Grammarly

Grammarly is the everyday writing assistant that follows you across the browser, desktop apps, mobile and documents: it flags grammar, spelling and punctuation in real time, detects the tone of a message before you send it, and — through its AI assistant — rewrites sentences, adjusts formality and generates drafts on demand. Since acquiring the email client Superhuman in 2025, Grammarly has folded its old Premium and Business plans into a simpler line-up.

Key facts: The free plan is unusually usable: full real-time grammar and spelling checks, tone detection and 100 AI prompts a month, with no card required. Pro adds full-sentence rewrites, clarity and tone adjustments, plagiarism detection and 2,000 AI prompts a month, plus team features for up to 149 seats. A separate Business bundle pairs Grammarly Pro with the Superhuman email suite for teams that want both.

Plans: Free costs $0. Pro is $12/month billed annually ($144/year), or $30/month billed month-to-month, with a quarterly option in between; Enterprise is custom priced for organisations of 150+ needing admin controls and security governance. Watch the billing gap: the monthly rate is far above the annual equivalent, and the annual charge is taken upfront, so set a renewal reminder if you trial Pro.

Best for: professionals, students and anyone who writes dozens of short messages, emails and documents a day and wants them clean and diplomatic without thinking about it. Fiction writers and manuscript editors may prefer a long-form specialist, but for everyday writing Grammarly's free tier is the right starting point. Who should skip it: fiction writers and manuscript editors, who may prefer a long-form specialist for book-length work.

Pros

• Follows you across the browser, desktop apps, mobile and documents, checking writing wherever you type.
• Flags grammar, spelling and punctuation in real time and detects tone before you send a message.
• Its AI assistant rewrites sentences, adjusts formality and generates drafts on demand.
• The free plan is unusually usable: full real-time grammar and spelling checks, tone detection and 100 AI prompts a month, with no card required.

Watch out for

• The monthly rate is far above the annual equivalent: Pro is $30 a month billed month-to-month versus $12 a month billed annually, and the annual charge is taken upfront.
• Fiction writers and manuscript editors may prefer a long-form specialist over an everyday writing assistant.
• Pro's 2,000 AI prompts a month is a cap, so very heavy AI drafting can still run out.

Pricing

Free costs $0, with full real-time grammar and spelling checks, tone detection and 100 AI prompts a month. Pro is $12 a month billed annually ($144 a year), or $30 a month billed month-to-month, with a quarterly option in between, adding full-sentence rewrites, clarity and tone adjustments, plagiarism detection, 2,000 AI prompts a month and team features for up to 149 seats. Enterprise is custom priced for organisations of 150 or more. A separate Business bundle pairs Grammarly Pro with the Superhuman email suite.

FAQs

Is Grammarly free? Yes, the free plan costs $0 and includes full real-time grammar and spelling checks, tone detection and 100 AI prompts a month, with no card required.

What does Pro add? Full-sentence rewrites, clarity and tone adjustments, plagiarism detection and 2,000 AI prompts a month, plus team features for up to 149 seats.

Where does Grammarly work? Across the browser, desktop apps, mobile and documents, so it checks writing wherever you type.

Why is the monthly price so much higher than the annual price? Pro is $30 a month billed month-to-month versus $12 a month billed annually, and the annual charge is taken upfront, so set a renewal reminder if you trial Pro.