It works well for a basic meter, but for the $15 per month, at least have more customizations and at a minimum, allow different inputs to be selected aside from what is the system default. I need to monitor audio devices that may not be the default system device, and I also need to monitor more than one audio device simultaneously.

I'd like a tiny bit more functionality AND a good bit more visual customization. Keep it simple like it is, nothing too complex, but more colors, patterns, shapes, etc. would be super fun.

THIS IS NOT FREE. As soon as you launch the app, it presents you with a screen to sign up and pay. You can't get around it. It says "free trial for 3 days", but it auto-renews, therefore IT IS NOT FREE. There is no "minimal functionality" you get for free. You can't even use it unless you sign up for the premium. These apps that appear in the app store as "free" but force you to pay to use it should be reviewed more closely by Apple and removed.

This product claims to be free 'with in app purchases', but when you open it you can only access it if you purchase one of their subscriptions... which it tries to do automatically. This is a scam that should be removed from the app store. The people peddling this scam should be ashamed of themselves and each of them should go stick their head in a tiolet.