Grammarly vs QuillBot 2026: Correction or Paraphrasing?

Grammarly wins if your problem is mistakes and tone in text you send to other people; QuillBot wins if your problem is rewriting and condensing text you already have. Grammarly Pro costs $12 a month billed annually ($144 a year), per Grammarly's Pro pricing article, and QuillBot Premium costs $99.99 a year, about $8.33 a month, on its App Store listing, both checked in October 2026. Both free plans are real, and most people should start there.

The two tools overlap more each year. QuillBot now sells a grammar checker, a plagiarism checker and an AI detector. Grammarly now rewrites sentences, generates text from prompts, and lists a paraphrasing tool and an AI humanizer among its web tools. The difference is the centre of gravity: Grammarly is a corrector that learned to rewrite, QuillBot is a paraphraser that learned to correct. This page compares them on price, free limits, correction, rewriting, detection and teams, with a verdict for each type of writer.

Toolradar data: Toolradar evaluated 139 AI writing tools for its AI writing ranking, updated October 17, 2026, and 73 of the 137 it ranks have a free plan, so a free tier is the norm in this category and the paid plan has to earn its place. The product records are on Grammarly's Toolradar page and QuillBot's Toolradar page, and the category view is our best AI writing tools guide.

Price: QuillBot is cheaper for one person

On yearly billing, QuillBot Premium costs $44.01 less than Grammarly Pro. For a single writer that makes QuillBot the cheaper bill, though not by enough to matter if you need Grammarly's corrections. Grammarly's monthly rate is $30, two and a half times its annual rate per month, and its quarterly plan sits in between. QuillBot's monthly plan in the iPhone app is $19.99, and QuillBot advertises 58% off for paying yearly. Monthly billing is the expensive mistake on both: a year of Grammarly at the monthly rate costs $360.

Grammarly Pro comes with a 7-day free trial, which is the cheapest way to test tone adjustment and full-sentence rewrites on your own email before paying. QuillBot has no trial line on its Premium page, but its free plan already includes the paraphraser, so you can judge the output before upgrading.

For teams, the comparison depends on the seat count. Grammarly Pro charges every seat the same rate up to 149 seats, so ten writers on annual billing cost $1,440 a year. QuillBot's team plan discounts by band, 10% off for 2 to 10 seats, 20% for 11 to 50 and 30% above that, so the per-seat price falls as the team grows. Grammarly's detailed tier breakdown is on our Grammarly pricing page.

Free plans: Grammarly corrects, QuillBot rewrites, neither does both well

Grammarly Free catches spelling, grammar and punctuation errors, shows the tone of a draft and gives 100 AI prompts a month for drafting and replying. What it will not do is rewrite: an unclear sentence gets a flag, not a fix, and tone adjustment, plagiarism checking and AI detection are all Pro features.

QuillBot Free is the mirror image. The paraphraser rewrites up to 100 words at a time in Standard and Fluency modes, the summarizer handles 1,200 words, the humanizer takes 100 words with limited usage, and the grammar checker fixes basic errors. A student rewriting a paragraph gets more from QuillBot Free; a professional sending ten emails a day gets more from Grammarly Free. If neither limit suits you, the best free AI grammar checkers and best free AI writing tools guides list the alternatives with looser caps.

Correction and tone: Grammarly

Grammarly's engine runs in its browser extension and its desktop and mobile apps, so the same corrections follow you from email to a document to a web form. Pro adds full-sentence rewrites, tone adjustment, help writing fluently in English, inclusive language suggestions and consistent citations. The tone detector labels a draft before you send it, which is the feature that keeps account managers and recruiters paying.

QuillBot's grammar checker corrects in 6 languages, and Premium adds advanced writing suggestions and tone insights, but the product is organised around pasting text into a tool rather than correcting as you type everywhere. If correction in every app is the job, Grammarly wins this round clearly.

Paraphrasing and summarising: QuillBot

QuillBot Premium opens the paraphraser fully: 9 built-in modes, from Academic to Simple, unlimited custom modes, a synonym slider, mode comparison, saved history, paraphrasing in 23 languages and translation into 40+ languages. The summarizer goes from 1,200 to 6,000 words and adds custom summaries. Grammarly Pro rewrites one sentence at a time and adjusts tone, which is editing rather than paraphrasing, and its 2,000 monthly AI prompts are built for drafting replies, not for reworking a 3,000-word document.

Anyone whose daily work is condensing reports, rewording drafts or translating between registers should pick QuillBot. That includes students, researchers and content teams repurposing long text. Premium lifts the 100-word cap, although QuillBot notes that usage limits apply and vary by surface, so a very heavy user should not read "full access" as unlimited.

Plagiarism, AI detection and humanising

Both paid plans include a plagiarism checker and an AI detector. QuillBot Premium states the limit, 25,000 words a month of plagiarism checking with citation detection in 100+ languages, and gives full access to its AI Humanizer with history and insights. Grammarly Pro bundles plagiarism and AI-generated text detection without a published word cap, and its humanizer sits among its separate web tools rather than on the Pro feature list.

The humanizer is the dividing line for students and freelancers. QuillBot puts it at the centre of Premium, while Grammarly sells correction and detection first. If your workflow runs text through a humanizer every day, QuillBot packages it; if you mainly need to check a draft, both plans do. Our best AI detectors and best AI humanizers guides compare the dedicated products, and AI for writing essays covers where these tools sit in student work.

Teams and enterprise: Grammarly has the deeper ladder

Grammarly Pro includes team features without a sales call: one style guide, one brand tone, two user groups, snippets for approved phrasing, Knowledge Share and a team analytics dashboard. Enterprise, sold through sales and available through Superhuman Go, adds SAML single sign-on, SCIM, data loss prevention, bring-your-own-key encryption, an audit logs API and unlimited prompts.

QuillBot's team plan covers a team style guide and dictionary, an admin panel with usage reports, a writer management dashboard, data controls and centralised billing. It does not list SSO or SCIM. A company that needs identity controls and brand voice at scale buys Grammarly; a school or agency that mainly needs rewriting seats buys QuillBot. For the wider stack a team might pair with either, see best AI tools for business.

What a year costs in four situations

The arithmetic favours QuillBot on price for one person and Grammarly on coverage. Someone who pays monthly at Grammarly spends $360 a year, so the billing cycle matters almost as much as the choice of tool.

Verdict: which one to pay for

Pay for Grammarly Pro if other people read what you write and you want it corrected where you write it, in email, chat, documents and forms, with tone control and a team style guide when the team grows. Pay for QuillBot Premium if your work is transforming text you already have: paraphrasing, summarising, translating, humanising and checking 25,000 words a month for plagiarism, at $44.01 a year less.

Most heavy writers end up with Grammarly Free plus QuillBot Premium, or Grammarly Pro alone, because QuillBot's free tier does not correct as you type and Grammarly's paid tier does not paraphrase at length. Running both paid plans costs about $244 a year and only makes sense for an editor who corrects other people's drafts and rewrites their own.

How we checked these prices

Louis Corneloup, founder of Dupple and Toolradar, prepared this comparison for people choosing between the two tools. We checked Grammarly's plans page and its Pro pricing article, QuillBot's Premium page, its team plan page and its App Store listing on October 18, 2026. The tool count comes from Toolradar's AI writing ranking. Publishing rules sit on the AIpresso about page.

FAQ

Is Grammarly or QuillBot better?

Grammarly is better for catching mistakes and controlling tone in everything you write, because it corrects inside your browser and apps as you type. QuillBot is better for rewriting, summarising and translating text you paste into it, with 9 paraphrasing modes and custom modes on Premium. Pick by the task you do most.

Which is cheaper, Grammarly or QuillBot?

QuillBot, for one person. Premium is $99.99 a year in its iPhone app, about $8.33 a month, while Grammarly Pro is $144 a year. On monthly billing Grammarly is $30 and QuillBot's iPhone app lists $19.99. For teams, Grammarly charges the same per seat up to 149 seats, while QuillBot discounts 10% to 30% by seat band.

Is QuillBot free?

Yes. The free plan paraphrases up to 100 words at a time in Standard and Fluency modes, fixes basic grammar, summarises up to 1,200 words, and gives limited use of the humanizer and AI detector. Premium removes the word cap, adds 9 built-in modes and custom modes, 23 paraphrasing languages and 25,000 words a month of plagiarism checking.

Does Grammarly paraphrase like QuillBot?

Partly. Grammarly Pro rewrites full sentences with a click and adjusts tone, and every plan has AI prompts that draft or reply, 100 a month on Free and 2,000 on Pro. Its Pro plan does not offer QuillBot's mode-based paraphrasing of whole passages, custom modes or a synonym slider.

Can I use Grammarly and QuillBot together?

Yes, and many writers do. Grammarly Free runs in the browser and corrects as you type, and QuillBot Premium handles paraphrasing and summarising in its own editor. That combination costs only the QuillBot subscription. Paying for both Pro and Premium only makes sense for editors who rewrite long documents and correct other people's work daily.

Which has the better AI detector and plagiarism checker?

Both paid plans include both tools. QuillBot publishes its plagiarism limit, 25,000 words a month across 100+ languages, while Grammarly does not publish a cap. QuillBot also puts its AI Humanizer on Premium with full history. Treat any detector score from either tool as a signal to review a passage, not as proof of who wrote it.

If you want the price changes without rechecking the vendor pages, get the AIpresso brief.

Cite this: AIpresso, "Grammarly vs QuillBot 2026: Correction or Paraphrasing?", October 2026.

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