Grammarly vs QuillBot — Which is Better in 2026? (Honest Comparison)

Grammarly and QuillBot are the two most widely used AI writing tools in 2026. Between them they serve hundreds of millions of users. Students use them for essays. Writers use them for content. Professionals use them for emails and documents.

But they are genuinely different tools that do different things well. Choosing the wrong one means paying for features you do not need while missing the ones you do.

Here is an honest comparison of both based on real testing — not marketing copy.

What Each Tool Actually Does

Grammarly started as a grammar checker and evolved into a comprehensive writing assistant. Its core strength is identifying errors in your writing — grammar, spelling, punctuation, clarity, tone — and suggesting improvements in real time as you write.

QuillBot started as a paraphrasing tool and added more features over time. Its core strength is rewriting and transforming text — paraphrasing in multiple modes, summarizing, and humanizing AI content.

The distinction matters. If you need to write better Grammarly is built for that. If you need to rewrite or transform existing text QuillBot is built for that.

Grammar Checking: Grammarly Wins

Both tools have grammar checkers. In independent testing QuillBot identified all 20 errors in a test document while Grammarly identified 11. However Grammarly's suggestions are generally more contextually accurate — it understands writing style and intent better than QuillBot's grammar module.

For everyday grammar checking Grammarly is the better tool. It integrates into your browser and works inline in Gmail, Google Docs, LinkedIn, and thousands of other platforms. QuillBot requires you to copy-paste text into its editor.

Winner: Grammarly for grammar checking, especially for casual daily use through the browser extension.

Paraphrasing: QuillBot Wins Clearly

Grammarly does not have a dedicated paraphrasing tool. Its Premium plan offers sentence-level rewrites but these are limited to improving clarity — not transforming text into different styles or tones.

QuillBot's paraphraser offers seven modes: Standard, Fluency, Academic, Simple, Creative, Formal, and Expand. Each produces genuinely different output. The synonym slider lets you control how much the vocabulary changes. This level of paraphrasing flexibility has no equivalent in Grammarly.

Winner: QuillBot for paraphrasing — not even close.

AI Detection: Both Are Limited

Both tools include AI detection features. QuillBot's free AI detector has improved significantly in 2026 and correctly identified AI-generated content in testing. Grammarly's AI detection features require Premium.

Neither tool is as specialized for AI detection as dedicated detectors like GPTZero or Textora's free AI detector which gives a sentence-by- sentence breakdown of exactly which parts score highest for AI patterns.

Try Free AI Detector →

Winner: Tie — both adequate but neither excellent for serious AI detection needs.

Plagiarism Checking: Grammarly Wins

Grammarly's plagiarism checker is one of its strongest features. It checks text against billions of web pages and academic papers and provides detailed source attribution.

QuillBot's plagiarism checker exists but tests have shown it misses significant amounts of copied content. For serious plagiarism checking — particularly for academic work — Grammarly is the better option.

Winner: Grammarly — significantly better plagiarism detection.

Pricing: QuillBot is Cheaper

Grammarly:

• Free: Basic grammar and spelling
• Premium: $12/month (billed annually) — $144/year
• Business: $15/month per member

QuillBot:

• Free: Limited paraphrasing (125 words), basic grammar
• Premium: $8.33/month (billed annually) — $100/year
• Teams: Starting at $7.50/user/month

QuillBot is about 30% cheaper for equivalent access. Both have significant free tier limitations that push users toward paid plans.

Winner: QuillBot on price.

Browser Integration: Grammarly Wins

Grammarly's browser extension works across 500,000+ applications and websites. It runs inline in Gmail, Google Docs, Microsoft Word, LinkedIn, Twitter, Slack — everywhere you type.

QuillBot has a Chrome extension and Word integration but coverage is significantly narrower. For people who write across many platforms Grammarly's integration is genuinely valuable.

Winner: Grammarly for integration.

Grammarly vs QuillBot: Side by Side

Feature	Grammarly Free	Grammarly Premium	QuillBot Free	QuillBot Premium
Grammar check	Basic	Advanced	Basic	Advanced
Paraphrasing	❌	Limited	125 words	Unlimited
Plagiarism check	❌	✅	❌	✅
AI detection	❌	✅	✅ Free	✅
Browser extension	✅	✅	Limited	Limited
Word limit	None	None	125 words	None
Sign up required	Yes	Yes	Yes	Yes
Price	Free	$144/yr	Free	$100/yr

Who Should Use Grammarly

Grammarly is the better choice if you:

• Write across many platforms and want inline suggestions everywhere
• Need reliable plagiarism checking
• Want detailed style and tone improvement suggestions
• Write professionally and need consistent quality across documents

Who Should Use QuillBot

QuillBot is the better choice if you:

• Frequently need to paraphrase or rewrite text
• Want more affordable AI writing assistance
• Are a student who needs paraphrasing for academic work
• Need to transform AI-generated text into different styles

The Free Alternative Neither Mentions

Both Grammarly and QuillBot have significant limitations on their free plans. Grammarly's free tier misses most advanced corrections. QuillBot's free tier limits paraphrasing to 125 words.

For users who want free tools with no word limits and no account required Textora offers genuine alternatives to both:

Free Grammar Checker — catches grammar, spelling, and punctuation errors with plain English explanations for every correction. No sign up, no word limits.

Try Free Grammar Checker →

Free Paraphraser — five modes (Standard, Fluency, Creative, Formal, Simple) with no word limits. More modes than QuillBot's free tier.

Try Free Paraphraser →

Free AI Detector — sentence-by- sentence breakdown with human and AI scores. No account required.

Try Free AI Detector →

All completely free. No sign up. No word limits.

Frequently Asked Questions

Is Grammarly better than QuillBot for students? For grammar checking and plagiarism detection Grammarly is better. For paraphrasing academic sources QuillBot is better. Many students use both together.

Does QuillBot replace Grammarly? Not fully. They do different things well. QuillBot excels at paraphrasing. Grammarly excels at grammar checking and writing quality improvement. They complement rather than replace each other.

Which is better for academic writing? Grammarly for grammar and clarity. QuillBot for paraphrasing sources. For AI humanizing Textora's free AI humanizer specifically addresses academic writing.

Can I use both Grammarly and QuillBot for free? Yes. Both have free tiers with limitations. Grammarly free covers basic grammar. QuillBot free covers limited paraphrasing. Both require sign up.

Is there a free tool that does what both do? Textora covers grammar checking, paraphrasing, AI detection, and AI humanizing — all completely free with no sign up required.

Conclusion

Grammarly and QuillBot are both genuinely good tools that serve different primary needs. If you write across many platforms and need inline grammar correction Grammarly is worth its price. If you need powerful paraphrasing on a budget QuillBot is the better value.

For users who need both capabilities but cannot justify paying $100-144 per year for either Textora provides the core features of both — grammar checking and paraphrasing — completely free with no account and no word limits.

Try All Tools Free →