Giri is a free Android app developed by Natural Style Co. Ltd. that allows users to measure the rotational speed of motors, such as drivable model cars. The app comes with several useful features.

One of the most notable features of Giri is its ability to remove noise, allowing for more accurate measurements. The app also includes a speed conversion panel, which makes it easy to convert between different units of measurement. Additionally, the memo panel allows users to take notes and keep track of important information related to their measurements.

To get the most accurate measurements, users should measure in a state of only motor sound and as close to the motor microphone as possible.

Overall, Giri is a useful tool for anyone looking to measure rotational speed, and its features make it a great choice for hobbyists and professionals alike.