AI Grammar Checker: LanguageTool + Local LLM for Private Writing

An AI grammar checker that is free and private: LanguageTool for rules, a local LLM for style. Real comparison with GitHub star data.

💡 What You Will Learn

An AI grammar checker that is free and private: LanguageTool for rules, a local LLM for style. Real comparison with GitHub star data.

Grammarly reviews your text - and stores it. The private alternative: LanguageTool for deterministic grammar rules plus a local LLM for style and tone suggestions.

The Stack

LanguageTool (14,773 stars) is the open-source grammar and style checker supporting 25+ languages - it catches the rule-based errors with high precision. The LLM layer via Ollama (177,874 stars) handles what rules cannot: tone, clarity, restructuring suggestions. Together they cover both deterministic errors and subjective style.

Why Private Matters

Your drafts are your property. Cloud checkers train on and store your writing; a local pipeline keeps everything on disk. For journalists, authors, and anyone writing about sensitive topics, that is a decisive advantage.

FAQ

Q: Is the LLM as good at style as Grammarly?
A: Different - the LLM gives broader suggestions but can hallucinate; LanguageTool is precise. Use them as a team.

Q: Does it work in Chinese?
A: LanguageTool covers Chinese; for style, use a Chinese-capable model like Qwen2.5 (27,479 stars).