Smiley Tuner is a free app available on the iPhone platform, developed by Yasar Bozdag. It falls under the category of Multimedia and specifically belongs to the Music & Radio subcategory.

This app provides users with the ability to tune their guitar, bass, and ukulele with a high level of accuracy, up to 0.01Hz of sensitivity in a silent room. The tuning process is simple - just bring the indexes to the center within the green area, and you're in tune.

One of the standout features of Smiley Tuner is its extensive range of tuning options. It offers more than 50 types of guitar tuning, including drop, open, and more. For ukulele enthusiasts, there are 9 types of tuning available, such as tenor, soprano, and baritone. Bass players can choose from 8 different tuning options, while banjo and mandolin players have 6 and 7 tuning options respectively.

The app also offers both auto and manual string selection, allowing users to customize their tuning experience. Additionally, it provides octave and tone approach indexes, making it easier to achieve the desired tuning. In manual string selection mode, Smiley Tuner even warns users about strings that are too tight and may break.

For those looking to enhance their sound, the app features a phoneAmp amplifier with common studio effects and a recording feature. And for musicians who need to keep time, there is a built-in metronome with the ability to group beats.

Smiley Tuner offers a one-time payment for extra features, ensuring there are no subscriptions or auto-renewals to worry about. With its accurate tuning capabilities and extensive range of options, this app is a valuable tool for musicians of all skill levels.