LanguageTool
Style and Grammar Checker for 25+ Languages.
About LanguageTool
LanguageTool provides a REST API for checking text for grammar and style issues, accessible via api.languagetoolplus.com/v2. Core endpoints include checking a text, retrieving supported languages, and listing, adding, or deleting words in dictionaries.
Usage is subject to default limits that vary by plan: requests per minute, characters per minute, and characters per request are all capped, with higher thresholds available on the Premium tier than the free tier. Higher limits than either tier offers are available through separate proofreading API plans.
The API is suited for developers integrating grammar and style checking into applications, such as text editors or writing tools, that need programmatic access to language-checking functionality and dictionary management.
Key features
- Grammar and style checking via REST API
- Text checking endpoint (POST /check)
- Supports multiple languages (GET /languages)
- Personal dictionary management (list, add, delete words)
Frequently asked questions
Is there a free tier?
Yes, the free plan allows 20 requests per minute, 75,000 characters per minute, and 20,000 characters per request.
What are the limits on the paid plan?
The Premium plan allows 80 requests per minute, 300,000 characters per minute, and 60,000 characters per request.
What can the API do?
It checks text for grammar and style issues, lists supported languages, and manages words in a personal dictionary.
Can I get higher rate limits?
Yes, higher limits are available through the Proofreading API plans.
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