Extypis or Sudowrite: Which AI Writing App to Choose in 2026?

If you're writing a novel and reading blogs about writing with AI, you'll inevitably come across Sudowrite, the tool most often mentioned when people talk about AI for novelists. It's well designed, because its team understood that a novel has a structure, characters, a tone and a logic of its own, and that a useful AI needs to know them.

Extypis starts from the same idea, since its AI also sees the whole project, but it gives the machine a different role. Sudowrite puts text generation front and center, up to entire chapters, while Extypis was designed first as a writing studio where the AI stays discreet, can be switched off in one click, and offers suggestions without writing the book for you.

This comparison is based on both tools' websites, consulted on 27 September 2026. Prices and plans change often, so check each company's page before you decide.

Sudowrite

Sudowrite was founded by two writers, Amit Gupta and James Yu, and is aimed first at English-language novelists.

What it offers, according to its website:

• Story Bible, which takes the writer from idea to outline, from outline to chapters, then "to 1,000s of words, in your style";
• Write, Rewrite, Describe and Expand, to continue a passage, rephrase it, add sensory detail or lengthen it;
• Canvas, a space for exploring plot twists, character arcs and themes with the AI;
• Visualize, which generates images from your character sheets and worldbuilding documents;
• Plugins, some of which turn a novel into a screenplay;
• its own fiction models, Muse and Ballad, plus more than thirty other models, including those from Anthropic and OpenAI;
• from the Professional plan up, developmental edits, line edits and beta reads.

Its pricing: Hobby & Student at $19 a month, Professional at $29 and Max at $59, reduced to $10, $22 and $44 a month when paid annually. The plans differ mainly in the number of AI credits, and the free trial requires no credit card.

Its languages: its FAQ explains that the AI follows the language you're writing in when you ask it to continue, but that other features may fall back on English when they aren't sure.

Extypis

Extypis is an independent French writing app, funded by its founder, with an interface in English, French, Spanish, German and Chinese. It focuses first on building the book, and the AI comes on top to help the writer who asks for it.

What it offers, according to its pricing page:

• story element sheets (characters, places, objects, events, themes and your own categories), linked to each other on a relationship map and shareable across the volumes of a series;
• detection of characters and places throughout the manuscript, even under a nickname, with their presence chapter by chapter;
• a story plan (three-act structure, Save the Cat or the hero's circle), the Snowflake Method, a scene board and a mind map;
• writing modes for screenplays (with FDX and Fountain exchange) and for poetry (syllables, meter and rhyme in French);
• an AI that sees the whole project, which you ask for a rephrasing, the continuation of a passage or the end of a sentence, along with generated sheets, front and back matter, and images;
• an AI-free mode, which removes every AI tool from the interface, and a "human origin" certificate, which shows how the text was written;
• exports to LaTeX-typeset PDF, DOCX, EPUB, HTML and Markdown, and publishing to WordPress.

Its pricing: a free account with no time limit and no credit card (one project of 10 sheets, 5 exports a month, 2 save points and 300 AI credits once), the Extypis plan at €9 a month, without AI and with no limit on projects or sheets, and Extypis AI at €13 a month, with 3,000 AI credits every month. Paying annually saves 17%.

The two tools side by side

	Sudowrite	Extypis
Free option	Free trial	Free account with no time limit (1 project, 10 sheets)
Plan without AI	None	€9 a month
Cheapest plan with AI	$19 a month, $10 annually	€13 a month
Generating whole chapters	Yes, with Story Bible	No, the AI continues a passage on request
Switching off all AI	Not mentioned	Yes, in one click
Image generation	Yes (Visualize)	Yes (cover, characters, places)
Sheets, plan and structure	Story Bible, Canvas	Linked sheets, series, story plan, scene board
Screenplay and poetry	Novel-to-screenplay conversion via a plugin	Screenplay and poetry modes in the editor
Language	Writing in almost any language, possible fallback to English	Interface in five languages, analysis tools for French verse
Training on your texts	No, according to its FAQ	No

The role given to the AI

This is the real difference between the two tools, since they partly use the same models.

Sudowrite embraces an active role for the AI. Its home page promises to help you write a novel "from start to finish. FAST.", and Story Bible can produce whole chapters from your outline, which you then reread and edit. Its FAQ still says the tool is not intended to write for you, and many writers only use it to unstick a sentence or find a word.

Extypis makes the opposite choice by offering no generation of chapters or whole books. The AI proposes a rephrasing, a few sentences of continuation in the direction you choose or the end of a sentence, and it never kicks in while you're typing. The writer approves every word, and a writer who wants no AI at all can make it disappear from the screen.

The right choice therefore depends on what you expect from the machine. If you want to produce fast with an AI that takes a large share of the text, Sudowrite is built for that. If you want to write yourself, with occasional help that stays within the frame you set, Extypis will suit you better.

Writing in languages other than English

Sudowrite itself acknowledges that some of its features may fall back on English when they're unsure, which matters if you write in another language. Its interface and documentation are in English.

Extypis was designed in French, with analysis tools built for that language, such as the syllable count, meter and rhymes of its poetry mode, and an interface also available in English, Spanish, German and Chinese.

Data

Both tools state that they don't use your texts to train models, so this criterion doesn't separate them. Sudowrite is an American company, while Extypis's database is hosted in Europe, in Frankfurt, and falls under the GDPR. If you write about sensitive subjects, such as memoir or autofiction, read each tool's privacy policy before you decide anyway.

Price

For regular use with AI, Sudowrite Professional costs $29 a month, or $22 a month paid annually, which comes to $264 a year. Extypis AI costs €13 a month, and about 17% less paid annually. The number of included credits can't be compared directly, because each tool counts its credits in its own way.

Extypis also offers two options Sudowrite doesn't: a permanent free account, enough to write a short story or a short novel, and a €9-a-month plan for writers who want no AI at all.

Which one to choose

Sudowrite will suit you if:

• you write in English and target the English-language market;
• you want the AI to produce a large share of the text, up to entire chapters;
• you're counting on a large community of English-speaking users.

Extypis will suit you if:

• you write in French, or in several languages;
• you want to write yourself, with an AI that only offers suggestions when you call on it, or with no AI at all;
• you need linked sheets, multi-volume series, a screenplay mode or a poetry mode;
• you want polished exports, a LaTeX-typeset PDF, an EPUB or publishing to WordPress;
• you'd rather start for free and pay only for what you use.

You can try Extypis for free, with no credit card, with 300 AI credits to test the assistant. If the tool doesn't suit you, you'll have spent nothing and you'll know better what you expect from a writing app.

To go further, the writing software page details Extypis's features, and the fiction page shows how the tool adapts to novelists.