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LanguageTool

Grammar, spelling, punctuation and style checker for more than 30 languages

Sumber terbuka Web Mac Windows Linux Ekstensi browser API / CLI

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.

Dibuat untuk

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.

Kasus penggunaan

Check emails and documents for spelling and grammar errors
Fix punctuation and casing mistakes
Rephrase sentences to be more formal or concise
Check texts in several languages with automatic language detection
Keep a team's wording consistent with a shared style guide
Add proofreading to an app through the HTTP API

Alternatif untuk

Grammarly
Its core is open source under LGPL 2.1 or later, and you can run your own LanguageTool server; Grammarly is not open source.
Quillbot
Open-source core (LGPL 2.1 or later) that also runs on Linux, and a paid Proofreading API for developers.
Hemingway Editor
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.