AI Dungeon

AI Dungeon is the pioneering AI text-adventure game from Latitude, originally built on GPT-2 in 2019 and now running on a rotating stable of large language models. Players type freeform actions, dialogue, or narration in Do/Say/Story modes, and the model continues the scene, remembers world details via a 'Memory' and 'Story Cards' system, and lets you spin off scenarios, characters, and full multiplayer adventures.

It sits closer to a creative-writing toy than a serious productivity tool, but it's the canonical example of LLM-driven interactive fiction and remains a useful sandbox for prompt-engineering experiments around persona, world-state, and long-context coherence. Pricing is freemium: a limited free tier with a weaker model and short context, then paid tiers (historically branded Adventurer, Champion, Mythic / Legend) in the roughly $10-$30/month range that unlock larger models, longer context windows, image generation, and faster turns.

The platform has cycled through controversies (filter changes, privacy incidents around stored adventures) and the 'best' underlying model varies as Latitude swaps in Mixtral, Llama, Hermes, and other open-weights backends. There is a community 'Scenarios' marketplace, image generation for scene art, and Discord-style multiplayer. No public API to speak of — this is an end-user product, not infrastructure.