LanguageTool

LanguageTool is an AI-based writing assistant checking spelling, grammar, punctuation, capitalization, and style, plus a paraphrasing feature — trusted by 2,000+ organizations including Spiegel Magazine, Deutsche Presse-Agentur, and JetBrains. It supports 30+ languages and dialects, ships browser extensions for Chrome, Firefox, Edge, Safari, and Opera, integrates directly with Google Docs, Microsoft Word, Apple Pages, and LibreOffice, and has native desktop apps for Windows and macOS. A "Picky Mode" adds advanced punctuation and style suggestions beyond the default check level. The free tier covers basic spelling and punctuation; Premium (discounted at signup) unlocks comprehensive error detection and the enhanced feature set. Good fit for a multilingual writer or team that needs grammar checking across 30+ languages rather than an English-only tool, with the option to work directly inside Word, Docs, or LibreOffice.