Bluetooth Low Energy: phones and laptops
Works in Chrome on Android, and in Chrome or Edge on Windows, macOS and ChromeOS. Look for “Bluetooth 4.0”, “Bluetooth LE” or “BLE” in the description. You don’t pair it in your phone’s settings: the page asks for it when you press Connect.
Classic Bluetooth: laptops only
Older adapters that you pair with a PIN work on a laptop in Chrome or Edge, once they’re paired in the computer’s Bluetooth settings. Choose “Connect USB adapter” on the check page and pick the adapter from the list. Phones need a BLE adapter.
USB: laptops
Works in Chrome or Edge on a laptop. On Windows the adapter may need its USB driver installed first.
Wi-Fi: not supported
Browsers can’t open the kind of network connection Wi-Fi adapters use, so these only work with their own apps.
Models we’ve tested
None yet: we’re testing specific adapters on real cars now and will list the ones we’ve confirmed here. Until then, any ELM327-compatible BLE adapter should work. If yours connects but doesn’t answer, the check page tells you what went wrong.
On iPhone
iPhone and iPad browsers can’t use Bluetooth. Read the car with any scan app that shows Mode 09 vehicle information, then type the CAL ID and CVN in.
For the technically curious
BLE adapters carry the serial line over two GATT characteristics. The page recognises the layouts used by common adapters: services FFF0, FFE0, 18F0 and the Nordic UART service. It sends standard ELM327 commands (ATZ, ATSP0, ATH1 and so on) followed by OBD-II requests from modes 01, 03, 07, 09 and 0A.