this thing is amazing. works well with ios 11 , app OBD fusion. if you add up the 40$ for the scanner, plus $13 app, you are still better off than some expensive scanners out there. not to mentioned the app gives you a lot feedback... including diagnostics, but also performance. there's even a map that records your driving (meaning slow, medium and fast speed) so you can analyse that. had a little bit of issue connecting, but it was just because i was in my drive way so my iphone was having a boxing match with the obd2 scanner on which wifi it was going to connect, house or obd2 as for ios it connects wifi.... once i got the wifi router disconnected it connected via the app. DO NOT PAIR BLUETOOTH, simply use the app and follow the instructions.