Tuner app for tuning musical instruments with features like:
* Detect pitch based on autocorrelation and FFT spectrum.
* Accuracy improvement by evaluating the spectrum phase information and polynomial fitting.
* Show how pitch changes over time.
* Basic instrument database (chromatic guitar bass violin ...)
* Support for custom instruments
* Several temperaments like equal just Werckmeister Kirnberger ...
* Non-12-tone temperaments (EDO 17 19 ... 41 53)
* Scientific settings like FFT window size FFT window type overlap and more.
* Open source (https://github.com/thetwom/Tuner)
* Report bugs under https://github.com/thetwom/Tuner/issues