I was initially excited to see that app because it supposedly utilized digital processing to analyze the sounds coming from your acutal guitar instead of relying on clicking images on the screen.
The first exercise worked OK, but for every subsequent execise, it stared blankly back at me and didn't respond to my notes.
Yes, my guitar is in perfect tune, using both my own strobe tuner, as well as the tuner built-in into GuitarBlast . Yes, I am using ample volume for the Macbook microphone to pick up the sound. Yes, I'm using clean tones without any effects that could alter pitch. Yes, I have a top-notch M2 Macbook Pro with the latest release of MacOS. So no, it's not "my setup" - GuitarBlast simply DOES NOT WORK.
Looks like I can kiss 4 bucks goodbye...