Entropy Piano Tuner is a free and open source piano tuning application for Linux, Windows, MacOS, ios and Android. Using this application you can tune your Piano by new entropy method. In Entropy Piano Tuner it uses Monte-Carlo algorithm. According to its website, it records all keys of the piano and determines the spectra of their higher partials (overtones). These power spectra are filtered, added up and used to compute the entropy. It works as a below simple 3 steps. 1.recording of the keys 2.minimization of entropy 3.tuning based on computed pitches. It is released open source GPL-3.0+ license.