The 長岡花火 公式アプリ is a travel and navigation app developed by Fuller Inc. It provides users with the latest information about the famous Nagaoka Fireworks Festival. The app offers a variety of features to enhance the festival experience, including an offline fireworks program, a map function with parking information and past traffic conditions, venue guidance, and entrance gate search. Users can also enjoy official videos and a photo gallery of the fireworks.

The app includes a home screen widget with a countdown to the fireworks display, as well as a Q&A section to answer common questions about the festival. Additionally, there is a countdown feature to keep track of the days remaining until the fireworks festival.