Seoul Metropolitan Subway is a free Android app developed by Crispysoft under the Travel and Navigation category. It offers a quick view of the metropolitan subway maps of six major cities in Korea, including Seoul, Busan, Daegu, Gwangju, Daejeon, KTX, and SRT. The app provides a comprehensive and up-to-date subway map that is easy to navigate, making it an excellent tool for travelers.

The app's user-friendly interface allows travelers to find their desired station or route quickly and efficiently. It also supports an English version of the map, making it easier for foreigners to navigate the subway system. The app boasts of many good functions that are continuously being improved by Crispysoft. The subway map images are sourced from the respective subway authorities of each city, ensuring accuracy and reliability.