| | Free & Open Source Free tier with core grammar and spell checking; Premium at ~$5/month adds advanced style, clarity, and plagiarism detection. | An open-source grammar, style, and spell checker supporting over 30 languages, available as a browser extension, desktop app, and self-hosted service. | - Open source under LGPL — self-host for unlimited checks with complete privacy
- Supports over 30 languages, far exceeding Grammarly's language coverage
| - AI-powered style and clarity suggestions require the paid Premium plan
- Writing tone and engagement scoring is not as polished as Grammarly Premium
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| H Hemingway Editor | Free Free to use in the browser at hemingwayapp.com with full functionality; one-time $19.99 purchase for the desktop app. | A writing tool that highlights complex sentences, passive voice, and readability issues to help you write clearly and concisely. | - Free to use in the browser with no account or sign-up required
- Focuses on clarity and readability rather than rigid grammar rules
| - Not open source; works only within its own editor with no integrations or API
- Does not check grammar or spelling — purely style and readability feedback
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| V Vale | Free & Open Source | An open-source command-line prose linter that enforces custom style guides for Markdown, AsciiDoc, HTML, and other markup formats. | - Fully open source under MIT — extend, fork, or self-host with no restrictions
- Highly configurable via custom rules; supports Google, Microsoft, and Write Good style guides
| - Command-line only — no GUI or browser extension; not suitable for non-technical users
- Requires setup and configuration before use; not a drop-in replacement for Grammarly
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