Grammarly vs QuillBot 2026: Which Writing Tool Is Better?

TL;DR: Grammarly is the best tool for grammar checking, style improvement, and comprehensive writing assistance. QuillBot excels at paraphrasing, summarizing, and content transformation. They serve different core needs — Grammarly makes your writing better; QuillBot helps you rewrite and repurpose existing content.

Quick Comparison

Feature	Grammarly	QuillBot
Primary Strength	Grammar & style correction	Paraphrasing & rewriting
Free Plan	Yes (basic)	Yes (limited)
Paid Plan	Premium ~$30/mo	Premium ~$10/mo
Grammar Check	Excellent	Good
Paraphrasing	Basic	Excellent
Summarization	Limited	Yes
AI Writing	GrammarlyGO	AI Writer
Plagiarism Check	Yes (Premium)	Yes (Premium)
Browser Extension	Yes	Yes
Best For	ESL learners, professionals	Students, content creators

What Is Grammarly?

Grammarly is an AI-powered writing assistant that has become the de facto standard for English language correction and improvement. Founded in 2009, it now has over 50 million daily active users, ranging from students and ESL learners to business professionals and content writers.

Grammarly works across virtually every platform where you write: browser extension (Chrome, Firefox, Safari, Edge), desktop app (Windows and Mac), Microsoft Office integration, Google Docs integration, and mobile keyboard. This ubiquity is one of Grammarly's biggest advantages — it follows you wherever you write.

The core service catches grammar and spelling errors, but the real value of Grammarly Premium is its style, tone, clarity, and engagement suggestions. It doesn't just fix mistakes — it helps you write more effectively.

What Is QuillBot?

QuillBot is an AI writing tool focused primarily on paraphrasing, summarizing, and content transformation. Founded in 2017, it's particularly popular among students and content creators who need to rephrase existing content, avoid plagiarism, or quickly summarize long texts.

QuillBot's paraphrasing tool is its flagship feature, offering multiple modes (Standard, Fluency, Formal, Academic, Simple, Creative, Expand, Shorten) to transform text in different ways. The results are often surprisingly good, producing output that reads naturally rather than robotically rephrased.

At roughly $10/month for the Premium plan, QuillBot is significantly cheaper than Grammarly, making it popular with budget-conscious students and writers.

Pricing

Plan	Grammarly	QuillBot
Free	Basic grammar/spelling	Limited paraphrasing (125 words)
Premium/Paid	~$30/mo (or ~$12/mo annual)	~$10/mo (or ~$4.17/mo annual)
Business	$25/user/mo (3+ users)	Teams plan available

QuillBot is notably more affordable. At roughly $10/month vs Grammarly's $30/month, QuillBot costs about one-third the price. For students on a tight budget, this difference is significant. Annual plans for both tools dramatically reduce the monthly cost.

Grammar & Spell Checking: Grammarly Wins

Grammar checking is Grammarly's core competency, and it excels. Grammarly catches an impressive range of issues:

• Basic spelling and typos
• Subject-verb agreement errors
• Comma splices and punctuation mistakes
• Incorrect word usage (their/there/they're, affect/effect)
• Sentence fragments and run-ons
• Dangling modifiers
• Style issues (passive voice overuse, wordiness, unclear references)

QuillBot also offers grammar checking but it's a secondary feature, less comprehensive than Grammarly's. For users who primarily need to ensure their writing is grammatically correct, Grammarly is the clear choice.

Paraphrasing & Rewriting: QuillBot Wins

For paraphrasing, QuillBot is unambiguously better. This is what the tool was built for, and it shows. QuillBot's paraphrasing engine can:

• Rephrase entire paragraphs while preserving meaning
• Switch between formality levels (Formal, Casual, Academic)
• Expand or condense text length as needed
• Simplify complex language for different audiences
• Suggest alternative word choices inline

Grammarly has added paraphrasing capabilities through GrammarlyGO, but they're not as refined or versatile as QuillBot's core paraphrasing engine. For content transformation tasks, QuillBot remains the specialist choice.

AI Writing Features

GrammarlyGO is Grammarly's generative AI feature. It can generate text from prompts, rewrite selected passages, adjust tone, and create email replies. It's integrated throughout the writing process and benefits from Grammarly's deep understanding of writing quality. For users who want AI writing assistance alongside grammar checking, GrammarlyGO is convenient but not as powerful as dedicated AI writing tools.

QuillBot's AI Writer offers essay generation, summarization, and paraphrasing. Its strength is the integration between AI generation and its paraphrasing tools — you can generate content and then refine it through the paraphraser in a seamless workflow.

Plagiarism Detection

Both tools offer plagiarism checking as a Premium feature. Grammarly's plagiarism checker compares text against over 16 billion web pages and academic databases. QuillBot's plagiarism checker also offers comprehensive coverage. Both are adequate for most use cases — academic papers, blog content, marketing copy.

Neither tool is a substitute for dedicated academic integrity tools like Turnitin for formal academic submission, but for personal use and professional content creation, both are sufficient.

Ease of Use

Both tools are user-friendly, but in different ways. Grammarly's greatest usability advantage is its integration — it appears wherever you're writing without requiring you to copy-paste text into a separate tool. The browser extension and native integrations make Grammarly nearly invisible in your workflow.

QuillBot is typically used as a standalone tool where you paste text in, work with it, and copy the result out. This creates slightly more friction but also gives you more explicit control over the transformation. Its interface is clean and intuitive for the tasks it's designed for.

Who Should Choose What?

Choose Grammarly if you:

• Write professionally and need reliable grammar/style correction
• Are an ESL/EFL learner wanting to improve English writing quality
• Need a tool that works seamlessly across all your writing platforms
• Want tone and clarity feedback, not just error correction
• Work in business communications (email, documents, reports)

Choose QuillBot if you:

• Need to rephrase or rewrite existing content frequently
• Are a student who needs to paraphrase for assignments
• Want to summarize long documents quickly
• Are budget-conscious and want capable AI writing tools at lower cost
• Create content at scale and need efficient rewriting tools

FAQs

Can I use both Grammarly and QuillBot together?

Yes — in fact, this is a popular combination. Many writers use QuillBot to paraphrase or restructure content, then run it through Grammarly to catch any grammar or style issues introduced in the paraphrasing. The tools complement each other well.

Does Grammarly detect AI-written content?

Grammarly added an AI detection feature, but its accuracy is limited and contested. It can flag some AI-generated content but also produces false positives (flagging human-written text as AI). Don't rely on Grammarly's AI detector for definitive conclusions about content authorship.

Is QuillBot cheating?

QuillBot is a tool, and whether using it constitutes academic dishonesty depends on your institution's policies and how you use it. Using it to understand and rephrase material you've researched yourself is different from using it to disguise plagiarism. Check your institution's academic integrity guidelines before using paraphrasing tools for academic submissions.

Is Grammarly worth the premium price?

For professionals, business writers, and ESL learners who write frequently, yes. The style, tone, and clarity suggestions in Grammarly Premium meaningfully improve writing quality beyond just catching errors. For casual writers who mainly need spelling and basic grammar, the free version may be sufficient.

Does QuillBot work for academic papers?

QuillBot's Academic paraphrasing mode is designed for academic writing and can help rephrase content in appropriately scholarly language. However, paraphrasing tools should never be used to disguise plagiarism in academic work. Use them to improve your own writing, not to copy others' work with changed wording.

Which tool is better for non-native English speakers?

Grammarly is generally better for non-native English speakers who want to improve their writing skills. Its explanations of why something is wrong help learners understand the rules, not just fix individual mistakes. QuillBot's ability to produce fluent paraphrases can also be helpful for understanding how ideas can be expressed more naturally in English.