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Grammarly

Grammarly

AI writing assistance everywhere.

Free planFrom $12/moWriting & ContentProductivity
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About Grammarly

Grammarly works by sitting inside the tools you already use. Your browser, desktop apps, and mobile keyboard. And running your text through a layer of AI that checks grammar, flags tone mismatches, suggests sentence rewrites, and now routes certain tasks through specialized AI agents. It's not a standalone editor you have to copy-paste into. It's an ambient layer that reads context and fires suggestions in real time, wherever you're writing.

The underlying mechanic has expanded well beyond spell-check. The Pro tier adds full sentence rewrites, tone adjustment, brand style guide enforcement, and 2,000 AI prompt credits per month. The newer agent features. An AI Detector, a Humanizer agent, and Reader Reactions. Suggest Grammarly is building toward a workflow where you can both generate and audit AI-assisted writing in the same interface. That's a meaningful shift from where the product was two years ago.

With 40 million people and 50,000 organizations reportedly using it, Grammarly is the closest thing to a default writing layer for knowledge workers. The free tier is genuinely useful. Mistake-free writing and tone visibility at $0. But the interesting capabilities start at $12/member/month (billed annually) or $30 billed monthly. Enterprise pricing requires a sales call, which is standard but worth noting if you're trying to budget quickly.

Key features

Real-Time Proofreading

Grammarly checks grammar, structure, and clarity inline across your browser, desktop, and mobile. So you're not editing in a separate tool.

Sentence Rewrites

The Pro plan lets you rewrite full sentences with one click, improving flow and conciseness without manually reworking each line.

Tone Suggestions

Grammarly reads the emotional register of your writing and surfaces tone suggestions so your message lands the way you intend. Whether that's confident, formal, or friendly.

Brand Style Guide Enforcement

Teams and enterprise accounts can apply a brand style guide directly inside tools like Zendesk, so every customer-facing message stays on-brand without a manual review step.

AI Detector and Humanizer Agents

Two dedicated agents let you spot AI-generated text in a document and then revise it to read more naturally. Useful if you're editing AI-drafted content before it goes public.

Reader Reactions

This feature lets you preview how your writing might land with a specific audience, surfacing potential misreadings before you hit send.

Best for

  • Marketing and customer support teams enforcing a brand voice at scale
  • Solo professionals who need polished writing without a dedicated editor
  • Students and academics who want grammar and plagiarism checks in one place
  • Product and sales teams writing high-stakes outbound or documentation
  • Organizations auditing AI-generated content before publishing

Skip if

  • Skip this if you need a long-form writing environment. Grammarly is an overlay, not a document editor like Notion or Google Docs.
  • Skip this if you're on a tight budget and need more than 100 AI prompts per month. That limit hits fast on the free tier, and the next step is $12/month per member.
  • Skip this if you need deep code documentation support. Grammarly is built for prose, not technical writing in IDEs.

Pros & cons

Pros

  • The free tier includes real mistake-free writing and tone visibility at $0, which is genuinely more than most competitors offer for free.
  • It works across browser, desktop, and mobile without requiring you to change where you write.
  • Brand style guide enforcement inside tools like Zendesk is a concrete, practical feature for support and marketing teams. Not just a marketing claim.
  • The AI Detector and Humanizer agents address a real workflow gap for teams editing AI-drafted content.
  • Security posture is explicitly called out: Grammarly states it doesn't sell user content or allow third-party providers to train on it.

Cons

  • The free tier caps AI prompt generation at 100 per month, which you'll exhaust quickly if you're using it for anything beyond light editing.
  • Pro is $30/month when billed monthly. That's a meaningful premium over the $12/month annual rate, and there's no middle-ground billing option advertised.
  • Enterprise pricing is contact-sales only, so there's no public per-seat rate to evaluate without getting on a call.
  • The newer agent features (Humanizer, AI Detector, Reader Reactions) are still relatively new and the source text doesn't detail their accuracy benchmarks or model specifics.

Pricing

TierPriceIncludes
Free$0 / monthMistake-free writing, tone visibility, 100 AI prompt credits per month
Pro$12 / member / month (billed annually) or $30 / member / month (billed monthly)Everything in Free, full sentence rewrites, tone adjustment, brand style guide, 2,000 AI prompt credits per month, 7-day free trial
EnterpriseContact SalesEverything in Pro, unlimited members, dedicated support, confidential mode, granular roles and permissions, data loss prevention, unlimited generative AI prompts

Frequently asked questions

What's actually included in the free plan?

The free plan covers mistake-free writing, tone visibility, and 100 AI prompt credits per month at $0. It's enough for light editing but you'll hit the prompt cap fast if you're using generative features regularly.

How much does Grammarly Pro cost?

Pro is $12 per member per month billed annually, or $30 per member per month billed monthly. So committing annually saves you roughly 60%. There's a 7-day free trial available.

Does Grammarly work inside tools like Zendesk or Google Docs?

Yes. Grammarly runs as a browser extension and desktop app, so it works inside Zendesk, Google Docs, and most web-based writing surfaces. Brand style guide enforcement is specifically shown in a Zendesk context in their product demos.

Is my writing data used to train AI models?

Grammarly explicitly states it doesn't sell or monetize user content, doesn't use it for advertising, and doesn't allow third-party service providers to train their models on user content. Which puts it ahead of several competitors on this point.

How does Grammarly compare to just using ChatGPT for writing help?

ChatGPT requires you to copy-paste content into a separate interface and prompt it manually, while Grammarly works inline wherever you're already writing. Grammarly also adds tone detection, brand style enforcement, and an AI Detector agent. Features ChatGPT doesn't offer natively.

How Grammarly compares

Grammarly vs ChatGPT

ChatGPT is more powerful for generating long-form content from scratch, but it doesn't work inline in your existing tools the way Grammarly does, and it has no native tone detection, brand style enforcement, or AI detection features.

Grammarly vs ProWritingAid

ProWritingAid goes deeper on style analysis and is popular with fiction writers, but it lacks Grammarly's cross-platform browser and mobile coverage and doesn't offer brand style guide enforcement for teams.

Grammarly vs Notion AI

Notion AI is tightly integrated into Notion's document editor and great if you live in that tool, but it won't follow you into Gmail, Zendesk, or your browser the way Grammarly does.

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