This app requires root prior to Android 5.0.
Fire TV instructions:
On your FireTV, Download AllCast Receiver for Fire TV and start the application
No setup necessary!
Download AllCast Receiver from the Chrome web store and start the application
NOTE: Chromebook is NOT supported.
Can't find the Receiver? Adjust your firewall settings to allow UDP/TCP ports 53515.
Android to Android mirroring:
Download AllCast Receiver from the Google Play store and start the application