This is my favorite tuner now. It shows the full spectrum of the string, in the huge spiral spectrum that moves as you tune the string. It zooms into your tuning by showing a rotating hexagon that represents the tuning of your string with respect to the tuning reference. It makes it fun to perform intonation on your guitar or other instrument.
This is different from most anything you probably have ever used. You can use it to see what notes are in a chord, to see what notes are being played in a recorded song, and it is great for tuning.
Zargg, try running it inside a DAW, it always works there for me. I had some problems running it as a standalone app, but not recently. In Pro Tools it always works, probably Pro Tools drives the GPU/display differently.