- Pick it if you are:
- Non-native English speakers; Professional email writers
- Top complaint:
- Suggestions often incorrect or change intended meaning
- Price:
- Free plan, paid from $15/mo
- Pick it if you are:
- Writers in German, French, Spanish, Dutch or Portuguese; Non-native English speakers writing in two languages
- Top complaint:
- LanguageTool browser extension is no longer free
- Price:
- Free plan, paid from $16.63/mo
Score Comparison
Signals Comparison
Grammarly
- Grammarly refund denied - refunds only where required by law(8/10)
- Automatic renewal charges without clear notice(8/10)
LanguageTool
- LanguageTool browser extension is no longer free(9/10)
- Why is LanguageTool Premium so expensive monthly?(6/10)
- LanguageTool free version limits: 2,000 characters and 3 AI rephrases a day(6/10)
Grammarly
- AI update backlash - users hate forced generative features(8/10)
- Constant upgrade prompts disrupt writing flow(6/10)
- Grammarly icon replaced by Superhuman logo after Superhuman Go activation(5/10)
- Icon obstruction blocks important buttons(5/10)
LanguageTool
- LanguageTool keeps detecting the wrong language(5/10)
- LanguageTool less accurate than Grammarly for English(5/10)
- LanguageTool false positives and irrelevant suggestions(4/10)
Grammarly
- Suggestions often incorrect or change intended meaning(8/10)
- Overly rigid suggestions harm creative writing(7/10)
- Plagiarism checker accuracy is poor(7/10)
- AI detector falsely flags non-AI content(7/10)
- GrammarlyGO content sounds bland and generic(6/10)
- Weak spell-check doesn't recognize common misspellings(5/10)
LanguageTool
- LanguageTool extension uses huge memory and crashes Firefox(8/10)
- LanguageTool slows LibreOffice with large documents(5/10)
Grammarly
- Grammarly desktop app crashes, disappears or won't stay logged in(8/10)
- Requires internet - useless with slow connection(6/10)
LanguageTool
- LanguageTool not working in Google Docs after updates(7/10)
- LanguageTool not working in Overleaf(6/10)
Grammarly
- Grammarly for Microsoft Office add-in retired - Word users forced to desktop app(7/10)
LanguageTool
- LanguageTool Word add-in suggestions don't apply(7/10)
Grammarly
- Slow customer support and refund denial(6/10)
LanguageTool
- LanguageTool support slow, forum no longer monitored(6/10)
Grammarly
- Privacy concerns with text sent to AI providers(6/10)
LanguageTool
No signals
Grammarly
No signals
LanguageTool
- LanguageTool mobile keyboard limited, especially on Android(4/10)
Grammarly
No signals
LanguageTool
- Self-hosting LanguageTool to stay free takes work(5/10)
Pricing Comparison
Grammarly
Users: 1 user
Limits: No plagiarism checker or AI detector, no full-sentence rewrites
Users: Up to 149 seats
Limits: Per-member pricing; prompts capped at 2,000/month
Users: Up to 149 seats
Limits: Not shown on the main plans page - listed in the help center
Users: Up to 149 seats
Limits: 12-month commitment
Limits: Cannot be merged with an existing Grammarly subscription
Limits: Mostly worth it only if you also want Superhuman Mail
Users: Unlimited
Limits: Sales process required
LanguageTool
Users: 1 user
Storage: 2,000 characters per text field
Limits: No browser extension, 2,000-character limit per check, 3 AI rephrases per day, limited style (Picky) checks, no personal style guide
Users: 1 user
Storage: 150,000 characters per text field
Users: 1 user
Storage: 150,000 characters per text field
Users: 1 user
Storage: 150,000 characters per text field
Users: 1 user
Storage: 150,000 characters per text field
Users: 2 to 1,000 users
Feature Comparison
| Feature | Grammarly | LanguageTool |
|---|---|---|
| Core Features | ||
| Grammar & spelling check Free tier includes | ||
| Punctuation check Free tier includes | ||
| Tone detection Basic free, full Pro | ||
| Multiple languages Writing checks in 6 languages per Superhuman plans page; deepest support is English | ||
| Checking | ||
| Multilingual grammar and spell check Strongest outside English | ||
| Integrations | ||
| Browser extension Premium-only, or free with a self-hosted server | ||
| Google Docs add-on | ||
| Microsoft Word add-in | ||
| LibreOffice extension | ||
| Browser extensions Chrome, Firefox, Edge, Safari | ||
| Desktop apps Windows, Mac - unstable | ||
| Mobile keyboards iOS, Android | ||
| Google Docs integration Browser extension; known issues with footnotes, tables and 30+ page docs | ||
| Microsoft Word integration Via Grammarly for Windows/Mac desktop app; Office add-in being retired, Word-on-Mac add-in discontinued | ||
| Pro Features | ||
| Full-sentence rewrites Pro only | ||
| Plagiarism checker Pro only, low accuracy | ||
| AI Features | ||
| Generative AI prompts 100 Free, 2,000 Pro, unlimited Enterprise per month | ||
| AI | ||
| AI paraphrasing 3 per day free, unlimited on Premium | ||
| Style | ||
| Personal and team style guide Premium / Teams | ||
| Privacy | ||
| Self-hosted server Open source, needs Java | ||
| Mobile | ||
| iOS keyboard Requires Full Access | ||
| Usability | ||
| Offline mode Requires internet | ||
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