QuillBot vs Grammarly (October 2026): Plans, Prices and Which Fits

Disclosure: this comparison contains no affiliate links today, and every vendor link is a plain link. We have not been approved for either company’s affiliate program, so nothing here is paid for. Our affiliate disclosure explains how the rest of the site is funded. Order and conclusions here are not for sale.

By Lennit Herrera, founder and editor, AI Tool Stack Reviews  ·  Last updated October 8, 2026

The verdict: on the vendors’ own published plans, Grammarly Pro is the better pick if your main need is checking and polishing writing in the apps you already use, and QuillBot Premium is the better pick if your main need is rewriting, summarizing and checking sources, and it costs less on an annual plan ($99.95 a year against Grammarly’s $144). Month to month the gap is wider: QuillBot lists $19.95, Grammarly $30. The catch on QuillBot’s side is that its pricing page also carries other test price sets, with annual prices up to $149.95, so the figure you see at checkout may not be the one on this page. Neither company can promise your writing will be better, and both publish warnings that their AI detectors can be wrong.

Prices, plan limits and feature lists were read on each vendor’s own plans, product and support pages on October 8, 2026. We do not use either tool for this comparison, so there are no hands-on impressions on this page.

On this page

• The short list
• Comparison table
• How we compared them
• Grammarly: the all-purpose writing checker
• QuillBot: the rewriting toolkit
• The price ladder, plan by plan
• What you get for free
• Paraphrasing and rewriting
• Grammar, tone and style checking
• Plagiarism, AI detection and what the vendors admit
• Where your text goes
• Apps and where each one works
• Where the vendors’ own pages disagree
• Who each one is right for
• What this comparison cannot tell you
• Frequently asked questions

The short list

• Grammarly — for the writer, student or professional who wants errors, tone and clarity checked across email, documents and the web, and who wants one product that also covers plagiarism checking and an AI-text detector on Pro.
• QuillBot — for the student, researcher or content writer who spends more time rewording, summarizing and citing than proofreading, and who wants the lower annual price.
• Neither — if you only need spelling and basic grammar. Both vendors give that away on a free plan, so test the free versions on your own writing before paying for anything.

Comparison table

Source: grammarly.com/plans and quillbot.com/premium, read October 8, 2026. Grammarly’s page leads with the plan features; its prices sit in the page’s embedded plan data (monthly $30, quarterly $60, annual $144). QuillBot’s page shows $8.33 a month billed annually, and its embedded data gives $19.95 monthly and $79.95 semi-annual.

How we compared them

We compared two products across 12 points: price per billing period, free plan limits, free trial, paraphrasing, grammar and tone checking, plagiarism checking, AI-text detection, AI chat limits, language support, apps and integrations, privacy statements and the vendors’ own caveats. Every figure comes from the vendor’s own plans, feature and support pages, read on October 8, 2026. Where the two companies’ pages disagree with each other or with themselves we say so (see the section on that).

We do not test these products ourselves. No accuracy score, speed figure or detection rate on this page comes from our own use. Where a performance claim appears, it is the vendor’s and is labelled as theirs. Prices change and some vendors show different prices to different visitors, so check the plan page on the day you buy.

Grammarly: the all-purpose writing checker

Grammarly’s plans page describes its free plan as "write without spelling and grammar mistakes", with a view of your writing tone and 100 AI prompts a month. Pro adds the things most people mean when they say they want "better" writing rather than "correct" writing: rewriting full sentences with a click, adjusting tone, writing fluently in English, using inclusive language, keeping citations consistent, detecting AI-generated text and catching accidental plagiarism. It raises the AI allowance to 2,000 prompts per member per month and offers a 7-day free trial.

What it is good at, per the vendor’s pages. Grammarly leans into being present where you write. Its support footer lists a Windows app, a Mac app, browser extensions for Chrome, Safari, Firefox and Edge, add-ins for Microsoft Office and Google Docs, and mobile apps for iPhone, iPad and Android. For someone who writes in many places, that is the product’s main pitch.

Watch out for.

• The month-to-month price is $30. The annual price works out to about $12 a month, so paying monthly costs two and a half times as much for the same plan.
• Several of the more useful features, such as full-sentence rewrites, tone adjustment and plagiarism detection, are marked as unavailable on Free on the plans comparison.
• Grammarly’s language promise on Pro is English. If you write in other languages regularly, read the next product’s language list before you decide.

Best for: people who write in many apps and want a proofreader that follows them. Skip it if: you mostly want to reword text rather than correct it, or you want the lower annual price.

For a longer look at this product on its own, see our Grammarly review.

QuillBot: the rewriting toolkit

QuillBot’s plans page frames Premium around rewriting and refining: "full access to paraphrasing", unlimited paraphrase modes, advanced grammar recommendations, full access to a humanizer, custom summaries, full access to its AI detector and a plagiarism check. The company says it is trusted by over 35 million writers, which is its own marketing figure, not an independent count.

What it is good at, per the vendor’s pages. The Premium column on QuillBot’s feature table is where the product shows its shape. Paraphrasing is in nine built-in modes plus unlimited custom modes, in 23 languages. Text translation covers 40+ languages. Summaries go up to 6,000 words on Premium against 1,200 on Free. The plagiarism checker handles 100+ languages and accepts .txt, .pdf, .docx and .html files, and a citation generator is built in.

Watch out for.

• The pricing page’s embedded data holds several price sets. The default is $99.95 a year and $19.95 a month, but the same data lists annual prices of $109.95, $119.50, $119.95 and $149.95, and monthly prices up to $23.95. The price shown to you may differ from the one here.
• The plagiarism checker is capped at 25,000 words a month. The vendor says you can buy more but publishes no price on that page.
• AI chat and image generation are listed as "limited usage" and "access with usage limits", with no numbers. Those are not the reason to pick QuillBot.

Best for: students and content writers who rework text, summarize sources and cite. Skip it if: you want proofreading integrated into every app you type in, with 100% English-first focus.

The price ladder, plan by plan

Here are the two paid plans across each billing period the vendors show.

The arithmetic: a year of QuillBot Premium at the default price is $44.05 cheaper than a year of Grammarly Pro. Month to month, Grammarly Pro costs $10.05 more per month. Someone paying both annually spends $243.95. QuillBot’s page labels its annual plan as 58% off compared with paying monthly; Grammarly’s page does not state a discount.

Team and business plans exist on both sides (QuillBot Team, Grammarly Enterprise), but QuillBot lists no price for its team plan and Grammarly asks you to contact sales. QuillBot says teams of five or more members get a single invoice with a volume discount.

What you get for free

Both products give away real functionality, and on that point the plans pages are straightforward.

• Grammarly Free: spelling and grammar checks, a view of your writing tone, and 100 AI prompts a month.
• QuillBot Free: paraphrasing up to 100 words in two modes (Standard and Fluency), basic grammar fixes, humanizing up to 100 words with limited usage, basic summaries of up to 1,200 words, and limited use of its AI detector. QuillBot’s separate grammar checker page also says unlimited grammar checks are free.

The practical difference is the shape of the limit. Grammarly’s free plan limits what kinds of help you get. QuillBot’s free plan limits how much text you can run through each tool. If you check long documents for errors, Grammarly Free and QuillBot’s free grammar checker overlap. If you paraphrase paragraphs or summarize long articles, QuillBot’s free caps will hit quickly.

Paraphrasing and rewriting

This is the clearest dividing line between the two. On QuillBot’s plans comparison, paraphrasing is the first row: up to 100 words on Free, full access on Premium, standard and fluency modes on Free versus nine unique modes plus custom modes on Premium, a paraphrase history, an adjustable synonym slider and paraphrasing in 23 languages.

Grammarly handles rewriting differently. On Pro it rewrites full sentences with a click and adjusts tone, and it offers generative AI prompts (2,000 a month). That is closer to assisted editing than to a dedicated paraphrasing tool with named modes. If your question is "make this passage sound different from the source", QuillBot’s page is built around that job. If it is "make my own draft clearer", Grammarly’s is. If the thing you are rewriting is a resume, our best AI resume builder guide covers tools made for it.

A note on academic use: rewording someone else’s passage without credit is the paraphrasing form of plagiarism that Grammarly’s own plagiarism page describes. Either tool can reword text; neither makes it your own work. Check your school’s or employer’s rules on AI assistance before using any rewriting feature on graded or contracted work. Our AI tools for teachers guide touches on the classroom side.

Grammar, tone and style checking

Both products check spelling, grammar and punctuation. QuillBot’s grammar checker page describes unlimited free checks, work across dialects, and correction in "6+ different languages", and its Premium plan adds "advanced grammar recommendations" and tone insights. Grammarly puts the tone view in its free plan and adds tone adjustment, inclusive-language suggestions and fluency help on Pro.

We have no independent accuracy data comparing the two and did not find a named lab test of both, so we do not rank them on error-catching. The honest comparison is by feature set: Grammarly’s Pro list is written around English-language polish, QuillBot’s around a wider set of tools with a grammar checker as one of them. Try both free plans on a few of your own paragraphs; that is a better test than any claim here.

Plagiarism, AI detection and what the vendors admit

Plagiarism checking. Grammarly says its checker compares your text against billions of web pages and ProQuest’s academic databases; one answer on the same page puts the web index at over 16 billion pages. QuillBot says its checker works in 100+ languages, produces a report with source links, and caps Premium at 25,000 words a month with the option to buy more. Both are paid features. Neither vendor publishes an independent accuracy test on those pages.

AI-text detection. Grammarly’s AI detector page claims "99% detection accuracy" and a #1 rank on the RAID benchmark. Those are vendor claims; we did not read the benchmark ourselves, so treat them as marketing until you have. The same page also says "no AI detector is 100% accurate" and that human-written text can be flagged. QuillBot offers a limited AI detector on Free and full access on Premium.

This matters for students and writers. A detector score is an estimate, not a verdict, and the vendors’ own pages say so. If your work might be checked by one, keep your drafts and notes. Grammarly’s "Authorship" feature, described on its plagiarism page, is designed to categorize where text came from (typed, pasted, AI-generated), and QuillBot lists a "humanizer". Whether a humanizer is appropriate depends on the rules of the place you are writing for, and we do not endorse using one to misrepresent AI use.

Where your text goes

Grammarly’s support page on data security says it never sells user content to third parties for advertising or any other purpose, and that it makes its money from selling subscriptions. It also says sensitive text such as card numbers or passwords is excluded on a best-efforts basis, and that some features may record input only with explicit permission. Read the page yourself at Grammarly’s support center. Its plagiarism page also says your text is not publicly searchable or stored in a database others can access.

We did not find a data-use statement on QuillBot’s plan or tool pages that we could quote accurately, so we make no privacy claim about QuillBot here. If you plan to paste confidential or client text into either tool, read both privacy policies in full first and check your employer’s rules.

Apps and where each one works

• Grammarly: Windows and Mac apps, browser extensions for Chrome, Safari, Firefox and Edge, Microsoft Office and Google Docs, iPhone, iPad and Android (from the support footer, read October 8, 2026).
• QuillBot: Chrome and Edge extensions, a macOS app, a Word add-in, an Android keyboard and app, and an iOS keyboard and app (from the Premium page). Its footer also links a Safari extension and a Windows app.

QuillBot allows Premium on all your devices but only 10 at a time, per its FAQ. It also lets you pause a subscription without cancelling it. We did not find an equivalent statement on Grammarly’s plans page.

Where the vendors’ own pages disagree

• QuillBot’s mode count. The Premium page’s feature table says "9 unique modes", while a banner on the same page says "10+ different modes". The counts may include Standard and Fluency or custom modes differently. We say nine built-in modes plus custom, per the table.
• QuillBot’s price sets. The page’s embedded data holds multiple annual prices ($99.95 to $149.95). The default and the displayed $8.33 a month agree with $99.95 a year.
• Grammarly’s prices. The plans page lists features without prices in its visible text; the amounts sit in embedded plan data. Our own earlier review states the same $144 and $30 figures.
• Third-party comparisons. Many comparison pages quote older numbers, for example QuillBot free tiers capped at 125 words. QuillBot’s own page today says 100 words. Always prefer the vendor’s current page.

Who each one is right for

• A student writing essays: start with both free plans. If you need plagiarism checks and rewriting help, QuillBot Premium is cheaper on an annual plan; if you want an all-round polish across Google Docs and email, Grammarly Pro. Check your school’s rules on AI tools first.
• A freelance writer or blogger: Grammarly Pro for polish and tone across the apps you draft in. Our AI writing tools roundup and guide to using AI for content cover the drafting side.
• A researcher summarizing sources: QuillBot Premium, whose summary limit is 6,000 words and which has a built-in citation generator.
• A non-native English writer: try Grammarly Pro’s fluency features and QuillBot’s paraphraser side by side on free plans. QuillBot lists 23 paraphrasing languages and 6 grammar languages; Grammarly’s Pro emphasizes English fluency.
• A team: Grammarly Enterprise requires contacting sales. QuillBot’s Team plan also lists no price. Get quotes before comparing.

What this comparison cannot tell you

• Which one catches more errors. We have no independent test comparing the two and do not run our own.
• How accurate either AI detector is. Only vendor claims are published, and both vendors warn against relying on a score.
• What you will pay. QuillBot shows several price sets; Grammarly sometimes runs promotions. Read the checkout page.
• Refund terms. We did not verify either company’s refund policy for this page. Check before you pay for a year.

If you buy either, measure it: take three of your own documents, run them through the free plan first, note what you would have missed, and only then pay.

Frequently asked questions

Is QuillBot cheaper than Grammarly?

On the default price sets, yes. QuillBot Premium is $99.95 a year or $19.95 a month; Grammarly Pro is $144 a year or $30 a month. QuillBot’s page also carries higher test prices, so confirm at checkout.

Does Grammarly have a free trial?

Its plans page offers a 7-day free trial of Pro. QuillBot’s plans page shows a Free plan rather than a trial.

Can QuillBot replace Grammarly?

For basic grammar and spelling, QuillBot’s free grammar checker overlaps. For checking across many apps and for English-focused tone and fluency help, Grammarly’s feature list is deeper on paper. For paraphrasing and summarizing, QuillBot’s is deeper.

Which is better for students?

Depends on the job. QuillBot is built around paraphrasing, summaries, citations and a plagiarism check; Grammarly is built around proofreading and tone, with plagiarism and AI detection on Pro. Follow your institution’s AI policy either way.

Are the AI detectors reliable?

Not conclusively. Grammarly’s own page says no AI detector is 100% accurate and that human-written text can be flagged. Do not treat a score as proof.

Do they work with Microsoft Word and Google Docs?

Grammarly lists add-ins for Microsoft Office and Google Docs. QuillBot lists a Word add-in and browser extensions; we did not find a Google Docs add-in on its Premium page.

Which supports more languages?

QuillBot lists paraphrasing in 23 languages, grammar correction in 6, translation to 40+ and plagiarism checks in 100+. Grammarly’s Pro lists fluency help in English.

Can I pause or cancel?

QuillBot’s FAQ says you can pause Premium from your account page without being billed for that time. We did not verify Grammarly’s cancellation terms for this page.

Bottom line

Pick Grammarly Pro if you want one proofreader that follows you across apps and you are happy to pay $144 a year for it. Pick QuillBot Premium if you reword, summarize and cite more than you proofread, and want to pay $99.95 a year. Start on the free plans, keep your own before-and-after notes, and re-read the vendor’s plan page on the day you buy.

Sources read October 8, 2026: Grammarly plans, Grammarly plagiarism checker, Grammarly AI detector, QuillBot Premium, QuillBot grammar checker, QuillBot plagiarism checker.

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