# LanguageTool

**Canonical:** https://apis.io/providers/languagetools/  
**Website:** https://languagetool.org  
**APIs profiled:** 3

Open-source grammar, style, and spell checking REST API supporting 25+ languages with AI-powered error detection, style suggestions, and text improvements. Used by 100+ companies to enhance software with proofreading capabilities via a simple HTTP API returning JSON responses. Hosted on GDPR-compliant servers in Germany with no text storage.

## Kin Score — 32.5 / 100 (thin)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 32.5).

| Facet | Score |
|---|---|
| Discoverability | 74.1 |
| Contract Quality | 43.4 |
| Governance | 9.8 |
| Contract Governance | 9.8 |
| Operational Transparency | 5.3 |
| Developer Ergonomics | 11.9 |
| Commercial Clarity | 50.0 |
| Access Clarity | 50.0 |

## Agent readiness — 20.5 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Freemium — onboarding: unknown, pricing: freemium, trial: no (confidence: medium).

## APIs (3)

- **LanguageTool Check API** — The Check API from LanguageTool — 1 operation(s) for check.
- **LanguageTool Languages API** — The Languages API from LanguageTool — 1 operation(s) for languages.
- **LanguageTool Words API** — The Words API from LanguageTool — 3 operation(s) for words.

## Agentic access (1)

- **Languagetools Agentic Access** — 5 operations · 3 acting

## Security (1)

- **Languagetools Domain Security** — TLSv1.3 · DMARC

## Plans (1)

- **Plans**

## Tags

Grammar, Spell Check, Styles, Proofreading, NLP, Natural Language Processing, Writing, Open-Source

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/languagetools/). Scores are computed from the provider's own public artifacts under a published rubric.