DIANA - ダイアナ公式アプリ is a free lifestyle app developed by DIANA Co. Ltd. for Android users. The app is designed specifically for members of DIAMO, providing them with a variety of features and services. With this app, DIAMO members can access their membership card, check their "ダイアナポイント" balance, and browse the latest items available in DIANA stores and web shops.

The app also includes a shop list feature, allowing users to easily find DIANA stores near them. Additionally, DIANA - ダイアナ公式アプリ provides exclusive "ファッションコラム" articles that can only be accessed through the app. Users can also follow their favorite shops to receive the latest news and updates, and take advantage of the app's coupon feature to save money on their purchases. Overall, DIANA - ダイアナ公式アプリ is a comprehensive lifestyle app that provides a variety of useful features for DIAMO members.