G-Tuner is a free Android app developed by nobapp that specializes in tuning plucked string instruments like guitar, bass guitar, and banjo. The app offers a pitch detection technology that reduces the influence of noise and ensures smooth tuning. G-Tuner boasts a high level of accuracy and responsiveness that can be used in professional applications. The user-friendly interface is perfect for both beginners and advanced users, and it also offers practical options to meet advanced requirements.

The app's specifications include a pitch accuracy of ±0.1 cents at 440 Hz, pitch range of E0 to E7, calibration range of 390 to 490 Hz, FLAT/CAPO (shift tuning) of -5 to +7 frets, and two display modes: strings mode and chromatic mode. Tolerance setting is available in MED (in-tune = ±5.0 cents) and HIGH (in-tune = ±2.5 cents) and altered tuning options are available for guitar, bass guitar, banjo, mandolin, and ukulele. Other features include in-tune notification, tuning state indication for each string, and detailed pitch information. A 30-day free trial is offered for advanced options.