Recommended iOS Apps: OBD Fusion, DashCommand, Car Scanner ELM OBD2 (free), OBD Auto Doctor, FourStroke (free), OBD Car Doctor, EOBD Facile, etc. Using this OBD2 diagnostic software a user can interact with a car's OBD2 system readily, and make a computer or a laptop with OS X a very. The Auto Doctor allows the user to examine and reset the alert codes. It is one of the best OBD software for the OS X platform. OBD2 Auto Doctor is an advanced OBD2 car diagnostics tool.