Grammarly has been the default grammar checker for so long that it's easy to overlook how much the product has changed. In 2026, it operates under the Superhuman Platform umbrella, has renamed Premium to Pro, and dropped its standalone Business tier in favor of a custom Enterprise plan.
What is Grammarly?
Grammarly is an AI-powered writing assistant that checks grammar, spelling, punctuation, and tone in real time, while also offering AI-generated rewrites for clarity, formality, and length. It works through browser extensions, a desktop app, a mobile keyboard, and direct integrations with tools like Google Docs and Microsoft Word.
The core product hasn't changed much in spirit: catch mistakes as you type, and suggest better phrasing when something reads unclearly. What's shifted is the packaging, with generative AI rewrites, plagiarism detection, and tone transformations now bundled together under the Pro plan rather than split across multiple paid tiers.
Key features
Grammar and Spelling Checker
Detects grammar, spelling, punctuation, and sentence-structure issues in real time, with suggestions users can accept or dismiss individually.
AI-Generated Rewrites
Produces alternative versions of a sentence or full message, adjusted for tone, length, formality, or clarity, in a couple of taps.
Tone Detection and Transformation
Analyzes how a message is likely to sound to the reader and can rewrite it toward a different tone, such as more formal, friendly, or confident.
Plagiarism and AI Text Detection
Checks documents against a large content database and flags AI-generated text, useful for academic and professional writing standards.
Voice Dictation
Converts spoken input into cleaned-up, grammatically correct text, automatically removing filler words while preserving intended tone.
Browser and App Integrations
Works directly inside Gmail, Google Docs, Microsoft Word, Outlook, and major browsers, so suggestions appear without switching to a separate tool.
Pros
- Works across a genuinely broad range of browsers, apps, and operating systems
- Real-time corrections are easy to understand and apply without disrupting writing flow
- Free plan remains useful for basic grammar, spelling, and limited AI prompts
- Tone detection helps with professional and customer-facing communication specifically
- Plagiarism and AI detection add real value for academic and content-integrity use cases
Cons
- Standalone Business plan was discontinued, teams now need a custom Enterprise quote instead
- Monthly billing costs two and a half times more than the annual rate, a steep penalty for flexibility
- The Grammarly Keyboard for Android has an announced discontinuation, worth checking current mobile support before relying on it
- No public API for developers wanting to integrate Grammarly's engine into other products
Pricing
Grammarly's Free plan includes core grammar, spelling, and punctuation checking along with roughly 100 AI prompts per month, no credit card required. Pro costs $12/month when billed annually ($144/year) or $30/month billed monthly, and bundles what used to be split across Premium and Business: AI rewrites, plagiarism and AI detection, tone suggestions, and around 2,000 AI prompts monthly.
The separate Business plan for teams has been discontinued; organizations now need a custom Enterprise quote, which includes centralized billing, advanced admin controls, and a dedicated account manager. Confirm current plan details directly on Grammarly's pricing page, since the shift from Premium/Business naming to Pro/Enterprise is relatively recent.
Best for
Grammarly is best suited to anyone who writes regularly and wants real-time feedback without repeatedly copying content into a separate editing tool. It's a natural fit alongside broader AI Writing tools for students, professionals, marketers, and business teams producing written content daily.
Use cases
- Catching grammar, spelling, and punctuation errors while writing
- Rewriting emails and messages for clarity or a different tone
- Checking documents for plagiarism or AI-generated content
- Drafting and refining professional communication
- Using voice dictation for hands-free writing and cleanup
- Writing consistently across multiple languages
Supported platforms
- Web, Windows, macOS, Android, iOS, and browser extensions for Chrome, Edge, Firefox, and Safari.
Languages
- Grammarly supports English, Spanish, French, German, Portuguese, Italian, and multilingual AI rewrites, with the deepest feature support in English.
Integrations
- Google Docs, Gmail, Microsoft Word, Microsoft Outlook, and browser extensions for Chrome, Edge, Firefox, and Safari.
Things to consider
- The move from Premium/Business naming to Pro/Enterprise means older reviews and comparisons may reference plans that no longer exist in their original form, worth double-checking current tier names before assuming pricing hasn't changed. Mobile users specifically should also confirm the current status of the Android keyboard, since Grammarly has announced its discontinuation even as the core Android app continues.
- There's no public API, so teams looking to build Grammarly's grammar-checking engine into their own internal tools will need to look elsewhere or work through Grammarly's browser and app integrations instead.
How the tool compares
Compared with general-purpose assistants like ChatGPT or Claude AI, Grammarly focuses specifically on real-time grammar and tone checking embedded directly into existing writing surfaces, rather than requiring a separate chat interface for every edit. Compared with other dedicated grammar checkers like ProWritingAid or LanguageTool, Grammarly's browser and app integration coverage remains one of its stronger practical advantages.
AIToolister verdict
Grammarly remains a practical choice for anyone who wants grammar correction, tone feedback, and AI rewriting built directly into the tools they already write in. The free plan covers basic needs well, while Pro at $12/month annually is reasonably priced for what it bundles, now that Premium and Business features have consolidated into one tier.
Teams evaluating Grammarly for organization-wide rollout should budget for a custom Enterprise conversation, since the previous fixed-price Business plan is no longer available.
Frequently asked questions
- Is Grammarly free to use?
Yes. Grammarly's Free plan includes core grammar, spelling, and punctuation checking along with roughly 100 AI prompts per month, with no credit card required.
- What happened to Grammarly Premium and Business?
Grammarly renamed Premium to Pro, consolidating features from both Premium and the former Business plan into one tier. The standalone Business plan for teams was discontinued and replaced with a custom-priced Enterprise plan.
- Does Grammarly have an Android app?
Yes, though the Grammarly Keyboard specifically for Android has an announced discontinuation. It's worth confirming current mobile feature support directly with Grammarly before relying on keyboard-level integration.
- Can Grammarly detect AI-generated text?
Yes. Grammarly's Pro plan includes plagiarism and AI text detection, checking documents against a large content database and flagging content that appears AI-generated.
- Does Grammarly replace a human editor?
No. Grammarly can identify problems and suggest improvements, but important academic, legal, technical, or professional documents may still require human review.