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Lexicon

Free#24 of 88 in Grammar Checkers

Lexicon: A free, open-source editor for local proofreading, rewriting, and document workflows. Ranked #24 of 88 in Grammar Checkers by our editors (6.3/10); pricing: Free plan; best for privacy-focused local writing workflows.

6.3/10Editor score

Visit Lexicon

Lexicon6.3 Visit Lexicon

At a glance

Editor score
6.3 / 10
Pricing
Free plan
Best for
Privacy-focused local writing workflows
Free plan
Yes
Paid from
Free
Tone detection
Yes
Facts checked
21 Sep 2026

Where it wins
- Local grammar, spelling, style, tone, and readability tools
- Rich editing plus PDF and Markdown import/export
- Open-source desktop apps with Ollama and LM Studio support
Where it doesn't
- Browser extension is beta
- The extension requires the desktop app to be running
- Local AI features require bundled models or configured local servers

Our verdict on Lexicon

Lexicon is a free, open-source desktop writing application for drafting, proofreading, rewriting, tone adjustments, and document export. It is designed for writers who want offline-capable editing without an account or subscription. The application runs on Windows, macOS, and Linux, and combines local grammar, spelling, and style proofreading with rich-text editing. Its editor supports headings, lists, tasks, tables, images, and code blocks, making it suitable for both standard writing and structured documents.

Its strongest distinction is the breadth of local writing assistance. Inline suggestions can be applied or dismissed, while tone detection, clarity checks, and readability scoring add review beyond basic spelling correction. Lexicon also includes local AI rewriting, summarization, and tone transformations. For users with custom terminology, the personal dictionary provides a way to preserve preferred vocabulary. Document workflows extend to import and export for common formats, including PDF and Markdown. Optional local AI connectivity through Ollama and LM Studio gives technically oriented users additional model options.

Lexicon is a good fit for privacy-focused writers who want an open-source desktop workflow with proofreading, rewriting, and document handling in one application. Its browser extension broadens proofreading to supported web fields, but the extension is beta and requires the desktop app to be running. That makes it less suitable for users seeking a mature, browser-first checker that works independently of a desktop application. Writers who prioritize local processing, offline-capable editing, and control over AI connections should consider Lexicon; those who need a standalone web workflow should look elsewhere.

Your product? Our editors can test Lexicon in depth and publish a review, labelled as paid · from $149/mo →

Lexicon pricing

Plans Free planFree Free to use — no paid tier required for the core job.

See plans on lexicon-writer.pages.dev

Lexicon fact sheet

Free plan	Yes
Paid from	Free
Browser extension	Yes
Desktop app	Yes
Mobile app	Not verified
Style suggestions	Yes
Tone detection	Yes
Languages supported	Not verified
Deployment	Desktop, Browser extension
Platforms	Windows, macOS, Linux, Chrome extension
Support	Community
Built for	Solo, Small business (editorial estimate)
Integrations	2 integrations: Ollama, LM Studio
Pricing	Free plan
Website	lexicon-writer.pages.dev
Facts checked	21 Sep 2026

Lexicon integrations

Lexicon lists 2 integrations on its own site.

Ollama
LM Studio

Alternatives to Lexicon

See all Lexicon alternatives →

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The editor score above is our own research. What this page doesn't have yet is a reader's view — what you used Lexicon for, what worked and what didn't. No stars are seeded and no review is paid for; an editor reads every one before it appears.

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Featured on iTechGuides

Lexicon is listed in our Grammar Checkers directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 7 Oct 2026 · How we research and update