세벌식 한글 입력기 (OpenWnn Korean) is a Korean input method based on the Japanese input method OpenWnn. It focuses on providing basic input functions without collecting users' personal information. The app displays a warning message during keyboard setup, which is standard for all keyboard apps on Android.

The main features of this input method include support for 26 Korean keyboard layouts, with the possibility of adding more upon request. It also supports English QWERTY, DVORAK, and COLEMAK layouts. Flick input is supported, allowing users to insert upper keys or symbols by sliding the key in different directions. The app allows separate layout settings for the soft keyboard and the hardware keyboard, with a PC layout option available for tablet PCs.

Users can also utilize the three-beol-sik layout to use a moa-gi, and even limited simultaneous stroke with multi-touch from touch input. The app supports old Hangul input and offers 6 themes to choose from.

Overall, 세벌식 한글 입력기 (OpenWnn Korean) provides a comprehensive and customizable Korean input method for Android users, with various layout options and additional features to enhance the typing experience.