Yes, there are multiple apps that can be used to check the speed of a vehicle. One example is the Speedometer+ app which uses the GPS on your phone to measure and track the speed of your car in real-time. Additionally, this app also records the average speed, maximum speed, and total distance traveled. Another option for an app to check vehicle speed is the AccuSpeed app which uses the accelerometer in your phone to measure your current speed as well as your top speed reached. This app also includes a map feature so you can see exactly where you were when you reached certain speeds.