Grammarly vs QuillBot: Which Writing Tool is Better in 2026?
Grammarly and QuillBot are the two most popular AI writing tools, but they solve different problems. This comprehensive comparison covers pricing, grammar checking, paraphrasing, plagiarism detection, AI features, and platform integrations to help you choose the right tool — or decide if you need both.
⚡ Quick Answer
Grammarly is the better all-around writing assistant — superior grammar checking, tone detection, plagiarism scanning, and platform integrations. QuillBot wins at paraphrasing and rewriting with 9+ modes, at a lower price point ($8.33/mo vs $12/mo annually).
Use Grammarly if you want a comprehensive writing copilot that catches errors everywhere you write. Use QuillBot if you primarily need to rephrase, restructure, or simplify existing text. Many serious writers use both.
Grammarly vs QuillBot: Side-by-Side Comparison
| Feature | Grammarly | QuillBot |
|---|---|---|
| Free Plan | Basic grammar, tone, 100 AI prompts/mo | 125-word paraphrase, 2 modes, no plagiarism |
| Paid Price (Annual) | $12/mo ($144/yr) | $8.33/mo ($99.95/yr) |
| Paid Price (Monthly) | $30/mo | $19.95/mo |
| Grammar Checking | ★★★★★ | ★★★★☆ |
| Paraphrasing | ★★★☆☆ | ★★★★★ |
| Plagiarism Detection | ✓ 16B+ pages, ProQuest | ✓ 25K words/mo limit |
| Tone Detection | ✓ Advanced | ✗ Not available |
| AI Writing/Generation | ✓ 1,000 prompts/mo | ✓ AI Chat included |
| Paraphrasing Modes | Full-sentence rewrites | 9+ modes (Formal, Creative, etc.) |
| Browser Extension | ✓ Works everywhere | ✓ Chrome only |
| AI Detector | ✗ No | ✓ Built-in |
| AI Humanizer | ✗ No | ✓ Built-in |
| Summarizer | ✗ No | ✓ Up to 6,000 words |
| Translator | ✓ Multilingual support | ✓ Dedicated translator |
| Enterprise/Team | ✓ SSO, analytics, custom | ✓ Teams from $3.75/user |
| Best For | Grammar, tone, professional writing | Paraphrasing, rewriting, students |
🎯 The Core Difference: Editor vs. Rewriter
The fundamental distinction is this: Grammarly is an editor that improves your existing writing by catching errors, adjusting tone, and polishing clarity. QuillBot is a rewriter that transforms your text into something new — different words, different structure, same meaning.
This means they are not actually competitors in the traditional sense. Grammarly answers"Is my writing correct?" while QuillBot answers "How else could I say this?" Many professional writers use both tools in sequence: QuillBot first to restructure and rephrase, then Grammarly to polish and verify.
In-Depth Comparison
💰 Pricing & Plans
Grammarly
- Free: Basic grammar, spelling, punctuation, tone detection, 100 AI prompts/month
- Pro ($12/mo annual): Advanced grammar, full-sentence rewrites, plagiarism checker, genre-specific suggestions, 1,000 AI prompts/month. $30/mo monthly, $20/mo quarterly.
- Enterprise (custom): SSO/SAML, user analytics, dedicated CSM, consolidated billing. Contact sales for pricing.
Note: Grammarly renamed Premium to "Pro" in 2025/2026. Same features, same price. The old Business plan was folded into Enterprise.
QuillBot
- Free: 125-word paraphrase limit, 2 modes (Standard & Fluency), 1,200-word summarizer, no plagiarism checker
- Premium ($8.33/mo annual): Unlimited paraphrasing, 9+ modes, 6,000-word summarizer, 25,000-word/mo plagiarism checker, AI Chat, AI Detector, AI Humanizer. $19.95/mo monthly.
- Teams ($3.75/user/mo): Everything in Premium plus admin dashboard, centralized billing, shared style guide. 2-10 members. Volume discounts for 11-50 ($3.33) and 51+ ($2.91).
QuillBot offers verified student discounts. 3-day money-back guarantee on all plans.
💡 Price comparison: QuillBot Premium saves you $44.05/year compared to Grammarly Pro ($99.95 vs $144). That's a 31% discount. However, Grammarly includes more features — so the real question is whether those extra features are worth $3.67/month to you.
✍️ Grammar Checking Accuracy
Grammar checking is Grammarly's core competency and where it clearly leads.
Grammarly (Winner)
- • Catches complex grammar issues (subject-verb agreement, dangling modifiers, comma splices) with high accuracy
- • Contextual spelling corrections — understands "their" vs "there" vs "they're" in context
- • Sentence structure analysis with clarity and conciseness suggestions
- • Tone detection identifies 40+ tones (formal, confident, friendly, concerned)
- • Genre-specific rules (academic, business, casual, technical)
- • Works inline wherever you type — browser, desktop apps, mobile
QuillBot
- • Solid basic grammar and punctuation checking
- • Good at catching common errors (spelling, basic grammar, punctuation)
- • Less reliable with complex or nuanced grammar issues
- • No tone detection — cannot tell you if your writing sounds aggressive or passive
- • No genre-specific writing rules
- • Grammar checking is secondary to its paraphrasing engine
Verdict: Grammarly wins on grammar checking by a wide margin. In multiple independent tests, Grammarly consistently catches 15-25% more errors than QuillBot, especially in complex sentences. If grammar accuracy is your primary concern, Grammarly is the clear choice.
🔄 Paraphrasing & Rewriting
Paraphrasing is QuillBot's entire reason for existing — and it shows.
Grammarly
- • Full-sentence rewrites available on Pro — suggests alternative phrasings
- • Limited to individual sentences, not paragraph-level rewriting
- • No dedicated paraphrasing modes or controls
- • Generative AI can draft new text but isn't optimized for rewriting
- • Best described as "polish" rather than "transform"
QuillBot (Winner)
- • 9+ paraphrasing modes: Standard, Fluency, Formal, Simple, Creative, Expand, Shorten, Academic, Custom
- • Unlimited word count on Premium (125 words on free)
- • Word-level control — click individual words to see synonym alternatives
- • Preserves meaning while genuinely transforming sentence structure
- • Compare Modes feature lets you see outputs from multiple modes side by side
- • Paraphraser History to track and undo changes
Verdict: QuillBot dominates paraphrasing. It's not even close. The 9+ mode system gives you precise control over how text is rewritten — from academic formality to creative flair. Grammarly's rewriting is more like"here's a slightly better way to say this" while QuillBot's is"here are 9 completely different ways to say this."
🔍 Plagiarism Detection
Grammarly (Winner)
- • Scans against ProQuest academic databases and 16+ billion web pages
- • No monthly word limit on plagiarism scans (Pro plan)
- • Highlights matching passages with source links
- • Particularly strong for academic writing due to ProQuest integration
- • Industry-trusted — used by universities and publishers
QuillBot
- • Limited to 25,000 words per month on Premium
- • Not available on the Free plan at all
- • Scans web sources but lacks ProQuest academic database access
- • Good for quick checks but insufficient for heavy academic use
- • 25K word limit = roughly 2-3 long research papers per month
Verdict: Grammarly's plagiarism checker is more comprehensive, with no word limits and access to academic databases. QuillBot's 25,000-word monthly cap is adequate for occasional use but limiting for students or researchers who write frequently.
🤖 AI Features & Tools
Both tools have invested heavily in AI, but in different directions.
Grammarly
- Generative AI: Draft emails, brainstorm ideas, compose text from prompts. 100 prompts/mo free, 1,000 prompts/mo Pro.
- Tone Adjustment: Rewrite text to sound more formal, friendly, confident, or diplomatic
- Full-Sentence Rewrites: Alternative phrasings for clarity and impact
- Smart Synonyms: Context-aware word alternatives
QuillBot
- AI Chat: Conversational AI assistant for brainstorming, Q&A, and content drafting
- AI Detector: Check if text was AI-generated — useful for educators and content managers
- AI Humanizer: Rewrite AI-generated text to sound more natural and human
- Summarizer: Condense long texts into key points (up to 6,000 words on Premium)
- Translator: Translate text between languages with unlimited characters on Premium
Verdict: This one's a draw with different strengths. Grammarly's AI is integrated into your writing workflow — it suggests improvements as you type. QuillBot's AI is a toolkit — AI Detector, Humanizer, Summarizer, and Translator are standalone utilities that serve specific needs. If you work with AI-generated content, QuillBot's Detector + Humanizer combo is uniquely valuable.
🔌 Platform Integrations
Grammarly (Winner)
- • Browser extensions: Chrome, Firefox, Safari, Edge
- • Desktop apps: Windows, macOS (system-wide)
- • Mobile keyboards: iOS, Android
- • Google Docs, Microsoft Word, Outlook
- • Gmail, Slack, LinkedIn, and most web text fields
- • Grammarly Editor (dedicated web app)
- • Works inline — suggestions appear as you type, everywhere
QuillBot
- • Browser extension: Chrome (primary), other browsers limited
- • Google Docs add-on
- • Microsoft Word add-in
- • Web app (quillbot.com)
- • No dedicated desktop app
- • No mobile keyboard app
- • Fewer inline integrations — mostly copy-paste workflow
Verdict: Grammarly's integration story is vastly superior. It literally works everywhere you write — from Slack messages to LinkedIn posts to emails. QuillBot's experience is more "tab over to quillbot.com, paste, process, copy back." For friction-free writing assistance, Grammarly wins.
🎨 User Experience & Interface
Grammarly
- • Clean, minimalist interface with underlined suggestions
- • Writing score (0-100) gives you a quick quality snapshot
- • Performance stats: word count, reading time, vocabulary level
- • Color-coded suggestion categories (correctness, clarity, engagement, delivery)
- • Set writing goals (audience, formality, domain, tone, intent)
QuillBot
- • Split-screen view: original on left, paraphrased on right
- • Synonyms slider — control how much the text changes (word fluency level)
- • Click any word to see alternative choices inline
- • Mode selector at top for quick switching between paraphrasing styles
- • Simpler interface focused on the paraphrasing workflow
Who Should Choose Which?
✅ Choose Grammarly If...
- •You write professionally — emails, reports, proposals, client communications where errors cost credibility
- •You want it everywhere — browser, desktop, mobile, Gmail, Slack, Google Docs, Word, LinkedIn
- •Tone matters — you need to sound formal in one email and friendly in the next
- •You publish academic work — the plagiarism checker with ProQuest is essential
- •You manage a team — Enterprise features, brand tone consistency, usage analytics
- •English isn't your first language — Grammarly's contextual corrections help ESL writers significantly
✅ Choose QuillBot If...
- •You need to rephrase content — essay rewording, avoiding repetition, finding better ways to say things
- •You're a student on a budget — $8.33/mo with student discounts available, plus free schools through education partnerships
- •You work with AI content — AI Detector + Humanizer lets you check and naturalize AI-generated text
- •You need text summarization — condense research papers, articles, and long documents into key points
- •You translate frequently — dedicated translator with unlimited characters on Premium
- •You have a small team — Teams plan starts at just $3.75/user/mo for 2-10 members
🤝 The Power Move: Use Both Together
Many professional writers and content teams use Grammarly and QuillBot together. Here's the optimal workflow:
Draft your content (or use AI to generate a first draft)
QuillBot: Paraphrase and restructure sections that feel clunky or repetitive
Grammarly: Run the polished text through for grammar, tone, and clarity corrections
Plagiarism check: Use Grammarly's checker on the final version before publishing
Combined annual cost: $243.95/year ($144 Grammarly Pro + $99.95 QuillBot Premium). That's about $20.33/month for a complete writing toolkit — less than a single hour of professional editing.
Real-World Scenarios
📚 College Student Writing Essays
Best choice: QuillBot Premium — $8.33/mo gets you paraphrasing for rewording citations and avoiding self-plagiarism, plus the plagiarism checker. The Academic paraphrasing mode is specifically designed for scholarly writing. Student discounts make it even cheaper.
Add Grammarly Free for basic grammar checking at no extra cost.
💼 Business Professional Writing Emails
Best choice: Grammarly Pro — tone detection ensures your emails strike the right note. The browser extension works directly in Gmail, Outlook, and LinkedIn without copy-pasting. Catches errors in real-time before you hit send.
QuillBot adds minimal value here — you rarely need to paraphrase business emails.
✏️ Content Writer / Blogger
Best choice: Both tools — QuillBot helps you rephrase sections to avoid repetition across articles. Grammarly ensures every post is polished and error-free. The combined $20/mo investment pays for itself if it saves you even 30 minutes of editing per week.
🌍 ESL / Non-Native English Writer
Best choice: Grammarly Pro — its contextual grammar corrections are specifically valuable for non-native speakers. It catches article misuse (a/an/the), preposition errors, and word order issues that QuillBot's grammar checker often misses. Tone detection helps you match the formality expected in English business communication.
🤖 AI Content Manager
Best choice: QuillBot Premium — the AI Detector checks whether content reads as AI-generated, and the AI Humanizer rewrites it to sound more natural. This workflow is essential for anyone publishing AI-assisted content that needs to pass as human-written. Grammarly doesn't offer these tools.
👥 Marketing Team (5-15 people)
Best choice: Grammarly Enterprise — brand tone consistency across all team members, usage analytics to track adoption, SSO for security, and a dedicated CSM. QuillBot Teams works for smaller teams on a budget ($3.75/user vs Grammarly's custom pricing) but lacks the governance features larger teams need.
⚠️ Hidden Costs & Gotchas
Grammarly Watch-Outs
- • Annual plans are non-refundable after 7 days. That $144 is locked in.
- • No mid-tier plan. It's Free → $12/mo (annual) or $30/mo (monthly). No $5/mo option.
- • Account sharing violates ToS. Each person needs their own license.
- • 1,000 AI prompt limit. Heavy users can hit this mid-month.
- • Enterprise pricing is opaque. No public pricing — you have to talk to sales.
QuillBot Watch-Outs
- • 125-word free limit is tiny. You'll hit it with a single paragraph, making the free tier nearly useless for real work.
- • 25K word plagiarism cap. That's about 2-3 long papers per month. Heavy users need a dedicated plagiarism tool.
- • Chrome-centric. Firefox, Safari, and Edge users get a limited experience.
- • No mobile app. No keyboard integration on iOS or Android.
- • AI Humanizer accuracy varies. It doesn't guarantee passing all AI detectors, and results depend heavily on the source text.
Worth Considering: Alternatives
If neither Grammarly nor QuillBot is the right fit, here are other writing tools to explore:
🏆 Final Verdict
Grammarly Wins At:
- ✅ Grammar accuracy (significantly better)
- ✅ Tone detection and adjustment
- ✅ Platform integrations (works everywhere)
- ✅ Plagiarism detection (ProQuest + no limits)
- ✅ Enterprise/team features
- ✅ Mobile experience (keyboard app)
- ✅ ESL and non-native English support
QuillBot Wins At:
- ✅ Paraphrasing (9+ modes, not even close)
- ✅ Price (31% cheaper annually)
- ✅ AI content detection
- ✅ AI humanizing (making AI text natural)
- ✅ Text summarization
- ✅ Translation
- ✅ Team pricing (from $3.75/user)
The bottom line: These tools are complementary, not competing. Grammarly is the best writing editor for catching errors and polishing tone. QuillBot is the best writing rewriter for restructuring and rephrasing text. Your choice depends on which problem you need solved — or whether you can afford $20/mo for both.