AI Dungeon
AI Dungeon is the original AI-powered text adventure platform where you create and explore stories across any genre. The r/AIDungeon community of 53,000 uses it primarily for fantasy RPG, sci-fi, horror, and collaborative worldbuilding with unlimited story branches.
Key Features:
- ✓Unlimited story genres including fantasy, sci-fi, horror, mystery
- ✓11 AI models with 2k to 32k token context windows
- ✓Memory bank and auto-summarization for story continuity
- ✓World info and lore editor for custom story settings
- ✓Community scenario library with thousands of shared player creations
Pricing:
Free + Adventurer $9.99/mo
Pros:
- + Genuinely open-ended creativity with no predefined story structure
- + Retry and undo tools let you refine any AI response directly
- + Community scenarios give a ready-made starting point for any genre
- + Free tier allows unlimited basic story play
Cons:
- - Story coherence drops in longer narratives without the memory bank enabled
- - Repetitive outputs appear frequently in complex multi-session story arcs
- - Content filtering restricts certain creative fiction directions
Best For:
Writers and RPG players who want a flexible text adventure sandbox without a fixed story structure and do not mind iterating on AI outputs.

