What is LanguageTool?
Free proofreading tool for LibreOffice, Apache OpenOffice, Microsoft Word, Ulysses, Mozilla Firefox, Microsoft Edge and Google Chrome. Also, available as a standalone application. Supports about 20 languages (on different levels) and allows customization.
Free – 10,000 characters per check • Thousands of patterns for finding errors in English, German, French, …
Premium – 100,000 characters per check • Thousands of patterns for finding errors in English, German, French, … • Add-on for Microsoft Word (more…) – no character limit • Detection of wrong gender in salutation (German only) • Additional word pairs for statistical detection of typos for English, German, and French • Detection of incorrect checksums in ISBN and IBAN numbers • Detection of more than 2500 additional errors for English, German, French, and Dutch
PS: The Web Version and Desktop App are open source. However, the browser extensions are no longer Open source.
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