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Grammarly

A writing assistant that checks grammar, spelling, clarity, and tone across the apps and browsers you already use, with AI generation and rewriting features layered on top.

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What it does

Grammarly is a writing-assistance tool that layers real-time grammar, clarity, and tone checking onto the apps you already use — browser, email, Word, and more. Beyond proofreading, its paid tiers add full-sentence rewrites, plagiarism and AI-detection scanning, and generative AI prompts for drafting or restyling text. It’s less a content-generation platform than a persistent editing layer, making it complementary to, rather than a replacement for, generation-focused tools like Jasper or ChatGPT.

Ideal users

  • Students and professionals who write daily emails and documents and want an always-on proofreading layer
  • Non-native English writers
  • Teams needing consistent tone and style across many writers
  • Anyone who wants suggestions inside existing tools rather than a separate app

Who should avoid it

  • You're a fiction writer needing long-form generative drafting — better served by Sudowrite
  • You need deep go-to-market or marketing workflow automation
  • You need a fully offline or air-gapped tool

Key features

  • Real-time grammar, spelling, and clarity checks
  • Tone detection and full-sentence rewrites
  • Plagiarism and AI-content detection (paid tiers)
  • Browser extension for Chrome, Safari, Firefox, and Edge
  • Desktop app for Word (Windows/Mac); Outlook support on Windows
  • AI prompts for generating and rewriting text
  • Style guides and brand tones (Enterprise)

Pros

  • Works inside apps people already use — Gmail, Word, browser, even ChatGPT
  • Genuinely usable free tier for basic grammar and spelling
  • Generous AI prompt allowance on Pro (2,000/month)
  • Does not sell user content or let third-party LLM vendors train on it
  • Single consolidated Pro plan simplifies buying

Cons

  • Plagiarism and AI-detection accuracy is inconsistent
  • Can be over-aggressive with style suggestions
  • Generative writing quality trails purpose-built AI writers
  • Discontinuing the separate Business plan may complicate procurement for some larger orgs

Pricing

Free — $12/month billed annually (Grammarly Pro); $30/month billed monthly

Premium and Business plans were merged into a single Pro plan supporting up to 149 seats; Enterprise remains custom-quoted.

Typical workflows

  • A student or professional installs the browser extension and desktop app and gets real-time corrections while writing emails, documents, and social posts.
  • Teams standardize tone and terminology across writers using shared style guides on Enterprise.
  • Users generate or rewrite text inline for tone shifts or full-sentence rewrites.

Integrations

  • Chrome, Safari, Firefox, Edge browser extensions
  • Microsoft Word desktop app
  • Outlook (Windows)
  • Gmail and Google Docs via the browser extension

Privacy & security notes

Grammarly states it does not sell user content or allow third-party LLM providers to train on it. Individual and Pro users have an opt-out toggle, on by default, controlling whether Grammarly itself uses their content for its own product-improvement training.

Frequently asked questions

Is Grammarly's free plan good enough?

For basic grammar and spelling and light AI use (100 prompts/month), yes; tone rewrites and plagiarism detection require Pro.

Does Grammarly still have a separate Business plan?

No — Premium and Business were merged into Pro, supporting up to 149 seats.

Does Grammarly train AI on my writing?

It doesn't sell content or let LLM vendors train on it; users can opt out of Grammarly's own product-improvement training.

Can I use it in Word or Outlook?

Yes, via the desktop app on Windows/Mac, with Outlook integration on Windows.

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