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. ProWritingAid
At a glance
At a glance
Best for
Best for authors and long-form writers who want deep style reports and story critique inside the app they already write in.
- Freelancers
Cataleo does not name a winner. Both statements come from the vendors themselves.
Full Comparison
| Criterion | LanguageTool | ProWritingAid |
|---|---|---|
| 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. | Free tier; Premium from $10 / month $10 per month billed yearly ($120 a year), $30 billed monthly. Premium Pro is $12 billed yearly ($144) or $36 monthly. Lifetime licences are $399 (Premium) and $699 (Premium Pro). |
| Free trial | Free tier | Free plan with a 500-word limit, 2 report runs per report per day, 10 rephrases and 3 Sparks per day |
| Output | Spelling, grammar, punctuation and style corrections, plus AI paraphrased sentences | Grammar and style suggestions, 25+ writing reports, rephrasing and story critique |
| 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 | Cloud, with desktop apps for Windows and macOS and browser extensions |
| 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 | Fiction manuscripts and general prose; more than 40 document types can be set for tailored suggestions |
| 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 | Custom style guide with your own rules, plus terminology management from an uploaded term base (Premium and above) |
| 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 | Yes, more than 25 writing analysis reports covering readability, structure, overused words and sensory detail, plus comparison against 90 fiction authors |
| Drafting tools | Yes, an AI paraphrasing tool that rewrites a sentence to be more formal, more fluid or shorter, uncapped on Premium | Rephrase and Sparks rewrite, enhance, summarize, expand or continue text; the vendor states its AI features are not intended to write for you |
| 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; Snippets store frequently used pieces of text for reuse |
| 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 | Document sharing with real-time comments; the published plans are individual rather than team seats |
| 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 | Yes, a Grammar and Style checking API at api.prowritingaid.com, licensed and paid for separately from the writing subscription. The licence covers unlimited servers and locations but forbids shipping it inside an SDK or using it to build a competing checker |
| Deployment | Cloud (SaaS), Browser-based | Cloud (SaaS), Browser-based |
| 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 |
| Integrations | more entries Chrome, Microsoft Edge, Mozilla Firefox, Opera, Google Docs, Microsoft Word, Apple Pages, LibreOffice, Gmail, Outlook, Apple Mail, Thunderbird, macOS, Windows | Microsoft Word, Google Docs, Scrivener, Vellum, Apple Notes, Atticus, Wattpad, Chrome, Edge, Firefox |
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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 ProWritingAid Free tier; Premium from $10 / month
- Free trial LanguageTool Free tier ProWritingAid Free plan with a 500-word limit, 2 report runs per report per day, 10 rephrases and 3 Sparks per day
- Company size LanguageTool Freelancers, Small and mid-sized, Enterprise ProWritingAid Freelancers
- Hosting LanguageTool Cloud (SaaS), API servers in Germany; the source code is published for self-hosting ProWritingAid Cloud, with desktop apps for Windows and macOS and browser extensions
- Output LanguageTool Spelling, grammar, punctuation and style corrections, plus AI paraphrased sentences ProWritingAid Grammar and style suggestions, 25+ writing reports, rephrasing and story critique
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
ProWritingAid
Strengths
- More than 25 reports go well past grammar into structure, pacing and overused words
- Story-level critique covers chapters, plot, characters and marketability
- Edits in place in Microsoft Word, Scrivener, Vellum, Google Docs and the browser
- Lifetime licence available as a one-time payment
- Vendor states it never uses your writing to train its algorithms
Limitations
- Free plan is capped at 500 words per document
- Built for authors and prose rather than marketing content at volume
- AI features are deliberately assistive and will not draft for you
- Manuscript-wide analyses are metered separately through Story Credits
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.
ProWritingAid
- Free $0 500 word count limit, 2 runs per report per day, 10 rephrases and 3 Sparks per day.
- Premium $30 Per month billed monthly. $10 per month billed yearly ($120 a year), or a $399 one-time lifetime licence. Unlimited word count, reports and rephrases, custom style guide, 5 Sparks and 1 Chapter Critique per day.
- Premium Pro $36 Per month billed monthly. $12 per month billed yearly ($144 a year), or a $699 one-time lifetime licence. Adds 50 Sparks and 3 Chapter Critiques per day plus live workshops and the on-demand workshop library.
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.
ProWritingAid
- 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
ProWritingAid https://prowritingaid.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.