If you’ve ever typed a sentence and second-guessed every word, you’re not alone. Millions of writers — students, bloggers, marketers, and professionals — turn to AI writing tools to sharpen their work. Two names dominate that space: QuillBot and Grammarly.

But here’s the thing: they’re not really the same tool. One is a precision editor. The other is a content transformer. Choosing the wrong one for your workflow can waste time, money, and creative energy.

This guide breaks down everything — features, pricing, accuracy, use cases, and who should use which — so you can make a smart decision.

Quick Verdict: QuillBot vs Grammarly at a Glance

Feature	Grammarly	QuillBot
Grammar Checking	⭐⭐⭐⭐⭐ Best-in-class	⭐⭐⭐⭐ Solid
Paraphrasing	⭐⭐⭐ Limited	⭐⭐⭐⭐⭐ Industry leader
AI Writing/Generation	✅ GrammarlyGO	✅ Built-in AI
Plagiarism Checker	✅ Robust, academic DBs	✅ Available (Premium)
AI Humanizer	❌ Not available	✅ New
Multilingual Support	❌ English only	✅ 45+ languages
Free Plan	✅ Basic grammar	✅ Paraphrasing + grammar
Starting Price (Annual)	$12/month	$8.33/month
Best For	Professionals, academics	Students, content creators

What Is Grammarly?

Grammarly launched in 2009 as a grammar checker and has since evolved into a comprehensive AI writing assistant. Today, it’s used by over 30 million people worldwide and integrates with more than 500,000 applications — from Google Docs and Microsoft Word to Slack, Gmail, and LinkedIn.

Its core purpose is real-time writing improvement: catching errors as you type, suggesting better word choices, adjusting tone, and ensuring your writing is clear, confident, and professional.

Today, Grammarly has doubled down on its enterprise features. With GrammarlyGO, users can generate drafts, rewrite sentences, and even receive tone-adjusted suggestions for workplace communication. Its SOC 2 Type 2 security certification makes it a trusted choice for businesses handling sensitive documents.

Grammarly is best described as: an always-on writing coach that helps you write better, not just differently.

What Is QuillBot?

QuillBot was founded in 2017 with a singular focus: paraphrasing. It began as a tool to help students rephrase sentences without changing meaning, and over time it has grown into a full-featured writing suite trusted by over 35 million users.

Today, QuillBot’s toolkit includes a paraphraser with 9 different rewriting modes, a grammar checker, summarizer, plagiarism detector, citation generator, PDF editor, and a brand-new AI Humanizer — a feature that makes AI-generated content sound more natural and human-written.

QuillBot is best described as: a content transformation engine that rewrites, summarizes, and humanizes text.

Feature-by-Feature Comparison

1. Grammar Checking

Grammar checking is where Grammarly has built its reputation — and it still leads.

Grammarly doesn’t just flag errors; it explains why a change is needed and offers contextual suggestions based on the type of document you’re writing (academic, business, casual). It catches spelling mistakes, punctuation errors, sentence structure problems, clarity issues, and tonal inconsistencies all in one pass.

QuillBot’s grammar checker has improved significantly and in independent tests, it matches Grammarly on catching common errors — catching around 8 errors in a 100-word test document in one side-by-side evaluation. However, its explanations are less detailed, and it doesn’t offer the same depth of style guidance.

Winner: Grammarly — for depth of feedback and educational value.

2. Paraphrasing

This is QuillBot’s home turf, and nothing comes close.

QuillBot offers 9 paraphrasing modes: Standard, Fluency, Formal, Academic, Creative, Expand, Shorten, Simple, and Custom. Each mode transforms your text differently — Formal mode rewrites for professional contexts, Creative mode introduces more variation, and Fluency mode focuses on readability without dramatic changes.

You can also use the “Freeze Words” feature to lock specific technical terms, scientific names, or brand words so QuillBot doesn’t alter them during paraphrasing.

Grammarly does offer rewriting via GrammarlyGO, but these suggestions are more generic and limited in control. You don’t get the fine-tuned mode selection that QuillBot provides.

Winner: QuillBot — by a wide margin.

3. AI Humanizer (QuillBot Exclusive)

One of the most talked-about new features is QuillBot’s AI Humanizer. This tool takes AI-generated content (from ChatGPT, Claude, or any other AI) and rewrites it to sound more natural — varying sentence lengths, adjusting word patterns, and reducing the robotic consistency that AI detectors flag.

For students, bloggers, and content marketers working with AI drafts, this is a major time-saver. Grammarly has no equivalent feature.

Winner: QuillBot — this feature alone justifies the subscription for many users.

4. Plagiarism Detection

Both tools offer plagiarism checking, but they differ in scope.

Grammarly’s plagiarism checker compares your text against billions of web pages and academic databases. It highlights matched text and provides source links, making it suitable for academic submissions and professional content.

QuillBot’s plagiarism checker is functional and available on its Premium plan, but Grammarly’s is generally considered more robust with broader database access and no word count restrictions.

Winner: Grammarly — especially for academic and professional use cases.

5. Summarizer

QuillBot’s Summarizer is one of its most underrated features. Paste in a lengthy article or research paper, and it condenses the key points into either a bulleted list or a single paragraph. This is incredibly useful for students doing research or professionals who need to digest long documents quickly.

Grammarly does not offer a summarizer feature.

Winner: QuillBot — no contest.

6. Language Support

This is a significant differentiator. Grammarly supports English only (in American, British, Canadian, Australian, and Indian variants). If you write in multiple languages or for an international audience, Grammarly falls short.

QuillBot supports 45+ languages for translation and its grammar checker works in English, German, French, Spanish, and Portuguese. Its paraphraser currently operates in over 25 languages.

Winner: QuillBot — essential for non-English writers.

7. Integrations

Grammarly’s browser extension and desktop app integrate seamlessly with virtually every writing platform — Gmail, Google Docs, Microsoft Word, Outlook, Slack, LinkedIn, and 500,000+ other apps. This is one of its strongest selling points for professionals.

QuillBot’s integrations are growing but currently more limited. It integrates well with Google Docs and Chrome, but doesn’t match Grammarly’s breadth.

Winner: Grammarly — especially for teams and enterprise users.

8. AI Content Generation

Both tools offer AI text generation, but with important differences.

GrammarlyGO lets you draft emails, improve tone, rewrite paragraphs, and generate text from prompts. Free accounts get 100 AI prompts per month, while Premium accounts receive 1,000 prompts monthly.

QuillBot’s AI generation is more generous — free accounts get 50 prompts per day (roughly 1,500/month), while Premium users get unlimited access. As QuillBot’s own blog notes, even their free plan offers more generative AI access than Grammarly’s paid plan.

Winner: QuillBot — better value on AI generation, even at the free tier.

Pricing Comparison

QuillBot Pricing

• Free: Paraphrasing (limited to 125 words), grammar checker, summarizer (limited)
• Premium: ~$8.33/month (billed annually) — full paraphrasing in all modes, unlimited AI use, plagiarism checker, citation generator, and AI Humanizer

Grammarly Pricing

• Free: Basic grammar and spelling correction, limited tone suggestions
• Pro (formerly Premium): $12/month (billed annually) — advanced grammar, tone detection, GrammarlyGO, plagiarism checker
• Business/Enterprise: Custom pricing with team features

Bottom line: QuillBot is approximately 31% cheaper than Grammarly on annual plans. For students and budget-conscious users, this is a meaningful difference. For professionals who rely on deep grammar coaching and enterprise integrations, Grammarly’s higher price is often justified.

Who Should Use Grammarly?

Grammarly is the right choice if:

• You’re a professional, executive, or business writer who needs polished, error-free communication
• You write emails, reports, or presentations where tone and clarity are critical
• You work in a team environment and need consistent brand voice across departments
• You write exclusively in English and want the most accurate real-time grammar feedback
• You need enterprise-grade security (SOC 2 Type 2) for sensitive documents
• You want a tool that teaches you to write better, not just fixes your mistakes

Who Should Use QuillBot?

QuillBot is the right choice if:

• You’re a student or academic researcher who frequently needs to paraphrase source material or avoid accidental plagiarism
• You work with AI-generated content and need to humanize it before publishing
• You write in multiple languages or for international audiences
• You’re a content creator or blogger who repurposes content regularly
• You need a summarizer to process long documents quickly
• You’re on a tight budget and need strong core writing tools at a lower price
• You want a citation generator for academic papers

Can You Use Both?

Absolutely — and many writers do. A common workflow among content professionals:

1. Draft with AI or write freely
2. Paraphrase and humanize with QuillBot to reshape ideas and improve flow
3. Polish and proofread with Grammarly to catch any remaining errors and refine tone

This two-step process combines QuillBot’s transformation abilities with Grammarly’s precision editing. The total cost of both Premium plans runs around $20/month — a worthwhile investment for high-volume writers.

💡 Pro Tip: Save money on both tools by grabbing group-buy access at Toolspit.com — premium features at a fraction of the cost.

Final Verdict

Grammarly is the better tool for writing correction, professional polish, and enterprise use. Its grammar engine is more sophisticated, its explanations more instructive, and its integrations more extensive. If you write in English and care about the quality of every word, Grammarly is worth the premium.

QuillBot is the better tool for content transformation, academic writing, and budget-conscious users. Its paraphrasing capabilities are unmatched, the AI Humanizer is genuinely useful, and the multilingual support opens doors Grammarly can’t. At $8.33/month, it’s exceptional value.

The honest answer? They’re not really competing for the same job. Choose Grammarly to write better. Choose QuillBot to write differently. If your budget allows, use both — they complement each other more than they compete.

Frequently Asked Questions

Is QuillBot or Grammarly better for students? QuillBot is generally better for students due to its lower price, strong paraphrasing tools, citation generator, and summarizer. Grammarly’s free tier works well for final grammar checks.

Does QuillBot check grammar as well as Grammarly? Grammarly is more accurate and provides more detailed grammar feedback. QuillBot’s grammar checker is solid for basic correction but lacks Grammarly’s depth of contextual suggestions.

Can QuillBot bypass AI detection? QuillBot’s AI Humanizer is designed to make AI-written text sound more natural, which can reduce AI detection scores. However, no tool guarantees 100% evasion of AI detectors like Turnitin.

Which is better for SEO content writing? Both tools serve SEO writers well. QuillBot helps repurpose and spin content into fresh variations; Grammarly ensures readability and professional quality. Many SEO writers use both.

Is there a free version of both tools? Yes. Both offer free plans. Grammarly’s free tier focuses on grammar and spelling. QuillBot’s free tier includes paraphrasing (with a 125-word limit) and a grammar checker.

Which tool is better for non-English writers? QuillBot, without question. It supports 45+ languages for translation and multiple languages for grammar checking. Grammarly is English-only.