Grammarly vs QuillBot (2026): Which AI Writing Tool Is Better?
Both are AI-powered writing tools with tens of millions of users — but they solve different problems. Grammarly is the best tool for grammar, tone, and professional writing quality. QuillBot leads in paraphrasing, summarization, and academic research workflows. Here's the full breakdown.
Grammarly vs QuillBot: Feature Comparison
| Feature | Grammarly | QuillBot |
|---|---|---|
| Pricing (free) | Free — grammar + spelling + tone | Free — paraphraser (125 words) + summarizer |
| Pricing (paid) | Pro $12/mo (annual) | Premium $9.95/mo (annual) |
| Grammar checking | ✅ Industry-leading — catches nuanced errors | Basic — focuses on rewriting, not checking |
| Paraphrasing | Limited rewrite suggestions | ✅ Best-in-class — 8 paraphrase modes |
| Tone detection | ✅ 8 tones + audience targeting | Limited |
| Plagiarism check | ✅ Pro feature — checks 16B+ web pages | ✅ Premium feature — via iThenticate |
| AI text generation | ✅ Generative AI prompts + rewrites | ✅ AI Writer + Co-Writer mode |
| Summarizer | Basic | ✅ Summarize long docs into bullets or paragraphs |
| Citation tool | ❌ No built-in citation | ✅ Built-in citation generator (MLA, APA, Chicago) |
| Translator | ❌ | ✅ Translate in 30+ languages |
| Browser extension | ✅ Chrome, Firefox, Safari, Edge | ✅ Chrome extension |
| MS Word / Google Docs | ✅ Native add-ins for both | ✅ Google Docs extension; Word via extension |
| Team / Business plan | ✅ Business $15/mo/member — style guides, analytics | ✅ Teams $6.67/mo/member |
| Best for | Professional writers, business comms, ESL users | Students, academics, content repurposing |
Try QuillBot's paraphrasing and grammar tools yourself — free to start, no credit card needed.
In-Depth Review
Grammarly
The gold standard AI writing assistant — unmatched grammar, tone, and clarity feedback
Pros
- ✓Best grammar and spelling detection — catches subtle, complex errors
- ✓Tone detector with 8+ tones — formal, casual, confident, friendly, etc.
- ✓Audience targeting — calibrate writing for experts vs. general readers
- ✓Native MS Word and Google Docs integrations (not just extensions)
- ✓AI generative rewriting — improve clarity, shorten, or formalize any passage
- ✓Real-time inline suggestions as you type across every platform
- ✓Business plan with company style guides, brand tone settings, and team analytics
- ✓Plagiarism checker covers 16B+ web pages + ProQuest academic database
Cons
- ✗More expensive than QuillBot — Pro at $12/mo vs QuillBot Premium at $9.95/mo
- ✗Paraphrasing is more limited — doesn't offer multiple rewrite modes
- ✗No built-in citation generator for academic writing
- ✗No translation feature
- ✗Can over-correct creative writing and flag intentional stylistic choices
✍️ Verdict:
The best AI writing assistant for grammar, tone, and professional communication. It goes beyond spell-check into actual writing quality improvements that change how readers perceive your content.
Best for: Professional writers, business communicators, ESL learners, and anyone who writes formal content and needs airtight grammar + tone control
QuillBot
The leading AI paraphrasing and research tool — essential for academic writing and content repurposing
Pros
- ✓Best-in-class paraphraser with 8 modes: Standard, Fluency, Formal, Academic, Simple, Creative, Expand, Shorten
- ✓Summarizer compresses long documents into clean bullets or paragraph form
- ✓Citation generator — auto-cite in MLA, APA, Chicago, Harvard
- ✓Translator — translate and paraphrase in 30+ languages
- ✓AI Co-Writer for drafting full documents with AI assistance
- ✓More affordable than Grammarly — Premium $9.95/mo vs Grammarly Pro $12/mo
- ✓Plagiarism checker via iThenticate (academic-grade, the same database used by universities)
- ✓Better free tier for paraphrasing — 125 words free vs. Grammarly's no paraphrase on free
Cons
- ✗Grammar checking is significantly weaker than Grammarly — not its core strength
- ✗No tone detection or audience calibration features
- ✗MS Word integration is through extension, less seamless than Grammarly
- ✗Limited real-time inline suggestions while writing (more of a paste-and-edit tool)
- ✗AI writing quality sometimes produces awkward phrasing on complex topics
✍️ Verdict:
The best AI tool for paraphrasing, summarization, and academic writing workflows. QuillBot's 8 paraphrase modes and built-in citation generator make it indispensable for students and researchers that Grammarly simply can't replicate.
Best for: Students, academics, content marketers, and anyone who needs to rephrase, summarize, cite sources, or repurpose content at scale
Which Should You Choose?
FAQs
Is Grammarly or QuillBot better for students?
QuillBot is generally better for students. Its 8 paraphrase modes help rewrite source material in your own words, the built-in citation generator (MLA, APA, Chicago) saves significant time, and the summarizer condenses long academic papers. The plagiarism checker uses iThenticate, which is the same database universities use. Grammarly is better for polishing the final draft, so many students use both: QuillBot to research and rephrase, Grammarly to clean up the final paper.
Which is better for professional business writing — Grammarly or QuillBot?
Grammarly is significantly better for professional business writing. Its tone detection (formal, confident, friendly, etc.) and audience targeting features help you calibrate emails, reports, and proposals for the right reader. The Business plan lets teams set shared style guides so everyone writes consistently. QuillBot focuses on paraphrasing rather than real-time writing quality improvements that matter in professional communication.
Can I use Grammarly and QuillBot together?
Yes, and many writers do exactly this. The tools complement each other rather than compete: use QuillBot to paraphrase source material, generate citations, or summarize research; then use Grammarly to catch grammar errors, improve tone, and polish the final draft. Both integrate with Google Docs and have browser extensions, making it practical to use both in the same workflow.
Is QuillBot good for avoiding plagiarism?
QuillBot's paraphraser can help rewrite content in original phrasing, but it's not a substitute for writing original ideas. QuillBot Premium includes an actual plagiarism checker powered by iThenticate (the same service universities use) which checks your text against a massive database of academic and web content. That's the tool you want to run before submitting academic work. The paraphraser alone doesn't guarantee plagiarism-free output.
Which tool has a better free version?
It depends what you need. Grammarly's free tier offers unlimited grammar and spelling checks plus basic tone suggestions — genuinely useful for everyday writing. QuillBot's free tier gives you 125-word paraphrasing plus unlimited summarization, which is great for quick research tasks but limiting for longer content. Grammarly's free tier is more broadly useful day-to-day; QuillBot's free tier is better if you specifically need to paraphrase text.
Does QuillBot detect AI-generated text?
QuillBot does not have a built-in AI detector. Grammarly also doesn't directly offer AI detection as a core feature. If you need AI detection, dedicated tools like Originality.ai or GPTZero are purpose-built for that task. QuillBot's paraphraser can be used to rephrase AI-generated text to make it less detectable, though this is a gray area in academic settings — check your institution's policies.
Try These Tools Yourself
Both have free plans — test them side by side before committing.