AI Dungeon vs Janitor AI (2026): A Game Engine Against a Cast
AI Dungeon and Janitor AI are not competing for the same evening, and the seven axes say so clearly: each one wins the things the other is weakest at.
AI Dungeon is a game. It has a world, a turn structure, a documented context system and a set of tools for telling it what to remember. What it does not reliably produce is a character you care about.
Janitor AI is a cast. It has the strongest NPCs we have scored on any platform and an enormous library of them, attached to no game whatsoever — no state, no mechanics, no consequence that survives the conversation.
That is the whole comparison in two sentences, and almost every practical question resolves from it.
The Short Version
| AI Dungeon | Janitor AI | |
|---|---|---|
| Overall | 2.6 | 3.0 |
| Memory & Continuity | 3 | 2 |
| Player Agency | 4 | 3 |
| NPCs | 3 | 5 |
| Rules Depth | 2 | 2 |
| Fairness | 2 | 3 |
| Longevity | 2 | 3 |
| Signature Design | 2 | 3 |
Janitor AI takes the higher composite, but the composite is the least interesting number on this page. The two axes AI Dungeon wins — Memory & Continuity — 3 and Player Agency — 4 — are the two that decide whether something feels like a game you are playing. The four Janitor wins are about the quality of who you are playing with and whether you come back.
Read the table as a question about your evening rather than a ranking. Full scoring for each sits in the AI Dungeon review and the Janitor AI review.
Player Agency: The Widest Game-Side Gap
Player Agency — 4 is AI Dungeon’s best score and the single highest number either platform holds outside Janitor’s NPCs.
The reason is structural. AI Dungeon accepts an action and resolves it against a world. You can do something the scenario did not anticipate and the game will make something of it, which is the thing the platform has been known for since it started the genre. It has scenario tooling, scripting, and a turn loop that behaves like a turn loop.
Janitor scores Player Agency — 3, and the ceiling is the format. A Janitor chat is a conversation. You can attempt anything you like, and what you get back is a character responding to it — not a world resolving it. Nothing arbitrates. If you say you pick the lock, the lock opens if the character feels agreeable, because there is no lock and no difficulty and no roll. That is fine for a scene and thin for a game.
This is also why building an RPG on Janitor means building the arbitration yourself, usually as a status block the model reprints each turn. It works, and we cover the method in how to run a real RPG on Janitor AI, but it is construction work that AI Dungeon does not ask of you.
NPCs: The Widest Gap On The Page
NPCs — 5 for Janitor against NPCs — 3 for AI Dungeon is a two-point spread, the largest between them on any axis, and Janitor’s score sits at the top of the scale.
Two things produce it. The first is the library: Janitor’s catalogue of community-written characters is enormous, and a character that thousands of people have played is a character whose card has been iterated on. The second is model choice. Janitor counts four fields into every prompt — personality, scenario, example dialogue and first message — and connecting a strong model to a well-written set of those four produces someone who holds a voice across a long conversation.
AI Dungeon generates its characters as part of a world. That serves the story, and it rarely produces a person you remember. Characters appear because the narrative needs someone there, and they are consistent for as long as they remain in context.
If the thing you want from an evening is a character, this row is the whole decision.
Memory: AI Dungeon, and It Publishes Its Arithmetic
Memory & Continuity — 3 against Memory & Continuity — 2 understates the practical difference, because the axis measures outcomes and the real gap is in the tooling and the documentation.
AI Dungeon gives you four distinct instruments — Story Cards, the Memory Bank, Plot Essentials and the Author’s Note — and, unusually for this field, it publishes how its context is allocated: required elements are capped at 70% of the window, and what remains is split between history, the Memory Bank and Story Cards. Knowing those proportions lets you do arithmetic about what will survive, which is the subject of our Story Cards guide.
Janitor keeps world information in lorebooks, which are not part of the character at all but a separate object built under your profile as a script. They work on keyword triggers, and they are genuinely capable, but the platform has said openly that it has not documented the system properly. There is also a quieter problem: a character’s token counter breaks its total into those same four fields and has no line for lorebook text, so lore is in the prompt and invisible in the count. We cover the mechanics in Janitor AI lorebooks.
Both forget. AI Dungeon tells you the shape of the budget you are working against; Janitor asks you to infer it.
Rules Depth: A Tie at the Bottom
Both score Rules Depth — 2, and this is the row people are most often surprised by, because AI Dungeon feels like it has more game in it.
It does — but feel is not mechanics. Neither platform has dice you can rely on, a character sheet it maintains, or numbers it will not quietly rewrite. AI Dungeon can be scripted into something closer to a system, and Janitor can be prompted into reprinting a status block, and in both cases the rules exist because you built them and persist because the model is being reminded of them.
If a rules engine is what you are looking for, this tie is your answer: neither of these is it, and no amount of choosing between them changes that.
Fairness, Longevity and Signature Design
Janitor takes all three, each by a single point.
Fairness — 3 against 2. AI Dungeon’s weakness here is a long-standing one: outcomes that bend toward whatever the narrative finds interesting rather than what the situation warranted. Janitor is not arbitrating outcomes at all, which turns out to be more predictable than arbitrating them inconsistently.
Longevity — 3 against 2, and this one needs care, because it measures reasons to return rather than how well one story holds. Janitor’s longevity is the library — there is always another character. AI Dungeon’s problem is that scenarios tend to exhaust themselves and the next one starts from nothing. For one continuous campaign across many sessions, AI Dungeon’s memory tooling gives you more to work with even though it scores lower here, which is exactly the kind of thing a composite hides.
Signature Design — 3 against 2. Janitor’s signature is the bring-your-own-model library: a genuine idea about what the platform is for. AI Dungeon’s signature was once the whole genre, and the thing it pioneered is now everywhere, which leaves it without much that is distinctly its own.
Price and Setup
Both are freemium with a real free tier, and the shape of the spending differs enough to matter.
AI Dungeon runs its own models. You never supply an API key, and paying moves you to better models and a larger context window. Money buys a better game, directly, and the ceiling is whatever the top tier offers.
Janitor AI offers a free hosted model that is usable, and the upgrade path most people take is not a Janitor subscription but connecting their own model through an API, paid by usage. That is where most of Janitor’s writing quality comes from, and it is the reason the NPC score is what it is.
The practical consequence: Janitor is cheaper to try and can be more expensive to run heavily, and a serious Janitor setup involves an API key while a serious AI Dungeon setup does not. If an API key is a wall for you, that fact matters more than any axis on this page. Our Janitor API key guide covers that route.
Which Should You Choose?
Choose AI Dungeon if you want to play rather than talk — a world that takes an action and does something with it, a turn structure, scenario and scripting tools, and a documented context system you can plan around. It is the better choice for solo adventuring and for anyone who wants the game to hold some of the structure so they do not have to.
Choose Janitor AI if you want a character. The library is the reason to be there, the NPC ceiling is genuinely high, and bringing your own model raises the writing further than anything available on the other side. It is the better choice for scene-driven play, for character-first roleplay, and for anyone who would rather pick someone interesting than build something structured.
Choose neither if you want a world that tracks state, enforces consequences and remembers across sessions without you maintaining it by hand. Both score 2 on Rules Depth and neither exceeds 3 on Memory; that combination is a fair description of what they cannot do. Which AI RPGs actually remember ranks the platforms built for it, and the memory ranking and the longevity ranking turn out to be different lists.
The Option Neither One Offers
If what attracts you to Janitor is the character library but what frustrates you is the lack of control, the usual destination is SillyTavern — a front-end you run yourself, with your own model, four separate memory systems and full control over the prompt. Janitor lorebooks even import into it, and vice versa.
It is a much larger setup job, and it is not a game either; it is a cockpit. If that sounds right, start with the SillyTavern guide and then what it actually remembers, which is the part most people get wrong.
Checklist
- AI Dungeon 2.6, Janitor AI 3.0 — but the composites hide the shape.
- AI Dungeon wins the game-side axes: Player Agency and Memory & Continuity.
- Janitor wins NPCs by two full points, the widest gap on the page, plus Fairness, Longevity and Signature Design.
- Both score 2 on Rules Depth. Neither is a rules engine.
- AI Dungeon publishes its context allocation; Janitor does not document its lorebooks.
- Janitor’s quality upgrade is your own API key, not a subscription.
- Want a world that responds — AI Dungeon. Want someone worth talking to — Janitor.
Frequently Asked Questions
Is AI Dungeon or Janitor AI better? They win on different things, which is why the choice is usually easy once you know what you want from the evening. On our seven-axis methodology AI Dungeon scores 2.6 and Janitor AI scores 3.0, but the composites hide the real answer. AI Dungeon is ahead on Player Agency and Memory, which are the axes that make something feel like a game you are playing. Janitor AI is ahead on NPCs, Fairness, Longevity and Signature Design, and its NPC score is near the top of the scale. If you want a world that responds to actions, AI Dungeon. If you want a character who feels like a person, Janitor AI.
Which has better memory, AI Dungeon or Janitor AI? AI Dungeon, and it is the clearest structural difference between them. We score AI Dungeon 3 on Memory and Janitor AI 2. AI Dungeon publishes how its context is allocated, caps required elements at 70% of the window, and gives you Story Cards, a Memory Bank, Plot Essentials and an Author’s Note as separate tools with defined roles. Janitor AI counts four fields into every prompt and keeps world information in lorebooks that live outside the character as scripts. Both eventually forget, because both are language models with a finite window, but AI Dungeon gives you more levers and tells you what they do.
Which has better characters, AI Dungeon or Janitor AI? Janitor AI, decisively. We score it 5 on NPCs against AI Dungeon’s 3, and that is the widest gap between the two on any axis. The reason is the library and the model choice together: Janitor has an enormous catalogue of community-written characters and lets you connect your own model, so a well-written card driven by a strong model produces a character who holds a voice. AI Dungeon generates characters as part of a world rather than presenting them as authored individuals, which serves the story and rarely produces someone memorable.
Is Janitor AI free compared to AI Dungeon? Both are freemium and both have a real free tier, but the shape of the cost is different. AI Dungeon’s paid tiers buy better models and a larger context window, so paying improves the quality of the game itself. Janitor AI’s free hosted model is usable, and the common upgrade path is not a subscription to Janitor but connecting your own model through an API, which you pay for by usage. That makes Janitor cheaper to try and potentially more expensive to run heavily, and it means a serious Janitor setup involves an API key while a serious AI Dungeon setup does not.
Can you play a real RPG on Janitor AI? You can, but you are building it rather than loading it. Janitor has no mechanical layer, no dice, no character sheet and no state that persists outside the conversation, so an RPG there is a character card written as a game master plus a status block the model reprints every turn. That works for exploration and consequence and badly for anything that needs numbers to be exactly right. AI Dungeon ships more of the game already assembled, which is what the Player Agency gap reflects.
Which is better for a long campaign? Janitor AI scores higher on Longevity, 3 against AI Dungeon’s 2, but read that carefully because it measures reasons to come back rather than how well a single story holds together. Janitor’s longevity comes from the library — there is always another character. AI Dungeon’s weakness there is that its scenarios tend to exhaust themselves. For one continuous story held over many sessions, AI Dungeon’s memory tooling gives you more to work with, and neither platform is strong at it compared with purpose-built alternatives.
Do I need an API key for either one? Not to start on either, and eventually for Janitor if you want the best writing out of it. AI Dungeon runs its own models and you never supply a key; paying moves you to better ones. Janitor offers a free hosted model and also supports connecting your own, which is where most of its writing quality comes from. That bring-your-own-model route is the single biggest quality upgrade available on Janitor, and it is also the point where it stops being a click-and-play platform.
What should I use if neither fits? If what you want is a world that tracks state, enforces consequences and remembers across sessions without you maintaining it by hand, both of these will disappoint you, because neither scores above 3 on Memory and both score 2 on Rules Depth. That combination is what our long-campaign ranking is for. If instead you want the deep control that Janitor’s character library hints at, with real memory tooling and your own model, SillyTavern is the usual destination and it is a much larger setup job.
Both platforms are scored on Arcanum’s seven-axis methodology; the axis values quoted here are the published scores on each platform’s entry as of 22 September 2026. AI Dungeon and Janitor AI are third-party platforms, neither holds a commercial relationship with Arcanum, and this publication is independent and unpaid; all names are used nominatively.