OBD Boy is a free Android app developed by Nitramite for car diagnostics. It is an OBD2 ELM327 application that is currently in progress but can't mess up your car since ELM327 can't write anything to your car's communication networks. The developer started making this app due to his own car's weird problem.

The app offers gauges, reads and clears trouble codes, and has a trouble code description search feature with permission from obd-codes.com. It also has a console that allows you to mess with AT and PID commands and do anything you want. Additionally, you can download and see more features.

The app requires an internet connection, Bluetooth, and vibrate permissions, but no identity-related or non-sense permissions. If the app does not connect or work with your car or adapter, the developer requests that you do not give a one-star rating or throw "junk" comments, but instead tell them what is happening so they can get real testing data to work with.

Overall, OBD Boy is a useful app for car diagnostics and offers a variety of features that can help you with your car's issues.