Car diagnostic tools are device that able to plug into the OBD connector to access OBD functions. These range from simple generic consumer level tools to highly sophisticated OEM dealership tools to vehicle telematic devices, including hand-held car scan tools, Mobile device-based tools and PC-based scan tools. Most of these car diagnostic tools are designed for one or more car makes while some for all cars.
INPA vs ISTA+ (Rheingold) is a hot topic on BMW forums all the time. It’s a write-up of opinions collection of “how to people think of INPA and ISTA+”.