Home / Writing & Grammar Tools / Alternatives to Grammarly

1 open source alternatives to Grammarly

AI-powered grammar, spelling and tone checker. Here are the open source projects real teams use instead — ranked by fit, with honest pros and cons for each.

What people don't love about Grammarly

  • Cloud-based — your writing is sent to Grammarly servers.
  • Premium features are paywalled aggressively.
  • Browser extension can feel invasive.

Current Grammarly pricing (for reference): Free tier; Premium from $12/month.

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Quick comparison

Alternative Best for License Self-host Hosted cloud?
LanguageTool
Open source grammar, spelling and style checker. 		Grammar and style checking that can run fully offline on your server. LGPL-2.1 ★★☆☆☆ Yes

1. LanguageTool — Grammar and style checking that can run fully offline on your server.

Open source grammar, spelling and style checker.

Strengths

  • Supports 25+ languages.
  • Self-hostable — your text never leaves your server.
  • Browser extensions and editor integrations.

Weaknesses

  • Grammar feel less polished than Grammarly on edge cases.
  • Premium rules require paid tier or self-host config.
  • Java-based deployment footprint.
License: LGPL-2.1 Self-host difficulty: 2/5 Hosted cloud optionDesktop: Windows, macOS, Linux

LanguageTool homepage · Source on GitHub · Grammarly vs LanguageTool →

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