Kolophon

Underfiction is an interactive storytelling app for web, iOS, and Android. You set a world, characters, and an opening, then direct each scene; the model writes it as prose rather than chat replies. You choose the text model per story from a catalog of open and frontier models, and can generate character portraits and short video clips. Stories sync across devices, are encrypted at rest, and export to a portable archive file. Credit-based, with no subscription.