Chromatic Tuner is a free Android application developed by Emil Doležal that provides accurate and fast tuning for all music instruments and even human voice. It covers a wide range from C0 (16Hz) to B8 (7902Hz). The application plots sound waves and frequency spectrum in real-time, making it easy to tune instruments or voices.

The application offers several features, including tuning modes, real-time wave plotting options, sensitivity calibration, A4 calibration, frequency precision settings, refresh rate settings, and note-naming convention settings. The tuning modes include guitar (E2, E4), violin (G3, E5), viola (C3, A4), cello (C2, A3), bass (E1, G2), piano (A0, C8), human voice (C2, D6), and max frequency range (C0, B8).

The pro version of Chromatic Tuner contains no ads or nag screens, making it a great option for musicians and vocalists who want to tune their instruments or voices accurately and quickly. Overall, Chromatic Tuner is a useful and reliable tool for musicians of all levels, offering a wide range of features and tuning options.