Best for
Best for writers and teams working in several languages who want the same checker inside their browser, office suite and mail client.
- Freelancers
- Small and mid-sized
- Enterprise
AI Writing Comparison
LanguageTool vs. Sudowrite
At a glance
At a glance
Best for
Best for novelists and narrative writers working on long-form fiction.
- Freelancers
- Small and mid-sized
Cataleo does not name a winner. Both statements come from the vendors themselves.
Full Comparison
| Criterion | LanguageTool | Sudowrite |
|---|---|---|
| Starting price | Free tier Premium is billed monthly, quarterly, annually or for two years; Teams is priced per user for 2 to 1,000 or more users. | From $19 / month Paid monthly; $10 per month paid annually. Plans are metered in credits. |
| Free trial | Free tier | 7-day refund window on any plan, no free tier |
| Commercial use | Not stated | Yes |
| Output | Spelling, grammar, punctuation and style corrections, plus AI paraphrased sentences | Long-form fiction and narrative |
| Languages | More than 30 languages and dialects, with six English varieties | Not stated |
| Hosting | Cloud (SaaS), API servers in Germany; the source code is published for self-hosting | Not stated |
| Content types | Checks and rewrites text the writer has already started rather than generating a content format; Premium raises the limit to 150,000 characters per text field, which covers blog articles, letters and long e-mails | Long-form fiction and narrative |
| Brand voice | Yes, a Style Guide of custom rules for consistent wording, and a shared Team Style Guide plus a Team Dictionary of technical terms on the Teams plan | Yes, matches your writing voice and style |
| Content scoring | No content or readability score. The editor's Statistics view tracks writing activity over time, the languages used, the errors made and the suggestions applied, which measures the writer's habits rather than rating a piece of text | No numeric score. Feedback returns five concrete areas to improve on a draft instead |
| Drafting tools | Yes, an AI paraphrasing tool that rewrites a sentence to be more formal, more fluid or shorter, uncapped on Premium | Story Bible, Write, Describe, Expand, Rewrite, Canvas, Brainstorm, Visualize and Feedback. Runs on the Muse fiction model |
| Templates | No content templates. LanguageTool corrects and rephrases text the writer brings to it; the only things reusable across documents are the personal dictionary and the Style Guide rules | No template library. A directory of over 1,000 community-built plugins adds task-specific tools such as reader simulation and character dialogue |
| Team workflows | Yes, the Teams plan adds e-mail invitations, user management, a shared style guide and a shared dictionary for 2 to 1,000 or more users | Built for a single author. Share links give beta readers view-only access with comments they cannot see from each other, and series folders share characters, worldbuilding and outline across books |
| API | Yes, the Proofreading HTTP API with JSON responses, monthly tiers from 100 to 10,000 requests, up to 60,000 characters per request, customisable rules and personal dictionary access, served from Germany without storing the submitted text | No public API. Extensions are built as plugins inside Sudowrite |
| Deployment | Cloud (SaaS), Browser-based | Cloud (SaaS), Browser-based |
| Support | Not stated | Email helpdesk, Community forum |
| Onboarding | Documentation and knowledge base | more entries Documentation and knowledge base, Live online demos and webinars |
| Company size | more entries Freelancers, Small and mid-sized, Enterprise | Freelancers, Small and mid-sized |
| Integrations | Chrome, Microsoft Edge, Mozilla Firefox, Opera, Google Docs, Microsoft Word, Apple Pages, LibreOffice, Gmail, Outlook, Apple Mail, Thunderbird, macOS, Windows | Not stated |
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Adds a column to the table, from the tools in this category.
Row where the values differ The small markers point at the lower number, the longer list or the stated feature. They describe the data, they are not a verdict.
The short version
Key Differences
- Starting price LanguageTool Free tier Sudowrite From $19 / month
- Free trial LanguageTool Free tier Sudowrite 7-day refund window on any plan, no free tier
- Company size LanguageTool Freelancers, Small and mid-sized, Enterprise Sudowrite Freelancers, Small and mid-sized
- Output LanguageTool Spelling, grammar, punctuation and style corrections, plus AI paraphrased sentences Sudowrite Long-form fiction and narrative
- Content types LanguageTool Checks and rewrites text the writer has already started rather than generating a content format; Premium raises the limit to 150,000 characters per text field, which covers blog articles, letters and long e-mails Sudowrite Long-form fiction and narrative
Every line is one datapoint from the table above, picked automatically. Nothing here is written text.
The trade-offs
Strengths and Limitations
LanguageTool
Strengths
- More than 30 languages and dialects in one checker
- Add-ons for browsers, Google Docs, Word, Apple Pages, LibreOffice, four mail clients and desktop apps
- Proofreading HTTP API served from Germany, with no storage of submitted text
- Source code published, so the checker can be run on your own server
Limitations
- The free tier caps the length of a single text field
- The extra Premium checks cover seven languages, not all thirty
- No editor of its own; the checker lives in add-ons and plugins
Sudowrite
Strengths
- Purpose-built for fiction, better pacing, voice and character continuity than general tools
- Genuinely useful for novels
Limitations
- Fiction only, not for marketing or SEO
- Controversial among some writers
- Not a general-purpose tool
Plans
Pricing
LanguageTool
- Free $0 Basic spelling, grammar and punctuation checking with a limit on the length of a single text field.
- Premium Not stated More than 20,000 additional checks, up to 150,000 characters per text field, unlimited AI paraphrasing and a Style Guide. Billed monthly, quarterly, annually or for two years.
- Teams Not stated All Premium features plus user management, a Team Style Guide and a Team Dictionary, priced per user for 2 to 1,000 or more users.
Sudowrite
- Hobby & Student $19 Per month, or $10 per month paid annually. 225,000 credits per month.
- Professional $29 Per month, or $22 per month paid annually.
- Max $59 Per month, or $44 per month paid annually. 2,000,000 credits per month, and unused credits roll over for 12 months.
- Enterprise Not stated On request.
What users say
Review Scores · opens after launch
LanguageTool
- Ease of use
- Not rated yet
- User interface
- Not rated yet
- Onboarding
- Not rated yet
- Support and service
- Not rated yet
- Value for money
- Not rated yet
- Features
- Not rated yet
No reviews yet. Be the first to review this tool. Every review is checked for fairness before it appears, and the vendor cannot have one removed.
Sudowrite
- Ease of use
- Not rated yet
- User interface
- Not rated yet
- Onboarding
- Not rated yet
- Support and service
- Not rated yet
- Value for money
- Not rated yet
- Features
- Not rated yet
No reviews yet. Be the first to review this tool. Every review is checked for fairness before it appears, and the vendor cannot have one removed.
Where this comes from
Where this comes from
LanguageTool https://languagetool.org · checked against the official source on 2026-09-09
Sudowrite https://www.sudowrite.com · no check date recorded yet
This table lists factual criteria taken from information the vendors publish themselves. For how we put it together, see the methodology.