replacing Grammarly

Open Source Grammarly Alternatives

AI writing assistant and grammar checker — Grammarly pricing: $12-$15/member/month. Below: 1 free, self-hostable open source projects that cover the same ground, ranked by real GitHub adoption.

There is 1 open source Grammarly alternative tracked on this registry, against Grammarly pricing of $12-$15/member/month. The most-adopted is LanguageTool with 15,225 GitHub stars under LGPL-2.1, written in Java. Together the set has 15,225 stars across 1 language and 1 licence. All 1 are free to self-host with no licence fee, and 1 of 1 received a commit in the last 90 days. 1 head-to-head Grammarly comparison are available.

Grammarly's Business plan at $15/member/month adds style guides and analytics. All text processing happens on Grammarly's servers — your writing is their data. No self-hosting option.

Grammarly vs LanguageTool →

Our top 1 Grammarly alternatives

LanguageTool ★ 15K

LanguageTool is open-source proofreading software for English, Spanish, French, German, Portuguese, Polish, Dutch, and more than 20 other languages. Its tagline describes it as an AI-powered grammar checker for 30+ languages, while the repository description calls it a style and grammar checker for 25+ languages. The project lives in the natural-language processing and productivity ecosystem, where it helps writers, editors, and applications detect errors that a simple spell checker cannot find.

LGPL-2.1 · Java · Grammarly vs LanguageTool →

LanguageTool ★ 15K

AI-powered grammar checker for 30+ languages

rank001 licenseLGPL-2.1 written inJava

last updated nightly · ranking method: github stars, live-tracked

Frequently asked questions

What is the best open source alternative to Grammarly?

LanguageTool is the most-starred open source alternative to Grammarly in this registry, with 15,225 GitHub stars. 1 alternatives are compared here in total.

Are there free alternatives to Grammarly?

Yes. Every project listed on this page is open source and free to self-host — there is no licence fee. Some projects also sell a managed hosted version, but the self-hosted path costs nothing.

What should I look at when replacing Grammarly?

Compare licence terms, community size (stars), primary language and release activity. A fast-moving project with a compatible licence and an active maintainer base matters more than raw star count when you are committing to a migration.