Quillbot vs Grammarly 2026: Which AI Writing Tool Actually Makes Your Writing Better?
Two different philosophies: Grammarly corrects errors in your writing. Quillbot rewrites your writing entirely. Here’s when to use each — and why most writers need both.
Quick Verdict
For grammar and professional polish: Grammarly. For paraphrasing, summarizing, and restructuring: Quillbot. They’re more complementary than competing — many writers subscribe to both.
Core Feature Comparison
| Feature | Grammarly | Quillbot | Winner |
|---|---|---|---|
| Primary function | Grammar & style correction | Paraphrasing & rewriting | Different tools |
| Grammar correction | Excellent (industry-leading) | Basic | Grammarly |
| Paraphrasing modes | None | 8 modes (Standard, Fluency, Formal, etc.) | Quillbot |
| Plagiarism checker | Yes (Premium) | Yes (Premium) | Tie |
| Browser extension | Excellent (all sites) | Good (limited sites) | Grammarly |
| Google Docs integration | Native, real-time | Available | Grammarly |
| Word integration | Native add-in | Available | Grammarly |
| Tone detection | Yes (multiple tone labels) | Limited | Grammarly |
| Free plan limits | Basic grammar only | 125 words/paraphrase | Quillbot (more useful free) |
| Price (annual) | ~$144/yr ($12/mo) | ~$100/yr ($8.33/mo) | Quillbot (cheaper) |
| Best for | Professionals, students, anyone publishing | Researchers, content teams, ESL writers | Depends on use case |
What Grammarly does that Quillbot can’t
- Real-time grammar and spelling correction as you type across every website and app
- Style suggestions that improve clarity, conciseness, and readability beyond grammar
- Tone detection that flags when your email sounds unintentionally harsh or overly formal
- Consistency checks (capitalization, punctuation style) across long documents
- Writing goals that tailor suggestions to your audience, domain, and intent
What Quillbot does that Grammarly can’t
- Rewrite entire paragraphs in 8 different modes (Standard, Fluency, Formal, Academic, Creative, etc.)
- Summarize long articles or documents into key points in seconds
- Rephrase sentences to avoid repetition or match a specific register
- Help ESL writers find more natural-sounding English alternatives
- Grammar checking that catches issues introduced during paraphrasing
When to Use Each Tool
| Task | Use Grammarly | Use Quillbot |
|---|---|---|
| Final proofread before sending | Yes | No |
| Rephrase a sentence 5 different ways | No | Yes |
| Improve email tone before sending | Yes | No |
| Summarize a 5,000-word article | No | Yes |
| Fix grammar while writing a blog post | Yes | No |
| Rewrite a paragraph in academic style | No | Yes |
Price Comparison: Free vs Premium
| Tier | Grammarly | Quillbot |
|---|---|---|
| Free | Basic grammar, limited style fixes | 125 words per paraphrase, 3 paraphrase modes |
| Premium (monthly) | $30/mo | $19.95/mo |
| Premium (annual) | ~$144/yr ($12/mo) | ~$100/yr ($8.33/mo) |
| Best free tier for? | Basic proofreading | Occasional paraphrasing |
Our Verdict
Choose Grammarly if you publish content regularly, write professional emails, or need consistent grammar correction integrated everywhere you write. The browser extension alone is worth the price for anyone who writes online.
Choose Quillbot if you need to rephrase, summarize, or restructure content — particularly researchers, ESL writers, content marketers working from source material, or anyone who needs to express the same idea multiple ways.
Use both if you’re a serious writer or content professional. The combined cost ($244/yr) is less than most SaaS tools and covers the full writing workflow: Grammarly catches errors, Quillbot handles restructuring and variation.