LanguageTool
According to AI Tier List, LanguageTool is rated Tier B for Grammar Correction. How we rank →
An open-source AI proofreading tool for multilingual grammar, spelling, and style correction.
LanguageTool is an open-source AI proofreading tool that detects grammar, spelling, and style issues in multiple languages. It is useful for writers, students, and professionals who require accurate and polished writing. It offers accessibility through its website, browser extensions, and various software integrations.
Best For
Tier Reason
LanguageTool maintains high practicality as a reliable, open-source-based grammar correction tool with robust multilingual support. While recent AI enhancements have improved its competitiveness, it remains in B-tier due to limitations in creative contextual processing and advanced style suggestions compared to top-tier AI writing assistants.
Strengths
Open-source, multilingual support, comprehensive error detection, various platform integrations, cost-effective pricing
Weaknesses
Lack of advanced contextual understanding, limited features in free version, accuracy variations in some languages
Recent ChangesJul 15, 2026
Enhanced AI-based grammar and style correction features, expanded support for over 30 languages, updates to desktop and browser extensions
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