Best Open Source Alternatives to Grammarly

Compare the best free and open-source alternatives to Grammarly — self-hosted and desktop replacements you fully control, ranked by GitHub stars, license and platform support.

Curated by open-source.store · Updated November 2026 · 5 alternatives

Grammarly

Proprietary SaaS

PricingFreemium

Platformsweb, desktop, mobile, windows, macos, android, ios

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Grammarly alternatives compared

Open-source alternatives to Grammarly, compared by stars, license and platform
Tool		License	Platforms	Self-hosted
LanguageTool	15,229	LGPL-2.1	LinuxmacOSWindowsDocker	Yes	Nov 2026	Visit
Vale	6,317	MIT	LinuxmacOSWindows	No	Oct 2026	Visit
write-good	5,107	MIT	LinuxmacOSWindows	No	Mar 2025	Visit
proselint	4,593	BSD-3-Clause	LinuxmacOSWindows	No	Sep 2026	Visit
textlint	3,204	MIT	LinuxmacOSWindows	No	Oct 2026	Visit

Top open-source Grammarly alternatives

LanguageTool15,229LGPL-2.1

Open-source grammar and style checker for 30+ languages, offering free proofreading and local hosting as an alternative to Grammarly.

LinuxmacOSWindowsDockerWeb

vs Grammarly: a free, open-source option you fully control, licensed LGPL-2.1.

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Vale6,317MIT

Vale is an open-source prose linter that replaces cloud grammar checkers with fast, local style guide enforcement in documentation pipelines.

LinuxmacOSWindows

vs Grammarly: a free, open-source option you fully control, licensed MIT.

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write-good5,107MIT

write-good is an open-source prose linter that replaces paid writing assistants with free, offline command-line checks for passive voice and wordiness.

LinuxmacOSWindows

vs Grammarly: a free, open-source option you fully control, licensed MIT.

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