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Grammarly alternatives · Writing

Open-source alternatives to Grammarly

Grammarly is not described as open source on its own site. 12 of the 67 other writing tools in this directory are open source, according to their own sites.

Grammarly has a free plan. Paid plans start at $12 per member / month, billed annually. All of them are free or have a free plan.

12 tools · Listings checked up to Oct 9, 2026 · Where the facts come from

How each one differs from Grammarly

  1. LanguageTool

    Grammar and style checker for more than 30 languages

    • LanguageTool starts at $4.99 per month on a 2-year plan ($119.80); $69.90 billed annually. Grammarly starts at $12 per member / month, billed annually.
    • Only Grammarly lists an Android app.
    • LanguageTool is open source and self-hostable, according to its own site.
    • Grammarly also covers AI agents, citations and documents.
    LanguageTool vs GrammarlyLanguageTool pricing and details

  2. LibreOffice Writer

    Free, open-source word processor for Windows, macOS and Linux

    • LibreOffice Writer is free. Grammarly starts at $12 per member / month, billed annually.
    • Only LibreOffice Writer lists a Linux app.
    • Only Grammarly lists a web app.
    • Only Grammarly lists iOS and Android apps.
    LibreOffice Writer pricing and details

  3. Typst

    Markup-based typesetting system with a collaborative web app

    • Typst starts at $7.99 per month, billed monthly ($79.99 billed yearly). Grammarly starts at $12 per member / month, billed annually.
    • Only Typst lists a Linux app.
    • Only Grammarly lists iOS and Android apps.
    • Only Grammarly lists a browser extension.
    Typst pricing and details

  4. Zettlr

    Free, open-source Markdown editor for academic writing

    • Zettlr is free. Grammarly starts at $12 per member / month, billed annually.
    • Only Zettlr lists a Linux app.
    • Only Grammarly lists a web app.
    • Only Grammarly lists iOS and Android apps.
    Zettlr pricing and details

  5. FocusWriter

    Free distraction-free word processor for Windows and Linux

    • FocusWriter is free. Grammarly starts at $12 per member / month, billed annually.
    • Only FocusWriter lists a Linux app.
    • Only Grammarly lists a web app.
    • Only Grammarly lists macOS, iOS and Android apps.
    FocusWriter pricing and details

  6. ghostwriter

    Free, open-source Markdown editor from KDE for focused writing

    • ghostwriter is free. Grammarly starts at $12 per member / month, billed annually.
    • Only ghostwriter lists a Linux app.
    • Only Grammarly lists a web app.
    • Only Grammarly lists macOS, iOS and Android apps.
    ghostwriter pricing and details

  7. MarkText

    Free, open-source Markdown editor with in-place live rendering

    • MarkText is free. Grammarly starts at $12 per member / month, billed annually.
    • Only MarkText lists a Linux app.
    • Only Grammarly lists a web app.
    • Only Grammarly lists iOS and Android apps.
    MarkText pricing and details

  8. Manuskript

    Free, open-source novel planner with an outliner and index cards

    • Manuskript is free. Grammarly starts at $12 per member / month, billed annually.
    • Only Manuskript lists a Linux app.
    • Only Grammarly lists a web app.
    • Only Grammarly lists iOS and Android apps.
    Manuskript pricing and details

  9. novelWriter

    Free, open-source plain-text editor for writing novels

    • novelWriter is free. Grammarly starts at $12 per member / month, billed annually.
    • Only novelWriter lists a Linux app.
    • Only Grammarly lists a web app.
    • Only Grammarly lists macOS, iOS and Android apps.
    novelWriter pricing and details

  10. bibisco

    Novel planning and writing software built around characters

    • bibisco starts at $3.49 per month for Everywhere sync; desktop Supporters Edition is $69 one-time. Grammarly starts at $12 per member / month, billed annually.
    • Only bibisco lists a Linux app.
    • Only Grammarly lists a web app.
    • Only Grammarly lists a browser extension.
    bibisco pricing and details

  11. Trelby

    Free, open-source screenwriting program for desktop

    • Trelby is free. Grammarly starts at $12 per member / month, billed annually.
    • Only Trelby lists a Linux app.
    • Only Grammarly lists a web app.
    • Only Grammarly lists iOS and Android apps.
    Trelby pricing and details

  12. Beat

    Free, open-source Fountain screenwriting app for Mac and iOS

    • Beat starts at $11.99 one-time for the iOS app. Grammarly starts at $12 per member / month, billed annually.
    • Only Grammarly lists a web app.
    • Only Grammarly lists Windows and Android apps.
    • Only Grammarly lists a browser extension.
    Beat pricing and details

Common questions

Is there an open-source alternative to Grammarly?

Yes. LanguageTool, LibreOffice Writer, Typst, Zettlr, FocusWriter, ghostwriter, MarkText, Manuskript and 4 more are open source, according to their own sites.

Is Grammarly open source?

Grammarly is not described as open source on its own site. The listing was checked on Oct 5, 2026 against the pages it cites.

When was this checked?

Each listing shows its own date. On this page they run from Oct 5, 2026 to Oct 9, 2026. Vendors change prices and plans without notice, so confirm on their site before you buy.

This page is built from the listings. A tool is here because its listing says so, and the order is how close each is to Grammarly: the alternatives its listing names first, then the tools that share the most features with it.