AI Tools
Grammarly is an AI writing assistant that checks and corrects grammar, tone, and plagiarism, rewrites sentences, and generates text from AI prompts across browsers, desktop, and mobile apps. Verified pricing (June 2026): Free at $0 per month (mistake-free writing, tone detection, 100 AI prompts per month); Pro at $12 USD per month with a 7-day free trial (annual Pro listed at $144 per year); Enterprise via contact sales. On Pro, AI prompts rise to 2,000 per member per month, and full-sentence rewrites, plagiarism detection, and AI-generated-text detection unlock.
The product's reach is its moat: it works inside Chrome, Safari, Firefox, and Edge plus iPhone, iPad, and Android apps, so it polishes writing wherever it happens, from email to docs to Slack. It corrects over 400 types of grammatical errors in typed or uploaded text, adjusts tone, and rewrites sentences with a click. This is a writing-polish layer, not a content generator.
Grammarly's nearest category neighbors are generation platforms rather than editors. Jasper, verified at $59 per seat per month billed yearly or $69 monthly, generates marketing content with brand governance; Copy.ai, verified at $29 per month monthly or $24 annual, automates GTM workflows. Both cost several times Grammarly Pro's $12 per month but produce content from scratch, which Grammarly does not. The closest dedicated grammar competitor, ProWritingAid, returned a 405 to automated verification in August 2026, so its current pricing is not verified here.
Grammarly
Grammarly is an AI writing assistant that checks and corrects grammar, tone, and plagiarism, rewrites sentences, and generates text via AI prompts across browsers, desktop, and mobile apps. Best for: Everyday grammar correction and AI-assisted editing across browsers and apps.
At a glance
| Category | AI Tools |
| Starts at | $0/mo (Free plan); Pro $12 USD/mo |
| Pricing | Free plan at $0/month (mistake-free writing, tone detection, 100 AI prompts/month); Pro at $12 USD/month with a 7-day free trial (annual Pro plan listed at $144/year); Enterprise via contact sales. |
| Best for | Everyday grammar correction and AI-assisted editing across browsers and apps |
Key features
- Finds and corrects over 400 types of grammatical errors in typed or uploaded text
- Full-sentence rewrites with a click and writing tone adjustment (Pro)
- Plagiarism and AI-generated text detection (Pro)
- Generative AI text prompts: 100/month on Free, 2,000/member/month on Pro, unlimited on Enterprise
- Works in Chrome, Safari, Firefox, and Edge browsers plus iPhone, iPad, and Android apps
How does Grammarly compare to Jasper and Copy.ai?
Jasper, verified on its pricing page in August 2026, costs $59 per seat per month billed yearly or $69 billed monthly. It generates on-brand marketing content with Jasper IQ brand governance and Content Pipelines. Grammarly Pro at $12 per month does not generate long-form content; it corrects, rewrites, and polishes text inside the apps you already use.
Copy.ai, verified at $29 per month monthly or $24 per month billed annually ($288 per year) on the Chat plan, automates GTM workflows: prospecting, CRM enrichment, and AI agents. Grammarly does not automate workflows or generate campaigns; its job is the final layer of correctness and tone across every sentence a team writes.
The honest framing: Jasper and Copy.ai are content and automation platforms with prices 2 to 5 times Grammarly Pro, while Grammarly is the cheapest option here at $12 per month and the only one that works across browsers and mobile as a persistent editing layer. ProWritingAid, the closest grammar-focused alternative, could not be price-verified this run (405 on automated check). Buy Grammarly for polish, the others for generation.
Who should use Grammarly?
If you are an individual writer, student, or professional who communicates in email and documents all day, Grammarly is a fit because the Free plan already covers mistake-free writing and tone detection, and Pro at $12 per month adds rewrites, plagiarism checks, and 2,000 AI prompts per month for $0.99-per-day-class pricing.
Teams that need style consistency and originality checks fit Pro as well: it runs across browsers and mobile apps, catches AI-generated text and plagiarism, and scales prompts to 2,000 per member per month, with Enterprise tiers available via sales for org-wide controls.
Grammarly is NOT ideal for teams whose actual need is content generation at scale: Jasper at $59 to $69 per seat or Copy.ai at $24 to $29 per month produce campaigns and automate GTM work, which Grammarly does not. It is a polish layer, and buyers should not expect it to draft long-form marketing assets.
Pricing
Free plan at $0/month (mistake-free writing, tone detection, 100 AI prompts/month); Pro at $12 USD/month with a 7-day free trial (annual Pro plan listed at $144/year); Enterprise via contact sales. Confirm current terms on the vendor site before buying.
Alternatives
FAQ
How much does Grammarly cost?
Verified pricing: Free plan at $0 per month (100 AI prompts per month, tone detection); Pro at $12 USD per month with a 7-day free trial, with the annual Pro plan listed at $144 per year; Enterprise via contact sales.
Is Grammarly free?
Yes. Grammarly has a Free plan at $0 per month covering mistake-free writing, tone detection, and 100 AI prompts per month, per the verified pricing page.
Grammarly vs ProWritingAid: which is better?
Grammarly Pro is verified at $12 per month with a 7-day free trial. ProWritingAid's pricing page returned a 405 to automated verification in August 2026, so its current price is not verified here; compare feature sets on both official sites before choosing.
Does Grammarly detect plagiarism?
Yes. Plagiarism detection and AI-generated-text detection are listed Pro features, alongside full-sentence rewrites and tone adjustment.