Stay free if you only need basic features. Upgrade if you need advanced features. Most solo builders can start free.
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.
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Last verified March 2026