ProselonAll comparisonsLast reviewed September 17, 2026
Sudowrite vs Proselon
Both put a serious AI to work on your novel. Proselon is $6 a month, flat — the co-writer runs on the Claude, ChatGPT, Grok or Gemini subscription you already pay for, nothing is metered, and your book stays as plain files on your own computer.
Proselon and Sudowrite: pricing, AI, and ownership
The difference is the bill and where your book is stored. Sudowrite charges $19 to $59 a month and meters every generation as credits, with your manuscript on its servers.
Proselon gives you agentic co-writing with your whole book in reach for a fraction of the monthly cost. It is free for 30 days, unlimited, with no credits to count.
| Where they differ | Proselon | Sudowrite |
|---|---|---|
| Price | $6/mo, or $50/yr | Hobby & Student $19/mo ($10/mo billed annually) · Professional $29/mo ($22/mo annually) · Max $59/mo ($44/mo annually) |
| AI | Included — the co-writer runs on the AI subscription you already pay for | Included, metered as credits: 225,000 / 1,000,000 / 2,000,000 per month by tier (the pricing page shows Professional's million as a doubling of 450,000) |
| Your manuscript is stored | Plain files in your own Documents folder | On Sudowrite's servers |
| Runs on | macOS (Apple Silicon and Intel), Windows 10/11 | Web browser, plus companion apps for iOS and Android |
| Works offline | Yes — the app and your files are local. A local model keeps the AI offline too | No — it is a web app |
| Free trial | 30 days, the whole app, unlimited co-writing, and no card required | A 14-day free trial, no card required — there is no ongoing free tier. A 7-day money-back guarantee sits behind it |
| Version history and backups | Every save kept automatically, as a git backup you can take anywhere | Version history inside the app. Backup is a manual export (.zip or .docx), which leaves out the Story Bible |
| Exports | Word, EPUB, HTML, plain text, all packaged right in | Word (.docx), project .zip, and .csv for Story Bible sections |
Last reviewed September 17, 2026.
Flat pricing no matter how many tokens you use
With Proselon, working harder costs nothing extra.
The $6 is the whole bill from us, because the AI is the subscription you already pay for — Claude, ChatGPT, Grok or Gemini, signed in the way you always sign in, no API keys. Rewrite the scene thirty times. Have the co-writer reread your whole manuscript. The price on a heavy month and a light month is the same number, and a free local model through Ollama or LM Studio has no meter at all.
Sudowrite sells you the AI as credits, at its own price. With Proselon you pay the AI provider directly, at their rates. We neither resell that access nor mark it up, and there is no meter from us: no middleman stands between you and the AI you chose.
With Sudowrite, working harder costs more. Apart from Quick Edit and Chat, which are free in their default mode, every generation spends credits, so a scene you rewrite eight times costs roughly eight times what accepting the first draft would have. Sudowrite names the result in its own writing, “credit anxiety,” and admits it can make you hesitant to experiment. Its documentation states that there is “no way to predict” how many credits features will use, and puts a million credits at anywhere from 50,000 to 500,000 words a month. As pricing, that reads less like a rate card than like a weather forecast.
Sudowrite’s price does include its AI, and Proselon’s assumes you have one. If you pay for no AI at all and won’t run a local model, put a $20 Claude or ChatGPT plan on our side of the ledger. Even then, $26 all-in sits under Sudowrite’s Professional plan at its monthly price, and it never runs out mid-scene.
A co-writer with your whole book on its desk
Proselon’s co-writer sits over the manuscript itself.
It opens any chapter on demand and reads what the page says, so continuity holds across a long book, a series, or a serial you post as you go. Book four gets checked against what book one promised, and nobody’s eyes have changed color by chapter forty. And because it drafts against a style guide and a voice reference built from your writing, then rewrites anything that drifts, what comes back sounds like you on a good day rather than like a chatbot.
Sudowrite’s writing tools read a bounded slice of the book. Its documentation puts Write at up to 20,000 words before the cursor, with up to 20,000 more from as many as 25 chapters you link by hand, and lists what is dropped first when that overflows. Its Chat can read and edit your documents when you allow it, inside Sudowrite and on Sudowrite’s credits.
Your manuscript: your disk, or their servers
A novel is years of work, and where it is stored matters more than any feature.
Proselon writes your book as plain text files in your own Documents folder from the first minute. Back it up however you back things up. Open it in any editor on earth. If Proselon vanished tomorrow, nothing about your manuscript would change.
Every version is kept as well. Autosaves preserve your work, and any save can be read or brought back, one page or all of them. Backups are managed using git, a backup system used by developers, which means you can take your backups with you anywhere.
Sudowrite keeps your book on its servers, where your access to it is your subscription and leaving means exporting to Word and rebuilding elsewhere.
Questions people ask
Is Proselon cheaper than Sudowrite?
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Yes, at $6 a month against $19 to $59, and the gap widens with use. Sudowrite's price buys a monthly allowance of credits that heavy writing burns through, while Proselon's co-writer runs on the Claude, ChatGPT, Grok or Gemini subscription you already pay for, so a heavy month costs the same $6 as a light one. The caveat is that Sudowrite's price includes its AI and Proselon's assumes you have one. If you don't pay for any AI and won't run a free local model, we recommend you budget $20 a month for an AI subscription.
Can I use my existing ChatGPT or Claude subscription with Sudowrite?
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No. Sudowrite runs the AI itself and sells it to you as credits, and it offers no way to connect the plan you already pay for. Proselon is built the other way around. You sign in to your own Claude, ChatGPT, Grok or Gemini account inside the app, and that subscription does the writing at no extra charge.
Where is my manuscript stored in each one?
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Sudowrite stores your book on its servers, where you reach it through a browser and can export Word, a project zip, or csv. Proselon keeps your book as plain text files in your own Documents folder from the first minute. Stop paying Sudowrite and you have an export; stop paying Proselon and your book is still there, on your disk, readable in anything.
Does either one work offline?
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Proselon does. The app and your files are local, and with a free local model through Ollama or LM Studio the co-writer needs no internet at all. Sudowrite runs in a browser and in its mobile apps, and needs a connection for everything.
Thirty days, the whole app, no meter
Download Proselon, sign in to the AI you already pay for, and put your whole book on the co-writer’s desk — free for a month and $6 after, with never a credit to count.
Other comparisons
Last reviewed September 17, 2026.
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The other products named on this page are trademarks of their respective owners. Proselon is not affiliated with, endorsed by, or sponsored by any of them, and the comparison rests on their publicly available materials as of the date above.