LanguageTool

Open-source grammar and style checker for 25+ languages, with browser add-ons, a self-hosted server and a paid Premium plan.

Open source

Unknown

This replaces Grammarly

Facts

Made by: LanguageTool
Website: languagetool.org
License: License: Open sourceLGPL-2.1-or-later
Pricing: Free tier with paid plansThe free hosted plan checks up to 2,000 characters per field with 3 AI paraphrases a day. Premium raises both.
Platforms: Windows
macOS
Linux
Web
iOS
Self-hosted
Self-hostable: Yes
Works offline: Yes
Account required: No
Telemetry: Browser add-ons and apps send text to the hosted service for checking. A self-hosted server keeps text on your own machine.
Maturity: Stable
Source code: github: languagetool-org/languagetool
Maintenance: Status: Unknown

Grammarly
Top pick. Best for multilingual checking in browsers and Office.
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