Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
http://phandroid.com/2015/11/18/google-camera-3-1-update-download/
That's the app being referred to I suspect.
My main beef with any of the Google Camera app versions on any device I've had is the length of time it takes to take the photo after pressing the shutter button. More often than not (especially when taking pics of my kids), you press the button, wait a second or 2 and the moment is gone.
I suppose it's device dependant a little, but has it improved? The stock camera app on the G4 is nearly instant.