カラ鉄ホーダイ is the official app for the monthly subscription service offered by Karaoke no Tetsujin. For a fixed monthly fee of 1,650 yen (including tax), users gain access to a passport feature allowing them to use the service once a day at Karaoke no Tetsujin outlets. The app includes features such as store locator, latest information on new outlets, and promotional campaigns.

The app offers a passport feature where users can pay 1,650 yen monthly within the app to enjoy a daily visit to Karaoke no Tetsujin outlets. Users can also search for store locations, operating hours, and view new store information and promotions.