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 August 2026 · 6 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	14,750	LGPL-2.1-or-later	LinuxmacOSWindowsDocker	Yes	Aug 2026	Visit
Vale	5,700	MIT	LinuxmacOSWindows	No	Aug 2026	Visit
alex	5,095	MIT	LinuxmacOSWindows	No	Nov 2024	Visit
write-good	5,077	MIT	LinuxmacOSWindows	No	Mar 2025	Visit
proselint	4,555	BSD-3-Clause	LinuxmacOSWindows	No	Jul 2026	Visit
textlint	3,163	MIT	LinuxmacOSWindows	No	Aug 2026	Visit