LanguageTool
Multilingual proofreading with a privacy-first stance.
Overview
LanguageTool corrects grammar and style across more than 30 languages, is open source at its core, and can be self-hosted for private use.
Teams reach for LanguageTool when multilingual proofreading with a privacy-first stance. It sits in the freemium bracket (Free tier · Premium from €4.99/mo) and is reviewed by AIAtlas editors against the tasks people actually bring to it, not marketing claims.
Best for
Where this tool consistently outperforms alternatives.
- Students
- Businesses
- Non-native speakers
Pricing
Indicative plans — always confirm on the official site.
Free
$0
Everyday use with fair limits.
- Core features
- Community support
- Usage caps
Paid
PopularPremium from €4.99/mo
For individuals and small teams shipping daily.
- Highest-quality models
- Priority speed
- Full history and exports
Enterprise
Custom
Security, control and volume pricing.
- SSO and audit logs
- Data residency options
- Dedicated support
Pros & cons
Pros
- Best multilingual coverage
- Can be self-hosted privately
- Affordable premium tier
Cons
- Style advice lighter than rivals
- Fewer generative features
Key features
What you actually get day to day.
30+ languages supported
Open-source core with self-hosting
Browser, Word and desktop apps
AI rephrasing on premium
Alternatives
Four similar tools worth comparing before you commit.
Frequently asked questions
Ready to try this AI?
Start with LanguageTool on the official site — Free tier · Premium from €4.99/mo.