NovelAI vs AI Dungeon: A Writing Suite or a Playable Adventure?

Most NovelAI vs AI Dungeon comparisons read like the writer has a horse in the race. A lot of them sit on sites selling a competing tool, which is worth knowing before you take a verdict at face value. So here is the plainer version, based on published pricing pages, help documentation and user reports as of October 2026: these two products are not really rivals. They overlap in the middle and diverge hard at the edges.

Short version: –-style polish for prose, memory tools and anime images sit with NovelAI. Free access, public adventures and actual co-op play sit with AI Dungeon. The rest is detail, and some of that detail is a genuine mess.

The verdict, category by category

No single winner. Read across the row that matches what you want to do.

Category	NovelAI	AI Dungeon	Edge
What it is	Premium writing suite	Text adventure engine	Depends on goal
Writing style	Polished, atmospheric	Lively but erratic	NovelAI
Memory	Memory box, Lorebook	Plot Essentials, Story Cards	NovelAI
Multiplayer	Not offered	Yes, co-op	AI Dungeon
Image generation	Anime art	Scene pictures	NovelAI
Adult content	Minimal filters	Settings within rules	NovelAI
Free access	Trial only	Free tier, basic models	AI Dungeon
Price	From $10/month	Sources conflict	NovelAI for clarity
Learning curve	Steeper	Easy to start	AI Dungeon

What each one actually is

NovelAI is a creative writing suite. It generates prose, and it generates it well enough that people use it to draft fiction rather than to play. It has no chat persona, no companion to talk to, no avatar waiting for you. Reviewers note it does include a text adventure mode, so the line is blurred, but the centre of gravity is the page.

AI Dungeon, run by Latitude, is an interactive text adventure. It went public as AI Dungeon Classic in May 2019, per Wikipedia, and it has spent the years since being a thing you play rather than a thing you write into. Its four modes are Do, Say, Story and See. There is no built-in dice roller and no stat sheet. The game master decides outcomes by feel, which is either liberating or maddening depending on how much you like rules.

One runs on models NovelAI describes as in-house and fine-tuned on literature. Whether that training data is what the marketing implies is unverifiable from outside. There is also an unconfirmed claim floating around that the newest NovelAI model carries 355 billion parameters. Treat that as a number someone typed, not a specification.

Writing quality and voice

This is NovelAI's home turf and it is not especially close. The prose comes out atmospheric and controlled. It holds a tone across paragraphs, which matters if you are drafting a scene rather than nudging a story forward one command at a time.

AI Dungeon writes with energy and very little discipline. Ask it for a tense standoff and you may get one, followed two paragraphs later by a talking badger and a sudden change of genre. That is part of the charm when you are playing. It is a problem when you are trying to finish a chapter.

A practical note: AI Dungeon's output improves noticeably when you use Story mode rather than leaning on Do. It gives the model a paragraph to build on instead of a single action. Cheap trick, real difference.

Playing versus writing

AI Dungeon is a game. It supports real-time multiplayer co-op and a public library of community scenarios, so you can drop into someone else's world with a friend and start moving. For a text-based product, that is a genuinely unusual feature and it is the single strongest reason to pick it.

NovelAI does not offer multiplayer. Comparison guides say so, and nothing in its own material suggests otherwise. If you want to write alongside another person, you are doing it by screen-sharing or copy-pasting.

Where AI Dungeon falls down is mechanical depth. No dice, no stats, no rules engine. The game master improvises. Some players love that; others find that a campaign loses stakes when nothing is quantified.

Memory and context

Both platforms have a memory system. Both systems reduce contradictions. Neither eliminates them, and long sessions on either tool will eventually produce a character who has forgotten their own name.

NovelAI uses a Memory box for persistent facts plus a Lorebook that fires entries when trigger keywords appear. Set it up properly and your world stays consistent for a long time. Skip it and the model drifts. The Lorebook is the better of the two implementations, which is why the memory row goes to NovelAI.

AI Dungeon uses Plot Essentials and Story Cards, per its help pages. There are reported, unverified figures that memory caps at 2,000 tokens on free and 32,000 on the Mythic tier. We have not confirmed those numbers and would not build a subscription around them until the official pages say so.

Filters and adult content

NovelAI runs minimal content filters, according to Laterpress and earlier research. Comparison guides describe it as allowing NSFW without ID verification and without the moralising interruptions that plague some rivals. If you write adult fiction, that matters more than any benchmark.

AI Dungeon added content moderation in April 2021, targeting sexual content involving minors, per Wikipedia. The intent is unarguable. The execution caught a large number of false positives, and the filter can still misfire on perfectly ordinary scenes. Adult settings exist within the rules, but you will hit the occasional wall for no obvious reason.

Both platforms ban sexual content involving minors. That is not a grey area on either side, and it should not be treated as one. Keep every character an adult, and expect rules to change as platforms update their policies.

Image generation

NovelAI's image tools are optimised for anime. Guides point to NAI Diffusion V4.5, and describe support for multiple characters in a single image plus inpainting. Reviewers talk about Focused Inpainting specifically. A background removal tool has been mentioned but remains unconfirmed, so do not count on it.

AI Dungeon's See mode draws pictures of the current scene. It is a nice touch mid-adventure and it is not trying to be a polished art generator. If you want a usable illustration, NovelAI wins without much of a fight. If you want a rough sketch of where your character is standing, See does the job.

Worth remembering: on NovelAI, text is unlimited on paid plans and credits are spent only on images. That split keeps the bill predictable in a way that many companion apps do not. If token economics are what worry you, our breakdown of what these apps actually cost is a useful contrast.

Pricing, and the AI Dungeon problem

NovelAI's pricing is clear. Per pricing guides and its own homepage, plans start from $10/month, with a trial but no free tier.

Plan	Price per guides	Notes
Tablet	$10/month	Matches the homepage from price
Scroll	$15/month	Middle tier
Opus	$25/month	Most image credits

AI Dungeon is where things get silly. Published figures do not agree with each other.

Claim	Source
Mythic nearly $50/month	ai-girlfriend-review.com, Loreon
Paid plans $14.99 to $99.99/month	Loreon, DungeonsDeep (a competitor)

Neither claim is verified. Some of those sources sell competing tools. Check the official membership page before you enter card details, and do not trust a comparison table that will not show its working.

The free tier is real, though. Guides describe a Wanderer tier running basic models with strict limits. It is enough to find out whether you like the format. Cheaper to try than NovelAI, no question. Whether it is cheaper to keep depends on which of those conflicting numbers turns out to be accurate.

Privacy and safety

NovelAI says prompts are encrypted, and comparisons describe client-side encryption and a commitment not to train on user content. Those are company claims. The server still reads your prompts to generate a response, so encryption here means protection in transit and at rest, not secrecy from the operator.

AI Dungeon stores stories on its own servers. We found no clear public statement on whether user stories are used for training, and comparisons note the absence of end-to-end encryption. The history matters too: in 2021, human moderators reviewed private stories. Whatever the reasoning at the time, that is the fact people remember when they decide what to type into the box.

If privacy is the deciding factor for you, the honest answer is that neither cloud service is the right tool. Local options such as KoboldAI and SillyTavern keep stories on your own machine. Less convenient, no subscription, nothing leaving the house.

Ease of use and community

AI Dungeon is in a browser and on phones, and you can be inside a story within a minute of signing up. The public scenario library means you never have to start from nothing. That is a real advantage for anyone who freezes at a blank prompt.

NovelAI has a steeper learning curve. To get the output the marketing shows you, you need to think about context, memory and Lorebook entries. Newcomers who skip that step conclude the model is worse than it is. It is not; it is under-briefed.

The community split follows the same line. AI Dungeon has a visible public library and shared adventures. NovelAI's users congregate around guides and prompt craft rather than shared worlds, because there are no shared worlds to speak of.

What to watch out for

• NovelAI: no free tier after the trial, a steep learning curve, drift in long sessions, no multiplayer, and images that are mostly anime.
• AI Dungeon: conflicting published prices, drift and contradictions in long campaigns, a moderation history that included reading private stories, and filters that can misfire.
• Unverified numbers: the 355B parameter claim for NovelAI, the 2,000 and 32,000 token memory figures for AI Dungeon, and every AI Dungeon paid tier price we found.
• Unconfirmed features: NovelAI background removal.
• Privacy caveats: NovelAI's protections are largely company claims, and its servers still read prompts. AI Dungeon's training use is unclear and there is no end-to-end encryption.
• Rival comparison sites: many sell competing tools. Treat confident verdicts with care.

Who should pick which

Pick NovelAI if you are writing fiction and want the words to sound like something. You want a Lorebook that keeps your cast consistent, you write adult material and do not want to argue with a filter, and you want anime illustrations without a separate subscription. You are willing to spend an evening learning the memory tools. Budget from $10/month and accept there is no free tier after the trial.

Pick AI Dungeon if you want to play. You want to start free, you want to pull a friend into a co-op campaign, and you like browsing public scenarios for ideas. You do not mind that the plot will occasionally go sideways, and you are prepared to check the official membership page because nobody's published prices agree.

If you want a companion rather than a co-writer, neither is the right shape. NovelAI has no chat persona and AI Dungeon is a game engine. For that job, look at a dedicated app: our full list of scored apps is the place to start, and for a sense of how memory and billing behave in that category, the Secrets AI vs Candy AI comparison covers both well. Note the usual trap there: images and voice often cost tokens, so a bill can climb past the listed plan.

Bottom line

Once the goal is clear, this stops being close. NovelAI is the better writing tool: cleaner prose, a stronger memory system in the Lorebook, anime images, lighter filters and clearer pricing from $10/month. AI Dungeon is the better game: free to start, easy to grasp, a public library and actual multiplayer.

If you write, spend the NovelAI trial on a scene you genuinely care about, not a throwaway test. If you play, open a public AI Dungeon adventure and give it ten minutes. Both experiments cost you nothing but time, and either one will tell you more than another comparison table will.