I am not blind  but I was curious and I tried the app using the phone with the eyes closed. Although I can't give a consistent opinion about the functionality  because I didn't use it for a long time  I can suggest that you add a feature that recognises languages so the robot can read the text properly. I am constantly reading and writing in Portuguese and English and I found that this might be difficult for blind people to do if this app doesn't have this feature.
January 28 2017