Zetter (ゼッター) is a Japanese-language social platform that combines AI character chat with a public timeline for sharing everyday thoughts and updates. Users can browse public characters, called casts, and start conversations, or create their own original characters. The service is accessible through a web browser on smartphones and computers.

Alongside its character-chat features, Zetter presents itself as a casual daily social network: a place to post about ordinary moments and opinions, discover other users’ public posts, and interact through familiar social features such as profiles, notifications, bookmarks, search, and replies. Its stated aim is to offer a relaxed space for everyday conversation, reminiscent of early Twitter.

Zetter also provides account registration and sign-in options, including Google sign-in, as well as settings, privacy information, community guidelines, support, and contact channels. Its interface includes sections for the home feed, talks, character creation, and personal profiles, bringing social posting and AI-powered conversations together in one service.