Stay free if you only need grammar, spelling, and punctuation checks and basic tone detection. Upgrade if you need everything in pro and advanced security and compliance features. Most solo builders can start free.
Why it matters: Pro and Enterprise pricing is higher than competitors like ProWritingAid or LanguageTool, with Pro at $12/month annual ($30 monthly) compared to ProWritingAid's $10/month lifetime option
Available from: Pro
Why it matters: Suggestions can be overly aggressive or stylistically opinionated, sometimes flagging intentional creative choices or industry-specific terminology as errors requiring manual dismissal
Available from: Pro
Why it matters: Limited support for languages other than English — users writing in Spanish, French, German, or other languages get minimal grammar checking compared to dedicated multilingual tools like LanguageTool
Available from: Pro
Why it matters: Plagiarism checker, while convenient, is less comprehensive than dedicated academic tools like Turnitin and may miss paraphrased content or sources behind paywalls
Available from: Pro
Why it matters: Browser extension can occasionally conflict with rich text editors, cause lag in document-heavy applications like Notion or Confluence, or interfere with custom text formatting in web apps
Available from: Pro
Why it matters: Match your brand and customize the experience. Professional appearance matters.
Available from: Pro
For frequent writers — professionals, students, and content creators — most find the Pro plan pays for itself through time saved on editing and improved writing quality. The plan includes advanced style suggestions, plagiarism detection against 16 billion+ pages, GrammarlyGO with 1,000 AI prompts monthly, and brand voice tools. Casual writers who only need basic grammar checking will find the free tier sufficient.
In late 2025, Grammarly renamed Premium to 'Pro' and discontinued the separate Business tier. Team and organizational features were consolidated under the Enterprise plan with custom pricing. Existing Premium subscribers were automatically migrated to Pro with no change in features or pricing.
Grammarly excels in real-time ease of use, integration breadth (500,000+ apps), and generative AI capabilities. ProWritingAid offers better value for long-form writers with deeper style reports and a lifetime pricing option. LanguageTool supports 30+ languages versus Grammarly's English-only focus, making it better for multilingual users. Grammarly has the most polished user experience and broadest platform support.
Grammarly holds SOC 2 Type II, ISO 27001, ISO 27017, ISO 27018, ISO 27701, and ISO 42001 certifications. They do not sell or monetize user content — revenue comes exclusively from subscriptions. Enterprise plans add SAML SSO, custom security keys, and configurable data retention policies. All data is encrypted in transit and at rest.
No. Grammarly requires an active internet connection for all functionality, including basic grammar checking. The AI processing happens on Grammarly's cloud servers, so there is no offline mode. Users in environments with unreliable internet should consider tools with offline capabilities like the desktop versions of ProWritingAid or Microsoft Editor.
Yes, the Pro and Enterprise plans include plagiarism detection that checks your text against 16 billion+ web pages and academic databases. It identifies matching passages and provides source links. However, it is not as comprehensive as dedicated academic integrity tools like Turnitin, particularly for paraphrased content or sources behind paywalls.
Start with the free plan — upgrade when you need more.
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Last verified March 2026