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gStrings is a chromatic tuner application measuring sound pitch and intensity.

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.

From version Tuner - gStrings Free 2.3.3:

Android 10 compatibility update

(Android 2.3+)
Latest: 2.1.0 on April 12, 2016
(Android 4.1+)
Latest: 2.3.3 on October 30, 2019
All versions
October 30, 2019