LanguageTool checks text for spelling, grammar, punctuation, casing and style errors. It detects the language you write in and supports more than 30 languages and dialects, including English, German, Spanish, French, Portuguese and Dutch. An AI paraphrasing tool rewrites sentences to be more formal, fluent, simple or concise.
It runs in the online editor, as browser add-ons (Chrome, Edge, Firefox, Opera, Safari), as desktop apps for macOS and Windows, and as add-ons for Google Docs, Microsoft Word, LibreOffice, Gmail, Outlook, Apple Mail and Thunderbird. A paid Proofreading API is offered for developers; its servers are in Germany.
The basic checker is free. Premium adds more than 20,000 extra checks for seven languages, texts up to 150,000 characters, unlimited paraphrasing and a style guide. A Teams plan adds user management and a shared dictionary.
The core is open source under LGPL 2.1 or later. You can run your own local server; AI-based rules are only available in the cloud.
People who write in one or several languages and want error-free texts, from students and professional writers to teams and businesses that need a consistent brand voice, plus developers who add proofreading to their own software.
Its core is open source under LGPL 2.1 or later, and you can run your own LanguageTool server; Grammarly is not open source.
Open-source core (LGPL 2.1 or later) that also runs on Linux, and a paid Proofreading API for developers.
The free basic checker covers spelling, grammar and punctuation in more than 30 languages; Hemingway's grammar fixes are part of the paid Editor Plus.
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