A free app for Android, by Dmitry Yablokov.

Smart Speedometer Free is an application that allows you to check the speed and G-force of your vehicle. It is useful for tracking the history of your speed and G-force, and for comparing the values with those of other vehicles.

This app can be useful for many reasons. First, it is very simple to use, so you do not need to be an expert to get the information. Second, it is not necessary to place your phone in a specific position, and the information can be obtained regardless of the position of the device. Third, the application is completely free, with no ads, and the usage is very simple.