LanguageTool

LanguageTool is the world's most widely used open source grammar checker for languages other than English. If you write in Italian, German, French, Spanish or dozens of other languages, it's probably the most accurate tool available for correcting and improving your text.

LanguageTool is a grammar, spelling and style checker based on linguistic rules and artificial intelligence, available for over 30 languages. It distinguishes itself from English-focused competitors like Grammarly by its multilingual coverage: while Grammarly is optimized almost exclusively for English, LanguageTool offers in-depth correction for major European languages. It corrects grammatical, spelling and punctuation errors, flags false friends in Romance languages, suggests synonyms, identifies inappropriate register and proposes reformulations to improve clarity. It's available as an extension for Chrome, Firefox and Edge, as a desktop app, as a standalone web editor, and as a plugin for Word, LibreOffice, Google Docs and other writing tools. The source code is public and the server version can be self-hosted, an option valued by companies and institutions that want to keep their data internal. The free version covers most correction needs; the Premium version adds advanced style suggestions, plagiarism detection, more sentences checked per request and an AI paraphrasing feature.

For anyone writing in Italian or another European language who wants an accurate grammar and style correction tool, from the individual user to the company that prefers to keep data in-house.

LanguageTool offers a free version with around 20 suggestions per text and basic corrections. The Premium version starts at $4.99 per month billed annually ($9.99 monthly) and unlocks unlimited suggestions, advanced style, plagiarism detection, AI paraphrasing and a higher character limit per request. A Team plan for multiple users and a self-hosted option for those who want to install the server internally are also available.