FinalCam works for me
FN cam also works
you can add
Fusion Next on the list, also works
There is also CameraFi which is a very interesting OTG app.
You can also connect to the WiFi of the camera directly and send commands and view it.
And beside all of this you can use the RF remote
You already have something like 5-6 free apps on the market that already WORK with the Git1 and also the Git2. This is an action camera, i seriously doubt that those who do "action videos" with it also use a smart phone with it.