OnBD2
OnBD2 turns your iPhone into a professional OBD-II diagnostic tool. Connect any ELM327 adapter (Bluetooth LE or WiFi) to access your vehicle's real-time info. It's an Apple Watch companion. View main car readings on your wrist, with the same parameters and order as your customized dashboard, support for Always On Display with low power mode, and continuous updates while the iPhone is connected to the vehicle. Get real-time data like RPM, speed, coolant temp, engine load, etc., up to 15 standard OBD-II parameters with continuous updates, real-time graphs, a customizable dashboard, and read stored and pending error codes.