Since 2015, Orfox has been the only mobile app recommended by the Tor Project to utilize the privacy protections of Tor on Android. The Tor Project has launched an official browser, Tor Browser for Android, now in its alpha release. Orfox will be sunsetted by early 2019 when the stable Tor Browser for Android comes out.
This download is completely safe. The Tor Project has developed this application that lies within the Communication category. The app was downloaded and set up by over 10M users and its latest stable update was on Jul 2, 2018.