You can use this application to tune a classical acoustic guitar.
A tone frequency measurement algorithm ensures the high accuracy of 0.01% (0.2 cents) for all tones being tuned.
The graphic user interface includes an oscilloscope and a spectrum analyzer of the sound signal, an easy-to-use and intuitive indicator tuning meter and the tone frequency visualization graph.
1. An Android device with an arm processor that supports NEON extensions instruction set.
2. An Android device that is able to capture sound with 16 bit 48000 sps format.
3. Operation System Android 4.2 or higher.
The application is freeware and distributed under the "Google Play Terms of Service."