Arrow Speed Tracker Pro

Important! Make sure you try the functionality Demo version (also available on Google Play) before you purchase.
This app is designed to measure the average speed of an arrow during its flight. It functions by detecting two distinct audio events: the sound of the arrow being released from the bow and the sound of the arrow striking a target or backstop.
The app calculates the time interval between these two detected sounds. To determine the arrow's speed, the user is required to provide two distance measurements: the distance from the device running the app to the archer, and the distance from the archer to the target.