CO FIT is a free Android app developed by Shenzhen Coding IOT Technology Limited. It is a companion app for the R4/SMA-R4 series watches. The app allows you to synchronize data such as steps, calories, mileage, sleep, and exercise records recorded by your watch.

The user-friendly interface of the app beautifully displays your data. You can also configure the watch's sedentary reminder interval, alarm clock, schedule, backlight, and weather synchronization using the app. Additionally, after binding and authorizing, the app will push phone call and text message content to the watch to ensure that you don't miss any key information.

CO FIT is a great app for anyone who wants to make the most out of their R4/SMA-R4 series watch. If you have any questions, the developers are available for support.