Overview
LanguageTool checks grammar and style across 30+ languages, making it the practical choice for content teams publishing in multiple markets. Its AI paraphraser rewrites sentences into five distinct tones — formal, concise, fluent, simple, or general — without requiring a separate tool. The public HTTP API and self-hosted option make it unusually flexible for teams that want to embed proofreading directly into their CMS or publishing workflow.
Key Features
- ✓Grammar, spelling, and style checks in 30+ languages
- ✓AI paraphraser with five tone modes (formal, concise, fluent, simple, general)
- ✓Checks texts up to 150,000 characters on Premium
- ✓Public HTTP API and self-hosted server option
- ✓Browser extension, Google Docs, and MS Word integrations
LanguageTool Alternatives
Other AI Writing Tools tools to consider:
Grammarly
AI writing assistant with generative AI and enterprise brand controls
AI-PoweredFree / $12/mo (Pro annual)
DeepL
AI-powered translation engine with API and glossary management
AI-NativeFree (500K chars/mo) / $10.49/mo (Starter)
GPTZero
AI content detection for publishers and content teams
AI-NativeFree / $8.33/mo (Essential annual)
Copyleaks
Multilingual AI detection and plagiarism checking platform
AI-Native$7.99/mo (AI Detector)
Originality.ai
AI detection and plagiarism checker built for publishers
AI-Native$14.95/mo (Pro)