The software offers a free version that allows you to test connection and read basic information. This is great for verifying that your OBD2 adapter works.
Identify exactly why your "Check Engine" light is on.
You can find the official app on the Apple App Store and Google Play Store .
You are essentially giving an untrusted program access to your car’s electronic control unit (ECU). How to Get OBD Auto Doctor Safely
Instead of risking your hardware and data, you can use the official versions available directly from the developer: