LanguageTool
Your writing assistant
LanguageTool is an AI-based writing assistant that checks grammar, spelling, punctuation, casing, and style across more than 30 languages and dialects, with automatic language detection. It also includes an AI paraphrasing tool for rewording sentences to be more formal, fluent, simple, or concise. The product began in 2003 as an open-source project, and its core technology remains open source, allowing users to set up their own server.
Features include a web editor with a personal dictionary, writing statistics, and a Picky Mode for additional punctuation, style, and typography suggestions. It integrates through browser add-ons (Chrome, Edge, Firefox, Opera, Safari), office plugins (Google Docs, Microsoft Word, Apple Pages, LibreOffice), email add-ons (Gmail, Apple Mail, Thunderbird, Outlook), and desktop and mobile apps for Windows, macOS, and iOS. A proofreading API is available for businesses, along with team accounts and GDPR-conform solutions.
LanguageTool offers a free version covering spelling, simple punctuation, and some style checks, while a Premium plan adds enhanced grammar, punctuation, and style checking, a larger character limit per text field, unlimited AI paraphrasing, and a Style Guide for custom rules. Premium is available on monthly, quarterly, annual, and multi-year payment intervals.
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