Guzheng Tuner is a free iPhone app developed by Hai Lin that is specifically designed for Guzheng players. This comprehensive tuning app offers a range of algorithms to ensure the best tuning experience for Guzheng players.

One of the standout features of Guzheng Tuner is its support for not only the D key but also 15 other keys. This makes it a versatile tool that can be used by Guzheng players of different levels and preferences. Whether you are a beginner or an advanced player, this app has got you covered.

The app is incredibly easy to use, making it accessible to both beginners and experienced players. With its intuitive interface, users can quickly and accurately tune their Guzheng instruments without any hassle. Whether you are performing on stage or practicing at home, Guzheng Tuner is a reliable companion to help you achieve the perfect tuning for your instrument.