TL;DR: Sudowrite is a guided novel-writing assistant — its fiction-trained Muse model reads your Story Bible on every generation, and it adds outlining, drafting and revision tools on top. NovelAI is an unlimited text sandbox — flat pricing, no credit meter on words, a keyword-triggered Lorebook, and anime image generation in the same subscription. Pick Sudowrite to finish a structured novel with help at every step; pick NovelAI if you want unlimited generation, maximum control, and no structure imposed on you.
Sudowrite vs NovelAI at a glance
| Feature | Sudowrite | NovelAI | Edge |
|---|---|---|---|
| Starting price | $10/mo billed annually ($19 monthly) | $10/mo, monthly billing only | Tie |
| Top plan | Max $44/mo billed annually ($59 monthly) | Opus $25/mo | NovelAI |
| How words are billed | Monthly credits: 225,000 / 450,000* / 2,000,000 | Unlimited text on every paid tier | NovelAI |
| Credit rollover | Only on Max, for 12 months | No word credits to roll over | NovelAI |
| Story memory | Story Bible, read on every generation; Series Folder across books | Lorebook, keyword-triggered entries; memory grows by tier | Sudowrite for ease, NovelAI for control |
| Outlining and plotting | Canvas, Outline, Scenes and Draft tools built in | None | Sudowrite |
| Revision tools | Rewrite presets, Describe, Expand, Feedback | Manual bracket instructions to the model | Sudowrite |
| Image generation | No | Yes — anime-focused, paid for with Anlas credits | NovelAI |
| Free trial | Yes, no credit card required | Paper trial: 50 text, 30 image and 100 text-to-speech generations, one time | Sudowrite |
*See the pricing note below — Sudowrite’s own pages disagree on the Professional plan’s credit allowance.
What is the core difference between Sudowrite and NovelAI?
Sudowrite is organised around the jobs of writing a novel. You brainstorm, build a Story Bible of characters and worldbuilding, outline on a Canvas, draft scene by scene, then revise with dedicated tools. Its Muse model is trained for fiction, and the Story Bible is fed to the model every time it writes, so chapter nine knows what happened in chapter two. If that workflow sounds appealing, our Sudowrite review walks through the tool in more depth.
NovelAI is a text box and an engine. There are no plotting buttons and no revision presets. You type, it continues, and a dense settings panel lets you tune randomness, repetition and style modules. Continuity comes from the Lorebook: entries for a character, place or object are injected into context when their keyword appears in your recent text. Writers who find structure suffocating love this freedom; writers who want help finishing a book often stall in it.
Story Bible vs Lorebook: which remembers your book better?
Sudowrite’s Story Bible holds genre, style, synopsis, characters and worldbuilding, and it is read automatically on every generation — including a Series Folder that carries the same bible across books in a series. You fill in cards; the AI does the remembering. NovelAI’s Lorebook gives you finer control — activation keys, ordering and cascading entries — and rewards writers who enjoy configuring systems, but the amount it can hold in context at once depends on your tier: Opus remembers up to 28,672 tokens, while the cheaper tiers remember less. For a sprawling fantasy world you are happy to maintain by hand, the Lorebook is powerful. For most novelists, the Story Bible is the lower-effort win.
How do the prices actually compare?
Both start at $10 a month, but they meter completely differently. NovelAI charges Tablet $10, Scroll $15 and Opus $25 a month, billed monthly with no annual discount, and text generation is unlimited on all three — the extra money buys a bigger story memory and more Anlas, the credits spent on image generation (1,000 a month on Tablet and Scroll, 10,000 on Opus). Sudowrite charges $10, $22 or $44 a month billed annually ($19, $29 or $59 if you pay monthly), every plan unlocks every feature, and the tiers differ only in monthly credits. Heavy drafters who generate enormous volumes will find NovelAI cheaper; writers who also want planning and revision in the same tool get more jobs done per dollar in Sudowrite.
What the pricing page doesn’t make obvious: Sudowrite’s own pages currently disagree about the Professional plan. Its comparison page lists Professional at 450,000 credits a month, while its help documentation lists 1,000,000 credits for the same plan. Check the allowance shown at checkout before you rely on either number. Two smaller gotchas worth knowing: on Sudowrite’s Hobby and Professional plans, unused credits expire at the monthly refresh — only Max rolls credits over, for 12 months. And NovelAI subscriptions renew exactly 30 days after payment rather than on a calendar date, so your billing day drifts over time.
Which should you pick?
Pick Sudowrite if you think in plot and structure, you want the AI to remember your characters without configuring anything, you revise as much as you draft, or you would rather press a button than write a prompt. It is the stronger pick for a first novel and for series writers who want continuity handled for them.
Pick NovelAI if you are a worldbuilder first, you want unlimited generation for a flat fee, you enjoy tuning settings and style modules, or you also want anime-style image generation bundled into the same subscription.
Still browsing the category? Our roundup of the best AI tools for authors covers more options, and writers who want a hand-maintained story bible with their own choice of AI model should also look at our Novelcrafter review.
Bottom line: Sudowrite is the better novel-writing assistant; NovelAI is the better unlimited sandbox. The $10 starting prices match — what differs is whether you are paying for guidance or for freedom.
Frequently asked questions
Is NovelAI or Sudowrite cheaper?
Both start at $10 a month. NovelAI’s top tier is $25 with unlimited text, while Sudowrite’s top tier is $44 billed annually with 2,000,000 credits and 12-month rollover. For very heavy generation, NovelAI costs less; for drafting, planning and revising in one tool, Sudowrite replaces several separate purchases.
Does NovelAI have a Story Bible?
No. Its equivalent is the Lorebook, a keyword-triggered knowledge base that stores lore well but plans nothing. Sudowrite’s Story Bible also holds your outline and is read by the model on every generation.
Can I try both for free?
Yes. Sudowrite offers a free trial with no credit card required. NovelAI’s Paper trial is a one-time allowance — 50 text generations, 30 image generations and 100 text-to-speech generations on an email-verified account — rather than an ongoing free plan.
Which is better for long series?
Sudowrite, for most writers: its Series Folder shares one Story Bible across every book in the series automatically. NovelAI’s Lorebook can handle huge worlds too, but you maintain and trigger the entries yourself.