Grammarly

AI writing assistant that checks grammar, tone, and clarity everywhere you type.

Free plan availableProductivityReviewed by Kelen · last checked September 12, 2026

About Grammarly

Grammarly is the AI writing assistant that checks grammar, spelling, clarity, tone, and style everywhere you type — email, docs, messages, social posts, and the web. It has been the standard for writing improvement for over a decade.

Its generative AI can draft, rewrite, and adjust tone, turning a terse email into a polished message or a casual note into a professional one. The browser extension works across virtually every site.

For anyone who writes in English — which is everyone doing business online — Grammarly is the quiet upgrade that makes every message better.

Professionals who email daily

Students

Non-native English writers

Core Features of Grammarly

What Grammarly does, drawn from the vendor’s product documentation and our own use of the product — with the claims we could not confirm called out where they matter.

01Grammar & spelling

Real-time correction across every app you type in.

02Tone detection

Knows whether your message sounds friendly or formal.

03Clarity suggestions

Rewrites convoluted sentences into clean ones.

04Generative AI

Draft and rewrite text with specific instructions.

05Browser extension

Works on email, docs, social media, everywhere.

06Plagiarism detection

Checks your text against billions of web pages.

Grammarly: strengths and trade-offs

Our own read on the product — written from the vendor’s documentation and our use of it, not from a vendor brief.

What it does well

The best inline correction layer in the business — it works inside the browser, Word, email and most web editors without changing how you write.
Tone and clarity suggestions are specific enough to be actionable, not just "consider rephrasing".
Free tier covers grammar, spelling and basic tone, which is enough for casual writing.

Where it falls short

Premium is priced per person per month and is hard to justify if you write occasionally.
It optimises for clean, safe, slightly corporate English — apply every suggestion and your voice flattens.
It cannot judge whether an argument is good, only whether a sentence is clean.

Who should skip Grammarly

Writers with a deliberately distinctive voice who do not want it sanded down.
Anyone needing substantive editing of structure and argument — that is an AI assistant or a human editor.

Grammarly compared with the alternatives

The same dimensions, side by side — what each tool is actually better at, and which one to pick for the job you have.

Grammarly vs QuillBot

Read our QuillBot listing

Dimension	Grammarly	QuillBot
Cost	Free grammar and spelling; tone and clarity sit behind the paid tier.	Free paraphrasing with a word cap per pass.
Core job	Checking what you already wrote, as you type it.	Rewriting text into a different shape.
Where it works	Browser, desktop apps and Office add-ins.	Its own editor plus a browser extension.
Best for	People who write all day and want a safety net.	People who need text reworded.

Cost

Grammarly

Free grammar and spelling; tone and clarity sit behind the paid tier.

QuillBot

Free paraphrasing with a word cap per pass.

Core job

Grammarly

Checking what you already wrote, as you type it.

QuillBot

Rewriting text into a different shape.

Where it works

Grammarly

Browser, desktop apps and Office add-ins.

QuillBot

Its own editor plus a browser extension.

Best for

Grammarly

People who write all day and want a safety net.

QuillBot

People who need text reworded.

Which to pick. Grammarly as a net under everything you type, QuillBot for the rewrites themselves.

Grammarly vs ChatGPT

Read our ChatGPT listing

Dimension	Grammarly	ChatGPT
Cost	Free tier, paid once you want tone and clarity checks.	Free tier, paid for the strongest models.
Scope	Checks and suggests, sentence by sentence.	Writes whole drafts on request.
Consistency	Rule-based, so the same mistake always gets the same flag.	Output varies between runs.
Best for	Polishing your own writing.	Producing a first draft.

Cost

Grammarly

Free tier, paid once you want tone and clarity checks.

ChatGPT

Free tier, paid for the strongest models.

Scope

Grammarly

Checks and suggests, sentence by sentence.

ChatGPT

Writes whole drafts on request.

Consistency

Grammarly

Rule-based, so the same mistake always gets the same flag.

ChatGPT

Output varies between runs.

Best for

Grammarly

Polishing your own writing.

ChatGPT

Producing a first draft.

Which to pick. Grammarly to fix your writing, ChatGPT to write the thing you will then have to fix.

Comparisons are written from each vendor’s own product and pricing documentation, and from our own use of both tools. Last checked September 12, 2026. Sources: Grammarly, QuillBot, ChatGPT.

Pricing Model

Freemium. Free tier covers essential grammar; Premium (about $12/month) adds tone, clarity, and rewriting.

Check Pricing

How this listing was checked

Source. Pricing, plan names and feature details come from the vendor’s own product and pricing pages — for this tool, Grammarly — plans and pricing. This listing was last edited September 12, 2026.
Prices change. AI pricing and free tiers move faster than almost any other software category. Treat the figure here as a starting point and confirm it at the source before you buy — we re-check listings on a rolling schedule but cannot promise a page is current on the day you read it.
Independence. No vendor paid for this page or for its position, and no vendor reviews it before publication. See our review methodology and advertising disclosure.
Corrections. Found something wrong or out of date? Tell us — verified errors are corrected and dated.