Credit where it's due: AI Dungeon invented this category in 2019. Everything since — including Underfiction — stands on that. And Latitude has done genuinely respectable things recently, like open-sourcing a whole family of storytelling models (Wayfarer, the "AI that lets you fail," among them) for anyone to use.

But if you typed "AI Dungeon alternative" into a search bar, you already have your reason. In our experience it's one of three.

Reason one: memory

Memory has been AI Dungeon's longest-running complaint. Memory Bank helps, but open-ended adventures still lose the plot — details drift, characters forget what happened, and the burden of keeping the story coherent lands on you.

Underfiction structures stories as scenes, like chapters. When a scene ends, it's summarized and the summary carries forward. Long scenes compress automatically in the background. You pay for the prose, never for the summaries or compression. Stories run fifty scenes without the narrator losing track of who knows what.

Reason two: the models

AI Dungeon runs a mix of in-house finetunes and third-party models that varies by subscription tier. Some of them have real character — Wayfarer's willingness to let your hero fail is a genuinely good design decision. But none of them are frontier models, and adventure-tuned output reads like an adventure game: reactive, terse, game-master-ish.

Underfiction runs Claude, Gemini, and Grok through Venice, prompted for literary prose — scene-setting, interiority, subtext. You can switch models mid-scene and compare for yourself.

Reason three: what does a tier actually buy?

AI Dungeon's subscriptions stack credits, model access, and context size in ways that are famously hard to reason about. The recurring question in every community thread: how many turns does my tier actually get me this month? If you have to ask, the pricing has failed you.

Underfiction has no subscription. You buy credits, each model shows its price, and you watch exactly what a scene costs as you write it. Credits never expire, so a month off costs you nothing.

Privacy

AI Dungeon learned its privacy lessons in public in 2021 and reformed honorably — unpublished stories are no longer human-moderated, and they dropped the provider that forced the issue. But your adventures still live on their servers.

Underfiction stores stories locally by default. There is no server copy unless you turn on Story Sync, and synced copies are encrypted at rest. Inference goes through Venice, which separates your identity from your prompts. It's a structural answer, not a policy promise.

Underfiction is web, iOS, and Android. Stories are local by default; sync is optional and encrypted at rest. New accounts start with 500 free credits.