Best for
Best for individuals and teams who want grammar, clarity and tone help across every app they write in.
- Freelancers
- Small and mid-sized
- Enterprise
AI Writing Comparison
Grammarly vs. LanguageTool
At a glance
At a glance
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
Cataleo does not name a winner. Both statements come from the vendors themselves.
Full Comparison
| Criterion | Grammarly | LanguageTool |
|---|---|---|
| Starting price | Free tier; Pro from $12 / user / month $12 per member per month billed annually, $30 billed monthly. Enterprise is custom. | 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 trial | Free tier with 100 AI prompts per month | Free tier |
| Commercial use | Yes | Not stated |
| Output | Grammar, clarity and tone suggestions, plus generative AI drafts | Spelling, grammar, punctuation and style corrections, plus AI paraphrased sentences |
| Languages | Not stated | More than 30 languages and dialects, with six English varieties |
| Hosting | Not stated | Cloud (SaaS), API servers in Germany; the source code is published for self-hosting |
| Content types | Emails, documents, business and academic writing | 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 |
| Brand voice | Yes, brand tone and style guide (unlimited on Enterprise) | 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 |
| Content scoring | Yes, writing performance score and tone detection | 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 |
| Drafting tools | Yes, generative AI prompts, rewrites and tone adjustments | Yes, an AI paraphrasing tool that rewrites a sentence to be more formal, more fluid or shorter, uncapped on Premium |
| Templates | No preset template library; generation runs from prompts and built-in AI agents | 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 |
| Team workflows | Yes, team analytics, snippets and shared style guide | 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 |
| API | No public API; the Text Editor SDK for developers was discontinued in 2024 | 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 |
| Deployment | Cloud (SaaS), Browser-based | Cloud (SaaS), Browser-based |
| Onboarding | Not stated | Documentation and knowledge base |
| Company size | Freelancers, Small and mid-sized, Enterprise | Freelancers, Small and mid-sized, Enterprise |
| Integrations | Not stated | Chrome, Microsoft Edge, Mozilla Firefox, Opera, Google Docs, Microsoft Word, Apple Pages, LibreOffice, Gmail, Outlook, Apple Mail, Thunderbird, macOS, Windows |
Add a tool
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 Grammarly Free tier; Pro from $12 / user / month LanguageTool Free tier
- Free trial Grammarly Free tier with 100 AI prompts per month LanguageTool Free tier
- Output Grammarly Grammar, clarity and tone suggestions, plus generative AI drafts LanguageTool Spelling, grammar, punctuation and style corrections, plus AI paraphrased sentences
- Content types Grammarly Emails, documents, business and academic writing 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
- Brand voice Grammarly Yes, brand tone and style guide (unlimited on Enterprise) LanguageTool 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
Every line is one datapoint from the table above, picked automatically. Nothing here is written text.
The trade-offs
Strengths and Limitations
Grammarly
Strengths
- Free tier is genuinely useful for everyday writing
- Works across apps and browsers through extensions
- Brand tones and style guides keep a consistent voice
Limitations
- Generative AI is capped by monthly prompt limits
- Enterprise pricing is custom, not published
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
Plans
Pricing
Grammarly
- Free $0 100 AI prompts per month.
- Pro $12 Per member per month billed annually. $30 billed monthly.
- Enterprise Custom Contact sales.
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.
What users say
Review Scores · opens after launch
Grammarly
- 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.
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.
Where this comes from
Where this comes from
Grammarly https://www.grammarly.com · no check date recorded yet
LanguageTool https://languagetool.org · checked against the official source on 2026-09-09
This table lists factual criteria taken from information the vendors publish themselves. For how we put it together, see the methodology.