Why it's a strong pick

Grammarly covers grammar, spelling, punctuation and tone in one extension, and it offers a free plan. Its own pages say it works across many apps and sites, and that it supports languages beyond English. The trade-off: it reads what you type and sends it to Grammarly's servers, and you are asked to sign in. Read the privacy notes below before you use it on sensitive text.

What it does

Grammarly checks your writing as you type and shows suggestions inline. It flags grammar, spelling and punctuation problems, and gives tone and clarity suggestions. It also has AI writing help. Grammarly says on its Chrome page that it works in more than a million apps and programs. That is its claim, and we have not tested it. The company renamed itself Superhuman on 29 October 2025. The Grammarly product kept its name.

Key features

Grammar, spelling and punctuation checks. Suggestions appear as you write.
Tone suggestions. It flags wording that may read as unclear or off-tone.
AI writing help. Part of the product, with limits that depend on your plan.
English dialects. American, British, Canadian, Australian and Indian English, per Grammarly's help center.
Other languages. Grammarly's own languages page says it also gives suggestions in languages besides English. See that page for the current list.
Free and Pro plans. The free plan covers the basics. Pro adds more, such as full-sentence rewrites. See grammarly.com/plans for current terms.

Who it's for

Grammarly suits people who write in many places and want one checker with a free way to start. If you need detailed reports for long drafts, look at ProWritingAid. If you write in several languages, compare LanguageTool, which now needs a paid plan for its extension. If you want an offline option, try Harper. Our Grammarly alternatives page lays out the choices.

Does Grammarly only work in English?

No. Grammarly's help center says it also gives suggestions in languages other than English, in all plans. It also supports several English dialects: American, British, Canadian, Australian and Indian. We do not list the other languages here, because the list can change. Check Grammarly's languages page for the current one.

Where does the text I type go?

Your text goes to Grammarly's servers, because that is how the checker works. Grammarly says it cannot access anything you type unless you are actively using a Grammarly product, and that it does not record every keystroke. Those are Grammarly's statements. Read its privacy policy before you paste anything sensitive.

Grammarly also says it ignores sensitive fields such as passwords and payment details on a best-efforts basis, stores data on AWS servers in US data centres, and does not and will not sell your data.

What permissions does Grammarly ask for?

Grammarly's help center says the extension needs access to your text on the sites where you use it, and that you can turn it off per site. We did not read the full permission list from the vendor. Check the install prompt in Chrome for the current permissions before you add it.

Do I need an account?

You are asked to sign in. Grammarly's help center treats signing in as the normal way to get started with the extension. We found no line that says an account is optional, so plan to sign in. Check the extension's page before you install it.

FAQ

Is Grammarly free? There is a free plan and a paid Pro plan. Plan limits and prices change, so check grammarly.com/plans.

Can I switch it off on one site? Yes. Grammarly's help center describes per-site controls. Use them for work email or private documents.

Is Grammarly the same as Superhuman? Grammarly the company renamed itself Superhuman in October 2025. The Grammarly product keeps its name.

Good to know

Turn Grammarly off on sites where you handle private text, such as work email, legal drafts or medical notes. The per-site switch is in its settings. Also remember that the free plan has limits on AI features, so check what your plan includes before you depend on it.

Other grammar checkers to compare

Grammarly is one of 8 picks in our Grammar Checkers guide, which compares them side by side and explains how to choose. The other picks:

LanguageTool: A grammar and style checker for 25+ languages. The browser extension needs a paid Premium plan.
QuillBot: A grammar checker and paraphraser in one extension. Free plan, paid Premium. Read the privacy settings first.
ProWritingAid: A grammar and style checker with 25+ writing reports for self-editing. Free plan, paid plans.
Wordtune: A rewrite-first writing tool from AI21 Labs. Free Basic plan with daily limits, paid plans above it.
Sapling: Grammar, rephrasing and autocomplete aimed at work messages. Free plan, paid Pro and team plans.
Ginger: Checks spelling and grammar as you type. A free plan with limits, and a paid Premium plan.
Harper: A free, open-source grammar checker that does its work offline in your browser.

See alternatives: Grammarly alternatives

Also see: Best Chrome extensions for students