Can I open-source Grammarly?
YES · mature open-source replacementYes. Ollama (178k stars), Lobe Chat (65k stars), LibreChat (28k stars) are mature open-source replacements for Grammarly — self-host in one command and stop paying $30/mo.
They pay because suggestions appear inside the apps where writing actually happens.
xinline suggestions everywhere
xdocument/email integrations
xtone/brand controls
xenterprise admin
xpolished false-positive handling
These projects already replace it, free.
HHarperA fast English grammar checker that stays on your device and mostly keeps its opinions to itself.open source↗LLanguageToolGrammar, style and spell checker for 30+ languages; run the server locally and keep your prose private.open source↗WWriting ToolsSelect text anywhere, hit a hotkey, and fix, rewrite, summarize, or obey a custom instruction without opening another tab.open source↗What each one is, in full: LanguageTool
all 7 open-source alternatives to Grammarly →· no votes, no pay-to-list · just what's real
Grammarly pricing
| plan | monthly | annual (per mo) | what you get |
|---|---|---|---|
| free | $0/user | $0/user | 100 generative-AI prompts/month. |
| pro | $30/user | $12/user | 2,000 AI prompts/member/month; up to 149 seats; 1 style guide; 1 brand tone; 2 groups. |
| enterprise | custom | — | Unlimited prompts, members, style guides, brand tones, and groups. |
free tier100 generative-AI prompts/month
billingmonthly + quarterly + annual for Pro; Enterprise is custom
hidden costsAdditional Pro seats are prorated. A 7-day trial is available only for eligible accounts.
verified 2026-08-12 · source ↗
Can I open-source Grammarly?
Yes. Harper replaces Grammarly today — self-host it on your own server or machine with no subscription. The full list of open-source alternatives is on this page.
How much does Grammarly cost?
Grammarly costs about $30/month (Pro, checked 2026-07-30), which is $360 per year. That's what you save by replacing it with open source.
What do I lose by replacing Grammarly?
Honestly: inline suggestions everywhere; document/email integrations; tone/brand controls; enterprise admin; polished false-positive handling. If any of those are load-bearing for you, keep paying.
Is there an open-source alternative to Grammarly?
Yes: Harper (A fast English grammar checker that stays on your device and mostly keeps its opinions to itself.) LanguageTool (Grammar, style and spell checker for 30+ languages; run the server locally and keep your prose private.) Writing Tools (Select text anywhere, hit a hotkey, and fix, rewrite, summarize, or obey a custom instruction without opening another tab.) All 7 curated open-source alternatives are at caniopensourceit.online/grammarly/alternatives.