RPM and Speed Tachometer is a free Android app developed by CirCle Game that allows you to monitor your motor's RPM and speed through GPS. The app is designed to show the motor RPM based on the engine sound and speed through GPS. To use the app, you need to indicate the motor type first.

The app's interface is simple and easy to use, making it accessible even for those who are not tech-savvy. The app provides accurate readings of the motor RPM and speed, making it useful for drivers who want to monitor their vehicle's performance. However, it is important to note that the app should not be used while driving to avoid distraction and ensure safety on the road.

Overall, RPM and Speed Tachometer is a great app for those who want to keep track of their motor's RPM and speed. It is free, easy to use, and provides accurate readings.