I have an OBDLink MX+ and the AlfaOBD software.
Both the OBDLink and AlffaOBD software paired just fine on my SUV, but so far, the OBDLink software hasn't paired on my challenger--only the AlfaOBD software has--which is fine since it has all the features I wanted, but not sure why the OBDLink app won't pair with it on my challenger also.