Grammarly.

Grammarly is an AI writing assistant that checks spelling, grammar, clarity and tone as you type, made for students, professionals and teams who write in English every day. According to Grammarly’s official website, the Free plan costs $0, and Grammarly Pro starts at $12 per member per month billed annually. If your writing has to sound polished everywhere — email, documents, chat, reports — Grammarly is the tool most people reach for first.

What is Grammarly?

Grammarly is a cloud-based writing assistant that reviews your text in real time and suggests corrections and improvements as you write. Instead of a separate editing step at the end, it works where you already write — in the browser, in documents and in everyday apps — so mistakes get fixed before you hit send. Grammarly’s official site says it is trusted by over 40 million people and 50,000 organizations, and the product now sits inside Superhuman, pairing its writing engine with proactive AI agents for larger teams.

The free version focuses on the basics: mistake-free writing and tone awareness. Paid plans add the heavier machinery — full-sentence rewrites, tone adjustment, brand style guides and originality checks. That split makes Grammarly unusual among AI writing assistants: it is genuinely useful at $0, and it scales up into an enterprise product with SAML single sign-on, SCIM provisioning, data loss prevention and BYOK encryption.

Key Features

• Real-time grammar and spelling checks — the Free plan already covers the essentials: write without spelling and grammar mistakes, everywhere you type.
• Tone detection and adjustment — Grammarly shows you the tone your writing gives off on the Free plan, and Pro lets you adjust the tone of your text deliberately.
• Full-sentence rewrites — a Pro feature that rewrites whole sentences with a click when a line is clunky, wordy or unclear.
• Generative AI prompts — generate and rewrite text with AI prompts: 100 per month on Free, 2,000 per member per month on Pro, and unlimited on Enterprise, according to Grammarly’s plans page.
• Plagiarism and AI-text detection — Pro and above can catch accidental plagiarism and detect AI-generated text, useful for students, editors and content teams.
• Style guides and brand tones — teams can load a style guide and brand tone so everyone’s writing stays consistent (1 of each on Pro, unlimited on Enterprise).
• Snippets and analytics — reusable text snippets and team analytics dashboards for larger accounts.
• Enterprise-grade security — SOC 2 (Type 2) controls, with SAML SSO, SCIM, custom roles, audit logs, confidential mode and data loss prevention on Enterprise.

If your problem is not polishing but wording that reads as robotic, a dedicated humanizer works differently — our Clever AI Humanizer review covers a free option built for exactly that. You can also browse every writing tool we track in the AI Writing Assistant category.

How to Use Grammarly

1. Create a free account on grammarly.com — no card is required for the Free plan.
2. Add Grammarly where you write: install the browser extension or app so suggestions appear as you type in email, docs and web forms.
3. Start writing. Underlines flag spelling, grammar and clarity issues in real time; click a suggestion to accept it or dismiss it.
4. Check the tone readout before sending anything important, and adjust the wording if the tone misses the mark.
5. On Pro, use full-sentence rewrites and the generative AI prompts to redraft paragraphs, then run the plagiarism and AI-text checks before you publish or submit.

How much does Grammarly cost?

According to Grammarly’s official plans page, Grammarly Free costs $0, Grammarly Pro costs $12 per member per month billed annually ($30 when billed monthly), and Grammarly Enterprise is custom-priced for larger organizations. Pro also offers a free trial, so you can test the paid features before paying.

Plan	Price	What you get
Free	$0	Write without spelling and grammar mistakes, see your writing tone, generate text with 100 AI prompts per month.
Pro	$12/mo	Everything in Free, plus full-sentence rewrites, tone adjustment, unlimited personalized suggestions, plagiarism and AI-text detection, 2,000 AI prompts per member/month. Price is per member/month billed annually; $30 billed monthly.
Enterprise	Custom	Everything in Pro, plus unlimited AI prompts, proactive AI in every app, dedicated support, BYOK encryption, custom roles, data loss prevention and cost center visibility.

Last verified: October 2026

Pros

• The Free plan is properly useful, not a demo — mistake-free writing, tone readout and 100 AI prompts a month.
• Works where you already write, so there is no copy-paste editing workflow to adopt.
• Pro bundles rewrites, plagiarism checks and AI-text detection that rivals charge for separately.
• Serious enterprise controls (SSO, SCIM, BYOK, DLP) for regulated teams.

Cons

• Monthly billing stings: Pro jumps from $12 to $30 per member per month if you won’t commit annually.
• The strongest features — rewrites, originality checks, unlimited prompts — sit behind paid tiers.
• It polishes and checks writing rather than generating long-form content from scratch like a dedicated AI writer.

Who should use Grammarly?

Grammarly fits anyone whose job runs on written English: professionals sending client email, students submitting assignments, support and sales teams writing at volume, and content teams who need originality checks before publishing. Solo writers on a budget can live on the Free plan for a long time; teams that need consistent brand voice and enterprise controls are the natural Pro and Enterprise audience.

Frequently Asked Questions

Is Grammarly free?

Yes. Grammarly offers a Free plan at $0 that corrects spelling and grammar mistakes, shows your writing tone, and includes 100 generative AI prompts per month. Grammarly Pro, at $12 per member per month billed annually, adds full-sentence rewrites, tone adjustment, plagiarism checks, AI-text detection, and 2,000 AI prompts monthly.

Does Grammarly check for plagiarism and AI-generated text?

Grammarly Pro and Enterprise include tools that detect plagiarism and AI-generated text in your documents. The checker scans your writing for accidental plagiarism and flags passages that appear to be AI-generated, helping students, writers, and teams confirm originality before they submit, publish, or share their work with readers.

How many AI prompts does Grammarly include?

Grammarly includes a monthly allowance of generative AI prompts on every plan. The Free plan includes 100 AI prompts per month, Grammarly Pro includes 2,000 prompts per member per month, and Grammarly Enterprise includes unlimited prompts, letting teams generate, rewrite, and reply to text without watching a usage meter.

Where does Grammarly work?

Grammarly works where you already write. The assistant runs in your browser, email, documents, and everyday apps, offering suggestions as you type rather than forcing you to paste text into a separate editor. Grammarly Enterprise, delivered through Superhuman Go, adds proactive AI that works in every app and tab.

Final Verdict

Grammarly remains the safest recommendation in the AI writing assistant category: a free plan that genuinely improves everyday writing, and a fairly priced Pro tier that adds rewrites, tone control and originality checks. It won’t replace a content-generation tool, but as the layer that makes everything you write cleaner and more credible, very little beats it. See how it compares with the other tools in our AI Writing Assistant category.

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