Hi,
I just installed FreeOTP (version 1.5) and I thought I'd let you know there's a minor issue with the Camera view used for scanning QR codes.
On my device (Nexus 6p running Android 6.0) the camera view is upside down. On my old device (Nexus 4) the camera view is the right way up so I'm guessing its either an issue with Android 6.0 or specific to the Nexus6p.
Thanks, Dan.