If you're looking for a simple and easy-to-use subway map app in Seoul, then '효도 지하철 for 서울' is the perfect choice. Developed by Sungpil Jang, this app aims to help the elderly navigate the subway system with ease.

The app features a large font size, making it easy to read for those with visual impairments. It also offers both map and list views of subway routes, making it convenient for users to find the best route for their destination. In addition, the app displays arrows on the map view, indicating the direction of travel for each route.

For those who want real-time arrival information, the app provides a direct link to the official subway website. Lastly, the app also includes the subway schedule, allowing users to plan their trips ahead of time.

Overall, '효도 지하철 for 서울' is a great choice for anyone looking for a simple and user-friendly subway map app in Seoul.