東武線アプリ, developed by TOBU RAILWAY CO. LTD., is a comprehensive railway app that offers a range of useful features for users of the TOBU Railway. The app provides train departure information from user-designated "frequently used stations," allowing users to easily plan their journeys. Users can also customize the background image of the app with preset images or their own saved images.

The app also includes a notification feature that alerts users to delays or service suspensions on various TOBU Railway lines. Users can choose to receive push notifications for specific routes of interest. Additionally, the app provides real-time train location information, allowing users to track the progress of trains on their routes.

Other features of the app include the ability to display delay certificates issued by TOBU Railway, search for transfer routes and fares, access timetables, and view train-specific and car-specific congestion information for select sections of the railway during weekdays.

Please note that 東武線アプリ has been discontinued and users are encouraged to use the TOBU POINT app for similar content and services.