LanguageTool API
Text Analysis · Operational · 30d uptime 100%
Instantly check grammar, punctuation, and spelling errors with LanguageTool's AI-powered grammar checker. Enhance your writing in over 30 languages with ease.
Trust signals
Pricing
FREEMIUM
Auth
API_KEY
CORS
Yes
Rate limit
20 requests per minute on public free endpoint
Health
317ms
Trust score
94 (A)
Last checked Sep 4, 2026 · uptime 24h 100% / 7d 100% / 30d 100%
Excellent production-readiness signals.
Links
- Homepagelanguagetool.org
- Documentationlanguagetool.org/http-api/swagger-ui/default/
- Base URLlanguagetool.org/http-api/swagger-ui/default/
Integration checklist
- Auth is API_KEY— no credit card required
- CORS enabled — callable directly from browsers.
- Rate limit: 20 requests per minute on public free endpoint