Quillbot and Grammarly are two leading AI-powered writing tools, but which one actually improves your writing the most?
I’ve spent over 100 hours testing both tools across real writing tasks to bring you a straightforward recommendation.
After putting them head-to-head, Grammarly came out on top for polishing and correcting writing in real time — ideal for professionals, students, and anyone writing for clarity.
Quillbot vs Grammarly: Quick Verdict
Grammarly – Best overall, ideal for professional and academic writing
Quillbot – Best for rewriting content or paraphrasing quickly
In this review, I’ll walk you through how both tools performed across core categories like features, pricing, AI capabilities, and user experience.
Quick Comparison: Quillbot vs Grammarly
Take a look at this clear side-by-side breakdown of how Quillbot and Grammarly compare:
| Category | Quillbot | Grammarly |
|---|---|---|
| Best For | Rewriting and paraphrasing | Grammar, clarity, and tone |
| Free Plan | Yes, with limits | Yes, strong features included |
| Premium Cost (Annual) | $79.95/year | $144/year |
| AI Writing Generator | Basic tools | GrammarlyGO (advanced AI writing) |
| Plagiarism Checker | Premium only | Premium only |
| Grammar Checker | Basic | Industry-leading |
| Tone Detection | No | Yes |
| Summarizer | Yes | No |
| Supported Formats | Web editor, extensions | Browser, apps, integrations |
Best for Pricing: Quillbot
If budget is your priority, Quillbot is the more affordable option.
Quillbot’s pricing starts at $19.95/month, or just $79.95/year. That gives you access to all its rewriting modes, unlimited paraphrasing, summarizer tools, and plagiarism checks.
Grammarly’s Premium plan is $30/month or $144/year. While more expensive, it includes advanced grammar suggestions, tone detection, and access to GrammarlyGO for AI-generated content.
Here’s a quick look at the plans:
Quillbot Pricing:
- Monthly: $19.95
- Semi-Annual: $59.95
- Annual: $79.95
- Free Plan: Includes limited paraphrasing modes and word count caps
Grammarly Pricing:
- Monthly: $30.00
- Quarterly: $60.00
- Annual: $144.00
- Free Plan: Includes grammar, punctuation, and spelling suggestions
If you’re a student or content creator looking for a budget-friendly option to rework and simplify writing, Quillbot delivers strong value.
Best for Accuracy and Real-Time Suggestions: Grammarly
Grammarly leads the way in accuracy. It doesn’t just point out mistakes — it offers real-time, AI-backed suggestions that are often spot-on.
When I used Grammarly on blog content and emails, it helped:
- Catch subtle grammar mistakes
- Refine the tone (e.g. more confident or more polite)
- Simplify complex sentences
- Improve clarity without changing intent
Grammarly’s contextual suggestions were especially helpful with longer documents. It doesn’t just fix grammar — it explains why the edit improves your sentence.
Quillbot, on the other hand, is focused on rephrasing, not grammar.
Its grammar checker is functional but not as accurate or intelligent as Grammarly’s.
Key Difference:
- Grammarly is ideal for editing and improving what you’ve written
- Quillbot is better when you need to say the same thing differently
If you’re a content writer, editor, or professional dealing with emails or reports — Grammarly is the more dependable option.
Best for Paraphrasing and Rewriting: Quillbot
If you need to rewrite content — for SEO, clarity, or originality — Quillbot is the winner here.
Quillbot’s paraphrasing tool is its core feature, and it includes seven different writing modes:
- Standard – Balanced editing
- Fluency – Focused on grammatical corrections
- Formal – For academic/professional tone
- Simple – Simplifies complex text
- Creative – Adds variety and flair
- Expand – Lengthens the content
- Shorten – Makes writing more concise
There’s also a custom mode that lets you fine-tune how aggressive the rewriting should be.
Grammarly does offer rewriting suggestions via GrammarlyGO, but these are often more generic and limited in control.
It’s more useful for generating content, not rewriting it.
Best Use Cases for Quillbot:
- SEO rewriting for content marketers
- Rewording academic essays to reduce similarity
- Repurposing blog posts into social media captions
- Summarizing research or long articles
For those writing at scale and needing fast variations of the same content, Quillbot is a solid, time-saving choice.
Best for Grammar and Tone: Grammarly
Grammarly excels when it comes to writing accuracy, tone adjustment, and clarity.
During my tests, I used it to clean up:
- Blog intros and conclusions
- Client emails
- LinkedIn posts
- Long-form guides
It picked up on things Quillbot missed — such as tense inconsistency, misplaced modifiers, and overly wordy phrasing.
Grammarly also breaks down suggestions by category:
- Correctness: Grammar, punctuation, spelling
- Clarity: Sentence structure and simplicity
- Engagement: Word variety and tone
- Delivery: Formality, confidence, tone
With the tone detector, Grammarly can tell if your message sounds angry, confused, professional, or casual — and gives tailored advice to adjust it.
Quillbot doesn’t have tone feedback. You can switch between tones using modes, but it doesn’t analyze tone in context.
If your job involves communication, editing, or publishing — Grammarly will help you sound more polished and intentional.
AI Writing Capabilities: GrammarlyGO vs Quillbot Co-Writer
Both tools now offer AI content generation — but the experience is different.
GrammarlyGO is Grammarly’s built-in AI writing assistant. It can help you:
- Write emails from scratch
- Rewrite paragraphs for clarity or tone
- Suggest outlines for reports
- Generate social media captions or intros
Quillbot’s Co-Writer, on the other hand, combines its existing tools in one place — paraphraser, summarizer, grammar checker, research tools, and writing assistant.
While it’s a helpful writing space, it’s not as sophisticated as GrammarlyGO.
Comparison:
| AI Writing Tool | GrammarlyGO | Quillbot Co-Writer |
|---|---|---|
| AI Chat Capabilities | Yes | Limited |
| AI Rewrite Suggestions | Strong | Basic |
| Integration | Built into all Grammarly apps | Web-based only |
| Best For | Drafting and rewriting | Research and editing workflow |
If you’re looking for a complete writing assistant, GrammarlyGO is more responsive, intuitive, and useful.
User Experience and Interface: Grammarly Wins
Both tools are easy to use, but Grammarly stands out for its seamless integrations.
Grammarly:
- Works across Gmail, Google Docs, WordPress, Slack, and more
- Web app is fast and intuitive
- Desktop and mobile apps available
- Great onboarding with clear feature guidance
Quillbot:
- Simple web interface with side-by-side rephrasing
- Browser extension supports Chrome and Docs
- Co-Writer is slightly clunky, with occasional lags
If you’re someone who writes in multiple places — browser, email, documents — Grammarly is better suited for multitasking.
Its integrations work quietly in the background and don’t disrupt your flow.
I found Grammarly’s design more intuitive overall. While Quillbot is clean and simple, Grammarly’s consistency across different apps makes it easier to rely on daily, especially for professional workflows.
Plagiarism Checker: Grammarly Wins
Both tools offer plagiarism detection — but only in their premium versions.
Grammarly Plagiarism:
- Scans your text against billions of web pages
- Gives a full breakdown of matching sources
- Includes citation suggestions
Quillbot Plagiarism Checker:
- Available via Co-Writer or standalone
- Decent for short academic content
- Doesn’t catch as much as Grammarly’s
If you’re publishing content online or submitting academic papers, Grammarly’s tool is more reliable and thorough.
The difference in coverage is noticeable. Grammarly’s plagiarism engine flagged results Quillbot missed entirely — especially with paraphrased or slightly modified content, which matters when originality is a concern.
Overall Winner: Grammarly
Here’s how the two stack up at the end of testing:
| Category | Winner |
|---|---|
| Grammar Checking | Grammarly |
| Paraphrasing and Rewriting | Quillbot |
| Tone Suggestions | Grammarly |
| AI Writing Capabilities | GrammarlyGO |
| Pricing | Quillbot |
| User Interface | Grammarly |
| Plagiarism Detection | Grammarly |
Grammarly is the better overall writing assistant — especially for professionals, academics, and marketers. It’s more comprehensive, more accurate, and easier to use in day-to-day writing.
Quillbot, while more limited, is a powerful tool for rewriting and rephrasing. If that’s your main task — it’s worth the lower price.
Final Recommendation
Use Grammarly if:
- You write emails, reports, or blog content regularly
- You need tone, grammar, and clarity corrections
- You want an all-in-one assistant that works everywhere
Use Quillbot if:
- You rewrite content for SEO or academic purposes
- You’re working with long articles or research papers
- You want a budget-friendly paraphrasing solution
Or, do what I do — use both. Draft with Quillbot. Polish with Grammarly.
This combo gives you the best of both worlds: speed and structure. Quillbot helps you rework ideas fast without getting stuck on phrasing, while Grammarly makes sure everything reads clearly and professionally.
It’s an efficient workflow that’s saved me hours — and made my writing sharper across the board.
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