京急線アプリ is a free official app offered by Keikyu Corporation, providing essential information for railway travel. With its push notification feature, the app keeps customers informed about train operation updates. It also offers departure information for each station based on the current time.

In addition to the regular transit guidance, the app introduces a unique feature called "Traveling on a Relaxed Train." This function caters to the need of passengers who prefer less crowded trains, allowing them to search for results that include only "Local" and "Airport Express" trains. Although it may take longer, it provides valuable information about the travel time when utilizing less crowded trains.

Furthermore, the app is integrated with the seat reservation website, "KQuick," enabling users to check the availability of seats on the Morning Wing and Wing trains.

With services ranging from departure information and operation updates to station maps and delay certificates, the Kyoto Line app is a comprehensive travel companion for Keikyu Line passengers.