Grammarly: Features, Pricing, Models & Alternatives (2026)

Last researched: September 26, 2026. Grammarly's plan structure and prompt limits have changed more than once in recent years, so verify current figures at grammarly.com/plans before subscribing. Grammarly is a writing assistant made by Grammarly Inc. — now part of the same corporate family as Superhuman following a 2025 restructuring — that checks grammar, spelling, clarity, and tone across browsers, desktop apps, and documents, and has since added generative AI features (drafting, full-sentence rewrites, and an AI chat assistant) on top of its original correction engine.

What Is Grammarly?

Grammarly started as a grammar- and spell-checking browser extension and has evolved into a broader "writing assistant" that works almost anywhere text is typed — browsers, Microsoft Word and Outlook, Google Docs, Slack, and its own desktop apps. Its core product still centers on real-time correction and style suggestions, but its generative AI layer (originally branded GrammarlyGO, now referred to simply as Generative AI) adds the ability to draft new text from a prompt, rewrite full sentences or paragraphs, adjust tone, and detect whether a passage of text was likely AI-generated.

Key Capabilities

• Real-time grammar, spelling, punctuation, and clarity correction as you type
• Tone detection and tone-adjustment suggestions
• Full-sentence and paragraph AI rewrites, not just single-word corrections
• Generative drafting: produce new text from a short prompt inside the same interface
• AI-generated text detection ("AI Detector") for checking whether content was likely written by ChatGPT, Claude, Gemini, or similar tools
• Plagiarism checking (Pro and above)
• Team style guides and brand tone enforcement (Business/Enterprise)

Main Features

Use Cases

• Catching grammar, spelling, and clarity issues in emails, documents, and messages in real time
• Rewriting or drafting short passages of professional or academic writing from a prompt
• Checking whether submitted text may have been AI-generated (educators, editors, hiring teams)
• Enforcing a consistent brand tone and style across a company's written communication (Business/Enterprise)
• Catching potential plagiarism before publishing content

Supported Models / Technologies

Grammarly's own educational blog content describes its built-in "AI Chat" feature as a "built-in GPT-based GenAI chatbot," implying use of OpenAI's underlying technology for that specific feature, while its rewriting, paraphrasing, and "Humanizer" agents are described as running on Grammarly's own proprietary models. Grammarly does not publish a single comprehensive model card covering every feature, so exact model versions and which features route to which provider could not be fully verified as of this writing; the AI Detector separately is designed to recognize output patterns from major third-party models (GPT, Claude, Gemini) rather than being built on them.

Platforms

• Web (browser extension: Chrome, Edge, Firefox, Safari)
• Windows desktop app
• macOS desktop app
• iOS app (including keyboard integration)
• Android app (including keyboard integration)
• Microsoft Word and Outlook add-in
• Google Docs integration

Integrations

Grammarly integrates with Microsoft Word, Outlook, and Google Docs directly, plus works inline across most websites and web apps via its browser extension (Gmail, Slack, LinkedIn, Google Docs, and general text fields). Enterprise plans add data loss prevention and BYOK encryption options aimed at broader corporate security stacks.

Pricing

Advantages

• Works across nearly every place people write (browser, Office, Google Docs, mobile keyboards) rather than one app

• Combines traditional grammar/style checking with generative drafting and rewriting in one tool

• Long operating history (since 2009) and multiple third-party security certifications (SOC 2 Type II, ISO 27001/27701, ISO/IEC 42001)

• Users can opt out of having their content used for model training

Limitations

• Free plan's 100 monthly AI prompts is a hard cap that heavy users will hit quickly
• Exact model architecture behind every individual feature is not fully documented in one place
• Business tier pricing was absorbed into Pro during a 2024 restructuring, so team-specific admin features now sit mainly at Enterprise, which requires a sales conversation
• Some features (proactive AI, DLP, BYOK) are Enterprise-only and unavailable to smaller teams

Security & Privacy

Grammarly documents SOC 2 Type II, ISO 27001, ISO 27701, and ISO/IEC 42001 (responsible AI) certifications, and states compliance with HIPAA, GDPR, and CCPA on its trust center. Users can disable the use of their content for "Product Improvement and Training" in account settings. For binding contractual terms on data handling for a specific plan or industry (e.g., healthcare, education), consult Grammarly's own privacy and security documentation and current Enterprise agreements directly.

Best For

Individuals and teams who need continuous grammar/style correction embedded into their everyday writing tools (email, docs, browser) and want generative drafting/rewriting layered on top of that, rather than a dedicated long-form content-generation platform.

Alternatives

• ProWritingAid — style- and grammar-checking tool with deeper editing/report features for long-form writers
• Microsoft Editor — grammar and style checking built into Microsoft 365
• Google Docs' built-in grammar suggestions — basic free alternative inside Google Workspace
• QuillBot — AI paraphrasing and grammar-checking tool with a strong focus on rewriting
• Wordtune — AI rewriting and tone-adjustment tool for shorter passages

Frequently Asked Questions

How many AI prompts does the Free plan include?

The Free plan includes 100 AI prompts per month, covering generative features like drafting and rewriting; the Pro plan raises this to 2,000 prompts per member per month, and Enterprise removes the cap entirely.

How much does Grammarly Pro cost?

Grammarly Pro is $12/month billed annually (about $144/year), $20/month billed quarterly, or $30/month billed monthly, depending on the billing cycle chosen.

Does Grammarly use GPT, Claude, or its own AI models?

According to Grammarly's own educational content, its built-in AI Chat feature is described as a GPT-based generative chatbot, while its rewriting/paraphrasing/humanizer agents run on Grammarly's own proprietary models. Grammarly does not publish a single definitive model architecture for every feature, so some details should be confirmed directly with Grammarly for enterprise due diligence.

Is Grammarly compliant with enterprise security standards?

Yes. Grammarly holds SOC 2 Type II, ISO 27001, ISO 27701, and ISO/IEC 42001 certifications and states compliance with HIPAA, GDPR, and CCPA, primarily documented for its Business/Enterprise tiers.

Can I stop Grammarly from using my writing to train its models?

Yes. Users can opt out of allowing Grammarly to use their content for product improvement and model training via the "Product Improvement and Training" setting in their account.

Final Summary

Grammarly remains primarily a real-time grammar and style checker embedded across browsers, Office, and mobile keyboards, now layered with generative drafting, full-sentence rewrites, and AI-text detection. As of September 2026 its Free plan caps generative use at 100 prompts/month, Pro costs $12–$30/month depending on billing cycle with 2,000 prompts/month, and Enterprise removes the cap alongside added compliance and data-control features — figures worth reconfirming on Grammarly's own plans page given the company's recent restructuring.