Only the current version so far — new entries appear as the app ships updates.
スピードガン is an entertainment app by PRONETS_Co.,Ltd. with 1,000+ downloads (about 2.2K estimated). Install growth, rank history, SDKs and ad networks.
From the store listing: “SpeedGun is based on the distance from the pitch catcher mound to home base, it is a simple application that displays the speed of the ball.”