Grammarly vs QuillBot in 2026: Which Writing Tool Deserves Your Money

If you write original work and want it clean, buy Grammarly. If you rewrite existing text often, buy QuillBot. Most people need only one of these tools, and buying both wastes money unless you do both jobs every day. This comparison gives you the prices, the free limits, and the trade offs, so you can make the pick in ten minutes and move on with your work.

These tools solve different problems even though both call themselves writing assistants. Grammarly watches what you type and fixes it as you go, catching grammar slips, unclear sentences, and tone problems before anyone else reads them. QuillBot takes text you already have and says it another way, shortens it, or turns it into a summary. That difference decides almost every recommendation in this guide, so keep your own job in mind as you read: are you fixing your own writing, reworking the words of another writer, or doing both?

Prices below are reported United States prices checked in October 2026 from vendor pricing pages and dated 2026 reviews. Prices vary by region, promotion, and student status, so confirm the checkout price before you pay. Where a figure comes from a review rather than a vendor page, this guide says so plainly. Nothing here is a quote, and no price in this guide should replace the checkout page you actually pay on.

One more note before the detail. Neither tool makes you a better writer on its own, and neither one checks your facts. Both can polish a wrong sentence into a smooth wrong sentence that reads well and says something false. Use them to clean up wording, then read the result yourself and check every claim that matters. That habit matters more than any feature inside either product.

The verdict and how we compared

Grammarly wins for most people because it works everywhere you write and fixes your own words at the moment you type them. QuillBot wins for students and researchers who rewrite and summarize constantly, because its paraphrasing modes and citation tools match that workflow. If you do both jobs daily, owning both costs about 20 dollars a month on annual billing, which is the only case where two subscriptions make sense.

We compared published feature lists, published limits, and reported prices, and we weighed each tool on the job it was built for rather than on a score we invented. That means Grammarly was judged mainly as an editor and QuillBot mainly as a rewriter, with plagiarism checking, detection, coverage, and privacy judged as supporting jobs. We did not run a seeded error test or invent accuracy percentages, because a small home test would prove little and a fake precise score would mislead you.

Reported review ratings point the same way as the feature comparison. Reported G2 ratings put Grammarly at 4.7 out of 5 from more than 13,000 reviews and QuillBot at 4.4 out of 5 from a much smaller review base, so treat the gap as a sign of scale as much as quality. A rating built on thousands of reviews carries more weight than one built on a few dozen, even when the star averages look close.

The method leads to one practical rule: pick by your daily job, not by feature count. A longer feature list does not help if the extra features sit unused while the one feature you need stays weak. A student who rewrites all day gains nothing from Grammarly tone controls, and a professional who writes client email all day gains nothing from QuillBot paraphrasing modes.

Grammarly vs QuillBot at a glance

The table below is the short version of this whole comparison. Grammarly leads on grammar checking, tone, and coverage across apps. QuillBot leads on paraphrasing, summarizing, and citations. Prices shown are reported annual billing figures in United States dollars, and both free plans are usable enough that many buyers never need to pay at all.

Read the table as a shortlist tool, then read the section that matches your job. If grammar is your bottleneck, the grammar section decides for you. If rewriting is your bottleneck, the paraphrasing section decides for you. The table alone cannot capture limits like the 125 word free paraphrasing cap or the 25,000 word plagiarism cap, and those limits change real buying decisions.

One note on annual prices before you compare them: annual billing hides an upfront charge of 144 dollars for Grammarly Pro and 99.95 dollars for QuillBot Premium. Monthly billing costs far more over a year for the same product, so treat the monthly figure as a trial price, not the real price of keeping the tool.

Grammar and clarity checking

Grammarly is the stronger grammar and clarity checker, by a clear margin. It checks as you type across apps, explains each fix in plain language, and goes beyond spelling into clarity, tone, and word choice on the paid plan. The QuillBot grammar checker covers spelling, punctuation, and basic grammar well enough for everyday use, but it does not match Grammarly depth on style, and that gap shows up fast in professional writing.

The Grammarly free plan already covers a lot: basic spelling and grammar checks, tone detection, and 100 AI prompts a month. For many casual writers that free plan is enough, because it catches the typos and grammar slips that make a message look careless. It does not include full sentence rewrites, tone adjustment, or plagiarism checking, and those are the upgrades that define the paid plan.

Grammarly Pro adds full sentence rewrites, tone adjustment, word choice and fluency suggestions, and 2,000 AI prompts per member per month, plus plagiarism checking and AI text detection. For a professional who writes all day, the sentence rewrites and tone controls are the features that earn the fee, because they turn a rough draft into a polished message without a second pass. A writer who only needs typo catching should stay on the free plan and save the money.

The QuillBot grammar checker is a side tool inside a rewriting product, while Grammarly grammar checking is the whole product, and that shows in daily use. QuillBot handles everyday errors fine for a student polishing an essay, and it sits conveniently inside the same workspace as the paraphraser. But if grammar is your main problem, Grammarly free beats QuillBot free, and Grammarly Pro beats QuillBot Premium for this job, so do not buy QuillBot for grammar alone.

Paraphrasing and rewriting

QuillBot is the better paraphrasing tool, and it is not close. Nine modes, a synonym slider, and unlimited paraphrasing on Premium give you control that Grammarly does not offer at any price. Grammarly rewrites sentences, but its rewrites are conservative and aimed at clarity, not at restating an idea in a new voice or a new register.

The QuillBot modes cover most rewriting jobs: Standard, Fluency, Formal, Academic, Simple, Creative, Expand, Shorten, and a Humanizer mode in newer listings. Free users get Standard and Fluency only, capped at 125 words at a time. That cap is the real reason to pay, because splitting a long essay into 125 word chunks gets old fast, and it breaks your train of thought on every paste.

QuillBot Premium opens all modes, custom modes, and unlimited paraphrasing, which changes how you work with sources. You can restate a dense source paragraph in your own structure, tighten a wordy draft, or shift a casual draft into a formal register without rewriting every sentence by hand. Always review the output before you use it, because a paraphrase can change meaning, especially with numbers, names, and technical terms, and a changed meaning is worse than an awkward sentence.

Grammarly plays a different game here. Its Pro sentence rewrites fix awkward or wordy sentences inside your own draft, which is editing, not paraphrasing. That distinction matters for the buying decision. If your job is to say the same idea differently, QuillBot is the tool. If your job is to say your own idea more clearly, Grammarly is the tool, and buying the other one will leave you frustrated.

Plagiarism checking

Both paid plans include a plagiarism checker, and QuillBot has the edge on academic sources. QuillBot Premium scans up to 25,000 words a month against web pages and academic databases, which fits student work that draws on journals and papers. Grammarly Pro scans against billions of web pages and published papers, which fits professional and general writing well. Either one catches copied passages, and neither one proves originality.

Neither free plan includes a plagiarism checker, and that matters for students choosing a free account. Do not assume a free account checks originality, because it does not, and a student who submits work believing it was scanned has learned nothing about the draft. If a plagiarism scan is the reason you are paying, QuillBot Premium is cheaper, and its academic database coverage fits student work better than a general web scan.

Keep the limits of these checkers in view. A clean scan is not a clean conscience, because paraphrased ideas still need citations, and a checker can miss translated or heavily rewritten copying. Use the checker as a safety net after you have written and cited properly, not as a way to turn someone else work into your own. The checker catches accidents, it does not grant permission.

AI detection and academic use

Both tools offer AI detection, and neither detector should decide anything important. Grammarly Pro flags passages that look AI generated, and QuillBot sells an AI Detector and a Humanizer side by side. Detectors guess from patterns in the text, they do not know who wrote it, and they flag human writing too, so a score is an opinion, not a verdict.

Schools and universities set their own rules on AI assisted writing, and those rules change often. Some ban AI generated text outright, some allow editing help, and some require disclosure of any AI help used. A detector score will not save a student who broke a policy, and a clean score will not prove compliance, because policies judge what you did, not what a tool guessed about your text.

The Humanizer deserves a plain warning. QuillBot Humanizer rewrites AI generated text so it reads more naturally, and using it to hide AI authorship from a detector or a teacher is a policy problem, not a clever workaround. If your school requires original work, write it yourself and use these tools to edit, not to produce the draft, because the draft is where the learning happens and where the policy bites.

The practical rule is simple. Use Grammarly detection as a second opinion on your own draft, use QuillBot detection the same way, and never submit a detector verdict as evidence about someone else. Teachers and editors should judge the work itself, the argument, the evidence, and the citations, not a score from a tool that cannot see how the text was made.

Integrations and apps

Grammarly works in far more places than QuillBot, and that gap is the biggest practical difference after paraphrasing. Grammarly runs as a browser extension, a desktop app, and a mobile keyboard, and it checks inside Word, Google Docs, Gmail, Slack, LinkedIn, and most text boxes on the web. Wherever you type, Grammarly is already there, which is exactly why it catches mistakes other tools miss.

QuillBot works through its website and through extensions for Chrome, Edge, and Safari, plus a Word add in and Google Docs through the browser extension. That covers the student workflow well, because research happens in a browser and drafting happens in Docs or Word. It does not follow you into email, chat, and every other app the way Grammarly does, so it helps only when you remember to open it.

So the question is where you write. If you write in one or two apps, QuillBot coverage is enough, and its browser workflow will feel natural. If you write everywhere, email, documents, social posts, and chat, Grammarly is the only one of the two that keeps up. A checker you have to open separately gets used less than one that is already there when you start typing.

Pricing: free plans, monthly plans and annual plans

QuillBot Premium costs less than Grammarly Pro on every billing term, and both free plans are genuinely usable. Grammarly Pro costs 30 dollars a month billed monthly, 20 dollars a month billed quarterly at 60 dollars every three months, or 12 dollars a month billed annually at 144 dollars a year. QuillBot Premium costs 19.95 dollars a month billed monthly, 39.95 dollars every three months, or 99.95 dollars a year, which works out to about 8.33 dollars a month.

The annual totals tell the real story: 144 dollars against 99.95 dollars, a gap of about 44 dollars a year. Buying both tools on annual billing costs about 20 dollars a month combined. Monthly billing is the expensive way to buy either tool, because Grammarly monthly costs 360 dollars over a year against 144 dollars annual, and QuillBot monthly costs about 239 dollars over a year against 99.95 dollars annual. Treat monthly billing as a trial, then switch to annual or cancel.

The free plans deserve a fair comparison too. Grammarly free gives basic grammar checks, tone detection, and 100 AI prompts a month, which makes it the better everyday free tool for fixing your own writing. QuillBot free gives paraphrasing up to 125 words at a time in two modes, plus limited grammar, summarizer, and translator use, which makes it the better free tool for occasional short rewrites. Many casual writers never need to pay either company.

Discounts and cautions round out the picture. Reported QuillBot team pricing runs about 7.50 dollars per seat a month with a reported student rate about 6.25 dollars a month, and a reported 3 day money back guarantee applies to Premium. Grammarly offers a reported 7 day Pro trial. Prices vary by region and promotion, so check the checkout page, watch renewal dates, and remember that annual billing charges the full year up front, which surprises buyers who expected a monthly charge.

Privacy and data handling

Both tools hold your text on their servers while they process it, so do not paste anything confidential into either one without reading its data terms first. That rule covers client files, unpublished research, medical details, and anything covered by a nondisclosure agreement. A writing checker is a processing service, not a vault, and your text passes through systems you do not control.

Grammarly sells admin controls, single sign on, and analytics on its Enterprise plan, which is the right tier for a team handling client work, because the team controls accounts and access in one place. QuillBot sits inside Learneo, an education company, and its products serve students and schools, so student users should read the Learneo privacy terms and their school policy together before uploading coursework. Neither free tier is the right place for sensitive work, because free accounts rarely carry the data terms a professional needs.

Three practical rules cover most cases. Keep client names and confidential facts out of free accounts entirely. Prefer paid business terms for team work, where the contract states retention and access rules. Delete drafts you no longer need instead of leaving them in a tool account forever. If your employer or school gives you an approved tool, use that one instead of a personal account, because the approved account carries the data terms your organization already accepted.

The final pick: who should buy which

Pick Grammarly if you write original work across many apps and your main problem is mistakes, clarity, or tone. Pick QuillBot if you rewrite, summarize, and cite constantly and your main problem is reworking existing text. Pick neither if the free plans already cover you, which is true for many casual writers, and spending money to solve a problem you do not have is the worst outcome in this comparison.

Students should start with QuillBot. QuillBot Premium is the better student buy for essays and research, because paraphrasing, summarizing, and citations match student work, and it costs less than Grammarly Pro. Add Grammarly free alongside it for grammar, and you cover both jobs for 99.95 dollars a year. A student whose main problem is grammar in original essays should flip that order: Grammarly Pro first, QuillBot free for the odd rewrite.

Professionals and content writers should match the tool to the job that pays. Grammarly Pro earns its fee when you write client email, reports, and posts all day in many apps, because it catches mistakes everywhere you type. QuillBot Premium earns its fee when you refresh old content, repurpose articles, or rewrite source material daily. Doing both jobs daily justifies both subscriptions at about 20 dollars a month on annual billing, while doing one job well with one tool beats paying for two tools you half use.

Try before you pay, and test on real work, not on a demo paragraph. Run Grammarly free for a week on your actual email and documents, then run QuillBot free on a real rewrite task, then buy only the one that changed your output. Start any paid trial on a busy week, set a reminder before the renewal date, and cancel anything that did not earn its fee. The best writing tool is the one you actually open every day, and the free plans will tell you which one that is before you spend anything.