gStrings is a chromatic tuner application measuring sound pitch and intensity. This is the ad supported version.

It will let you tune any musical instrument (violin viola violoncello bass guitar piano wind instruments your own voice/singing).

Features include:
1. multiple built-in instruments and tunings
2. support for user-defined custom tunings
3. a long list of built-in temperaments (just pythagorean meantone comma etc.)
4. support for user-defined custom temperaments
5. orchestra tuning (shifting/redefining tone frequencies)
6. pitch pipe
and many more.

If you were looking for a guitar tuner try it!

(*) the INTERNET permission is used for ads only.

(**) most of the historic temperaments were included courtesy of NetCat AG.