Choosing between QuillBot and Grammarly isn’t a feature checklist, it’s a question of what kind of writer you want to be. Grammarly built its empire as the spell-and-grammar incumbent, the always-on safety net that catches comma splices and passive voice across every browser tab you open. QuillBot took a different path, leaning into paraphrasing, rewriting, and summarising first, then bolting grammar checking and an AI writer on top once it had earned trust with students and researchers.
That difference shows up everywhere, in pricing, in the editor experience, in how each tool treats your raw draft, and in who each platform tries hardest to keep happy. Grammarly wants to be the invisible editor that protects your reputation on every email and document. QuillBot wants to be the writing partner that helps you generate, rephrase, and polish ideas from a blank page to a finished piece.
This deep dive compares both honestly, where each one wins, where each one over-promises, and which one I’d actually recommend if you’re picking today in 2026.
⚡ Quick Verdict
- →Pick QuillBot if you rewrite, paraphrase, summarise, or generate content daily and want an AI writing suite that includes grammar checking, citation help, and a paraphraser that actually changes the sentence.
- →Pick Grammarly if your priority is bulletproof grammar, tone, and clarity suggestions across every app you use, and you write mostly original content from scratch.
📋 Table of Contents
QuillBot Overview
QuillBot started in 2017 as a focused paraphrasing tool built by three computer-science students and has grown into a full AI writing suite trusted by more than 50 million users worldwide. Today you get a paraphraser with seven rewrite modes (Standard, Fluency, Formal, Simple, Creative, Expand, Shorten), a grammar checker, summariser, citation generator, plagiarism checker, translator, and an AI Co-Writer that drafts long-form content from prompts.
The paraphraser is the headline product, it doesn’t just swap synonyms, it restructures sentences while preserving meaning, which is why students, researchers, ESL writers, and content marketers keep it open in a second tab. For broader context on rewriting workflows, see our roundup of the best AI paraphrasing tools for writers. QuillBot’s strength is doing the rewriting and ideation work that Grammarly only nudges around, all wrapped in a free tier that’s genuinely usable.
Grammarly Overview
Grammarly launched in 2009 and effectively defined the consumer grammar-checker category. With 30+ million daily users, browser extensions for Chrome, Safari, Edge, and Firefox, native apps for Mac and Windows, and a mobile keyboard for iOS and Android, it’s the most ubiquitous writing assistant on the planet. Its core checks cover grammar, spelling, punctuation, clarity, engagement, delivery, and tone.
Grammarly Premium adds full-sentence rewrites, vocabulary enhancement, plagiarism detection, brand tone profiles, and the GrammarlyGO generative AI assistant for drafting, replying, and ideating. Its biggest strength is reach, suggestions appear inline wherever you type, from Gmail to Google Docs to Slack. The trade-off is that Grammarly’s rewrites and AI content stay conservative by design, it would rather make your writing safer than make it different.
Pricing Compared
QuillBot’s Free plan covers unlimited grammar checking, paraphrasing up to 125 words at a time, and summarising up to 1,200 words, with the Standard and Fluency modes only. Premium is $19.95/month, $13.33/month billed quarterly, or $99.95/year (about $8.33/month). Premium unlocks unlimited paraphrasing input length, all seven rewrite modes, plagiarism checking (20 pages/month), faster processing, and the AI Co-Writer for long-form drafting.
Grammarly’s Free plan covers basic grammar, spelling, and tone suggestions. Premium is $30/month, $20/month quarterly, or $144/year ($12/month) and adds full-sentence rewrites, plagiarism detection, vocabulary suggestions, GrammarlyGO prompts (1,000/month), and tone refinements. Grammarly Business starts at $15/user/month for teams of three or more. At the annual rate, QuillBot Premium is roughly $44/year cheaper than Grammarly Premium while bundling paraphrasing, summarising, and citation tools that Grammarly simply doesn’t ship.
Paraphrasing & Grammar Features
QuillBot‘s paraphraser is the deepest in the category. Drop in a paragraph, pick a mode (Fluency keeps tone close to the original; Formal lifts academic register; Creative reshapes structure heavily), and it returns a rewrite with synonyms highlighted and sliders to tune how aggressive the rewording is. The grammar checker is a clean Premium-grade tool that flags issues inline and lets you apply or ignore in one click.
Grammarly’s grammar engine is the gold standard, more rule depth, better catch rate on subtle tense and clarity issues, and stronger tone analysis. But its “rewrite” feature is a Premium add-on that mostly tightens sentences rather than restructuring them. If you need to rephrase a paragraph so it reads as truly different, Grammarly will polish it; QuillBot will rewrite it. For the work most writers actually do (turning research notes into fresh prose), QuillBot’s paraphraser is in a different league.
Accuracy & AI Quality
On pure grammar accuracy, Grammarly still edges ahead in independent tests. Its Premium engine catches roughly 5 - 10% more issues than QuillBot’s grammar checker on the same sample text, particularly around comma placement, restrictive clauses, and parallel structure. If a single grammar slip would damage your reputation (legal docs, client proposals, executive emails), Grammarly’s depth is reassuring.
On generative AI output, QuillBot’s Co-Writer and paraphraser feel more practical for everyday content work. Generated drafts come back with cleaner structure and lower AI-detector flag rates than GrammarlyGO output in side-by-side tests. For students, researchers, and ESL writers who want to learn from the rewrites (each paraphrase highlights what changed and why), QuillBot is the more transparent tool. For executives or marketers who want polish without thinking, Grammarly wins on invisible reliability.
Editor & User Experience
Grammarly’s UX is its competitive moat. Suggestions appear inline as you type in Gmail, Google Docs, Word, Slack, LinkedIn, and almost any text field on the web. The browser extension, desktop app, and mobile keyboard mean you rarely leave your normal workflow. Click a flagged word, accept or dismiss, keep typing, that’s the whole loop.
QuillBot’s primary UI is the web app, where the paraphraser, summariser, grammar checker, and AI Co-Writer live as tabs. It also offers a Chrome extension and a Word add-in, but the experience is most powerful inside its own editor because that’s where all seven rewrite modes and the AI Co-Writer surface. For copy-paste rewriting and structured AI drafting, QuillBot wins. For ambient grammar help across every app you use, Grammarly wins.
Integrations & Platforms
Grammarly’s footprint is enormous, browser extensions for all major browsers, native Mac and Windows apps, Microsoft Word and Outlook add-ins, a Google Docs integration, iOS and Android keyboards, and a Grammarly for Business admin console with SSO and brand tone profiles. If you live across many writing surfaces, Grammarly is everywhere you already are.
QuillBot integrates with Chrome (extension), Microsoft Word (add-in), Google Docs (extension), and macOS (menu bar app), with a smaller footprint than Grammarly but covering the surfaces most writers actually use. For category context on AI tooling more broadly, see our roundup of the best AI tools for creative writing. Both offer team plans, but Grammarly’s Business tier is more mature for organisations that need analytics, central billing, and brand voice enforcement.
Side-by-Side Comparison
| Feature | QuillBot | Grammarly |
|---|---|---|
| Starting price (Premium) | $8.33/mo (annual) | $12/mo (annual) |
| Free plan | Yes (125-word paraphraser, unlimited grammar) | Yes (basic grammar & tone) |
| Paraphrasing modes | 7 (Standard, Fluency, Formal, Simple, Creative, Expand, Shorten) | 1 (Rewrite, Premium only) |
| Grammar accuracy | Strong | Industry-leading |
| Summariser | Yes (1,200 words free, unlimited Premium) | No |
| Citation generator | Yes (APA, MLA, Chicago) | No |
| Plagiarism checker | Yes (20 pages/mo Premium) | Yes (Premium) |
| AI content generator | AI Co-Writer (long-form) | GrammarlyGO (prompts & replies) |
| Browser extensions | Chrome | Chrome, Safari, Edge, Firefox |
| Mobile app / keyboard | No native mobile keyboard | iOS + Android keyboards |
| Best for | Students, researchers, content writers, ESL users | Professionals, executives, multi-app writers |
Which Should You Choose
Pick QuillBot if you rewrite, paraphrase, or summarise content regularly, you’re a student or researcher who needs citation help and plagiarism checking, you write in English as a second language, or you want a full AI writing suite without paying Grammarly Premium prices.
Pick Grammarly if you write across many apps (email, Slack, docs, LinkedIn), you want the most accurate grammar engine on the market, you need brand tone enforcement for a team, or you value ambient inline suggestions over a dedicated rewrite workspace.
For most students, researchers, and content writers in 2026, QuillBot delivers more value per dollar, deeper rewrites, more tools, lower price. For knowledge workers who write across many platforms and value invisible polish, Grammarly is still the safer default.
🎯 Try QuillBot Free Today
Get unlimited grammar checks, paraphrasing, and a 1,200-word summariser on the free plan. Upgrade to Premium when you need full power.
Start with QuillBot →Frequently Asked Questions
Is QuillBot cheaper than Grammarly?
Yes. QuillBot Premium runs about $99.95/year ($8.33/month) while Grammarly Premium is $144/year ($12/month). QuillBot also bundles paraphrasing, summarising, and citation tools that Grammarly doesn’t include at any tier.
Does QuillBot have a free plan?
Yes. QuillBot Free includes unlimited grammar checking, paraphrasing of up to 125 words at a time, summarising up to 1,200 words, and access to Standard and Fluency rewrite modes. It’s enough for casual rewriting and most student work.
Is Grammarly better at grammar than QuillBot?
Marginally, yes. Grammarly’s Premium engine catches around 5 - 10% more grammar issues than QuillBot in independent tests, particularly around comma placement, parallel structure, and clarity. For most writers the difference is small; for legal or executive writing it matters.
Can QuillBot replace Grammarly?
For most writers, yes. QuillBot’s grammar checker is strong enough for daily writing, and you get paraphrasing, summarising, citation help, and an AI Co-Writer on top. If you live mainly in Gmail and Slack and need inline checks everywhere, keeping Grammarly free alongside QuillBot is a common combo.
Which is better for students?
QuillBot. Paraphrasing, summarising, citation generation, and plagiarism checking are core student needs and they’re all included on one affordable Premium plan. Grammarly handles the grammar half well but doesn’t ship the research-paper toolkit.
Does QuillBot work in Google Docs?
Yes. QuillBot has a Google Docs extension that lets you paraphrase or grammar-check selected text directly in your document. Grammarly’s Google Docs integration is more mature with inline underlines, but QuillBot’s add-on covers the essentials.
Is QuillBot’s paraphraser undetectable by AI checkers?
QuillBot’s paraphraser produces lower AI-detector flag rates than raw GPT output in informal testing, especially in Fluency and Standard modes, because it restructures human-written input rather than generating from scratch. No tool guarantees “undetectable” against the latest detectors, but QuillBot is closer than most.
Does Grammarly have a paraphraser?
Grammarly Premium added a Rewrite feature that tightens or simplifies sentences, but it’s a single mode and behaves more like a polish pass than a true paraphraser. QuillBot’s seven dedicated modes give far more control over how heavily the text is rewritten.
Can I use both tools together?
Yes, and many writers do. A common combo is Grammarly Free for ambient inline grammar in browsers and apps, plus QuillBot Premium for rewriting, summarising, and AI drafting in a dedicated workspace. It costs less than Grammarly Premium alone and covers more ground.
Does QuillBot offer a team plan?
Yes. QuillBot Teams starts at around $14.95/user/month and adds central billing, shared usage limits, and admin controls. For larger organisations Grammarly Business is more mature with SSO, brand voice profiles, and analytics dashboards.
Final Word
Grammarly built the consumer grammar checker category and still leads on rule depth and inline reach, especially for professionals who write across many apps. But QuillBot has quietly become the better daily driver for students, researchers, and content writers who do real rewriting work, more rewrite modes, more research tools, lower price. If that’s you, start with QuillBot’s free plan, run a few paragraphs through the paraphraser, and you’ll see the difference. For broader context, browse our roundups of the best AI paraphrasing tools for writers and the best AI tools for creative writing.