DT78 appDT78 is Connectivity tool that is open source under the MIT license.
DT78 is an alternative app for the DT78 Smartwatch. Also works with DT92 & DT66. May work with other watches that use the WearFit 2.0 app.
The camera may not work on some devices and on others only the back camera may work. Rooted users can long press to switch between In-app or External camera.
Note: This app has been officially deprecated and a successor was named, so you won't see any updates here anymore. Unfortunately, the successor seems not to be F/LOSS (I could not find its repository).