Ukulele Tuner - Ukutuna II is a free iPhone app developed by Qiaochu Zhu. It falls under the category of Utilities & Tools and provides a convenient way to tune your ukulele.

The app utilizes your phone's microphone to listen and analyze the sound in real time. It can accurately recognize which string you are playing and indicate if the string is too low or too high. This feature allows for precise tuning of each string, ensuring optimal sound quality.

Additionally, Ukulele Tuner - Ukutuna II offers a manual mode where you can press the buttons corresponding to each string on the app. This allows you to focus on tuning one string at a time. Once you have successfully tuned a string, you can press the next button and move on to the next string.

With its user-friendly interface and real-time analysis, Ukulele Tuner - Ukutuna II provides a practical solution for ukulele players of all skill levels to easily tune their instrument.