Won’t launch after first launch

It launched fine the first time. I was testing its response against a tuning fork, and it reported the fork to be in tune sometimes, and sharp or flat at others. Not a good sign. Upon closing the app, I was unable to launch it again. It appears to launch and immediately crash. There is no minimized window as one reviewer had said. If I have to restart my Mac, and all the many other applications I have open, it isn’t worth it.

madtowncyclist about insTuner - Chromatic Tuner for Guitar, Ukulele and String Instruments