Grammarly used to fix your commas. Now it rewrites your paragraphs, adjusts your tone to match the recipient, and offers to draft full emails from scratch. That’s a significant evolution and one worth examining critically, because the marketing around AI writing tools tends to be significantly more optimistic than the actual experience.

I’ve used Grammarly since the early days. More recently, I spent two months specifically testing the AI generative features that were added (and improved) throughout 2025. Here’s what I found.

What’s Actually New in Grammarly AI

Diagram showing What's Actually New in Grammarly AI

If you haven’t used Grammarly in the past year, here’s what’s changed beyond the classic grammar and spell check:

Rewrite entire paragraphs. Highlight text, ask Grammarly to rewrite for clarity, conciseness, or a different tone. The rewrites are often genuinely better than the original.

Tone detection and adjustment. Grammarly analyzes your text’s current tone (confident, formal, friendly, etc.) and lets you adjust it. This is particularly useful for emails where tone matters more than content.

Generative drafting. Type a brief description and Grammarly will draft an email, message, or document section. This is available in the Grammarly keyboard on mobile and in the browser extension.

GrammarlyGO. The AI assistant layer that responds to prompts within your document improve this, make it shorter, make it more formal, explain this differently.

All of this is accessible through the same browser extension and apps you may already be using.

Pricing Reality Check

Diagram showing Pricing Reality Check

PlanPriceWhat AI Features You Get
Free$0Grammar, spelling, basic suggestions no AI generation
Premium~$12/mo (annual)Full GrammarlyGO, rewrites, tone adjustment, generative drafting
Business~$15/mo per memberEverything in Premium + team analytics, style guides, brand tone
EnterpriseCustomSSO, security controls, admin features

The important thing to know: the AI generative features are Premium or above. If you’re on free and wondering why you’re not seeing the AI writing features, that’s why.

Word count limits on GrammarlyGO apply at some tiers relevant if you’re generating long content regularly.

What Grammarly AI Does Well

Email Polish and Tone

This is Grammarly’s strongest AI use case. You write a rough draft email and Grammarly flags not just grammar issues but tone mismatches sentences that come across more sharply than intended, or overly formal phrasing in what should be a casual exchange.

The tone adjustment feature is practical. Click “Make more direct” or “Make more friendly” on specific passages and the rewrite is usually accurate. I tested this on about 30 real emails and found maybe 70% of the rewrites useful without further editing.

For non-native English speakers specifically, this feature is enormously valuable. Getting tone right in a second language is significantly harder than getting grammar right, and Grammarly’s tone awareness catches things that pure grammar checking misses.

Quick Rewrites for Clarity

Paste in a convoluted paragraph the kind you write when you know what you mean but can’t quite express it and ask Grammarly to rewrite for clarity. The outputs are usually tighter and more readable.

I use this for any paragraph I’ve reread three times and still find clunky. It saves the “I know this isn’t right but I can’t figure out why” time.

Browser Integration The Real Advantage

What makes Grammarly different from using Claude or ChatGPT for writing help: it lives in your browser and works everywhere. It’s running while you type an email in Gmail, comment on a document in Google Docs, write a response in LinkedIn, or draft a post in your CMS.

That ambient, always-on presence is genuinely valuable. I don’t have to copy text into a separate tool, run a prompt, and paste back. The suggestions appear inline as I write.

Where Grammarly AI Falls Short

Long-Form Generation

Asking Grammarly to generate a full blog post or a detailed report from scratch produces mediocre results. The output is grammatically correct and structurally sound but flat, generic, and lacking the depth and voice that Claude or ChatGPT produce for the same task.

Grammarly is built for editing and enhancement, not for substantial content generation. Trying to use it as a primary writing generator means fighting against what it’s designed for.

Can Be Overaggressive

Grammarly’s suggestions are prolific. On some drafts, every other sentence gets flagged. Not all the suggestions improve the text some flatten style or remove intentional choices. The interface requires you to actively dismiss suggestions you disagree with, which becomes fatiguing on longer documents.

In my experience, about 60% of Grammarly’s suggestions improve the text. The other 40% are either neutral or actively worse. Developing a feel for which suggestions to accept takes time.

Style Fighting

If you have a deliberate writing style short fragments for emphasis, conversational asides, unconventional structure Grammarly will frequently flag these as issues. It’s calibrated toward standard, conventionally “correct” writing, which isn’t always the goal.

You can tell it to stop flagging certain things, but it requires configuration per-document.

Grammarly AI vs. ChatGPT for Writing Work

This is the question most people considering Grammarly Premium are actually asking.

TaskGrammarlyChatGPT/Claude
Grammar and spell checkYes SuperiorLimited (copy-paste needed)
Tone adjustment on existing textYes Better (inline, seamless)Limited (capable but more friction)
Email polishingYesYes Both good
Long-form content generationNoYes Significantly better
Always-on in-browser assistanceYesNo
Citation and fact awarenessNoLimited Mixed
Cost$12/mo$20/mo

The right mental model: Grammarly is a writing refiner; ChatGPT/Claude are writing generators. If your work involves significant writing that you need help making better, Grammarly is valuable. If you primarily need to generate first drafts from scratch, a dedicated AI model does it better.

Many people I know use both: Claude or ChatGPT to draft, Grammarly to polish. The combination is genuinely effective.

Who Should Use Grammarly in 2026?

Strong Yes:

  • Non-native English speakers who want real-time tone and grammar support
  • Professionals who write high-stakes emails daily (sales, client management, legal)
  • Teams that want consistent brand tone across communications (Business plan)
  • Anyone who wants ambient writing assistance without switching tools

Probably Not:

  • Writers who prioritize voice and style over convention (it’ll frustrate you)
  • People whose primary AI need is generating long-form content from scratch
  • Budget-conscious users who already have ChatGPT Plus or Claude (significant overlap)
  • Developers who don’t write much prose in their workflow

Common Mistakes With Grammarly AI

Accepting all suggestions by default. Grammarly is a tool, not an authority. Read each suggestion, decide consciously, and override when your original was better.

Using it for content generation. It’s designed for enhancement, not creation. Using it to generate a 1,500-word article from scratch will disappoint you.

Ignoring the tone detection. The tone analysis sidebar is underused. It’s genuinely useful for communication-heavy roles check it before sending anything important.

Key Takeaways

Grammarly AI has evolved meaningfully and is worth reconsidering if you last tried it a few years ago. It’s still not a general-purpose AI tool, but for what it does real-time writing enhancement in your browser nothing else does it as seamlessly.

  • Best use cases: Email tone, real-time grammar, paragraph rewrites, non-native English
  • Skip if: Primary need is long-form content generation
  • Pairs well with: Claude or ChatGPT (generate) + Grammarly (refine)
  • Free tier: Useful for grammar; Premium required for AI features
  • Verdict: Worth $12/month for writing-heavy professionals; optional for everyone else

What’s Next

External Resources