is an app. There are more than 25 alternatives to Casio G-Shock Smart Sync for a variety of platforms, including iPhone, Android, iPad, Apple Watch and Linux apps. The best Casio G-Shock Smart Sync alternative is Gadgetbridge, which is both free and Open Source. Other great apps like Casio G-Shock Smart Sync are Fitbit, watchOS, Garmin Connect and Wear OS.