Features include:
1. orchestra tuning (shifting/redefining tone frequencies, e.g. A440 > A443),
2. different temperaments (pythagorean, bagpipe, etc.),
3. custom user-defined temperaments,
4. different note namings (English, Latin, Hindustani),
4. a nonlinear scale,
5. pitch pipe.
If you were looking for a guitar tuner, try this!