Grammarly vs QuillBot 2026: Which Writing Tool Wins?

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I had a friend who used both Grammarly and QuillBot at the same time for months — and kept paying for both because he could not figure out which one to drop. That is the honest problem with this comparison. These two tools look like they do the same thing. They do not.

After testing both extensively — on real blog posts, emails, client reports, and social media captions — I can tell you exactly what each tool is actually good for, where each one falls short, and which one deserves your money in 2026. No fluff, no fence-sitting. If you are a freelancer looking for the full picture on AI writing tools, our guide to the best AI tools for freelancers covers everything you need in one place.

Table of Contents

• The Core Difference — Understand This First
• What is Grammarly?
• What is QuillBot?
• Grammar Checking
• Paraphrasing and Rewriting
• Plagiarism Checking
• Pricing Comparison
• Free Version — What You Actually Get
• Pros and Cons
• Who Should Use Which?
• Final Verdict
• FAQ

The Core Difference — Understand This First

This one sentence will save you a lot of confusion:

Grammarly fixes YOUR writing.
QuillBot rewrites YOUR writing.

Grammarly sits next to you while you write and tells you what is wrong — a grammar mistake here, an awkward sentence there, a tone that sounds too harsh. It is like having a careful editor read over your shoulder in real time.

QuillBot takes what you have already written and produces a different version of it. You paste in a paragraph and it gives you back the same meaning expressed in different words. It is more like having someone rewrite your draft for you entirely.

That difference explains almost everything about who should use which tool. Once you understand it, the choice becomes much clearer.

What is Grammarly?

Grammarly launched in 2009 and has grown into one of the most widely used writing tools in the world — over 30 million people use it daily. It works across more than 500,000 apps and websites, which means it shows up wherever you write: Gmail, Google Docs, Microsoft Word, Slack, LinkedIn, Twitter, and pretty much anywhere else you type.

Here is what it actually does:

• Fixes grammar, spelling, and punctuation in real time as you type
• Catches clarity issues — sentences that are too long, too wordy, or confusing to read
• Adjusts your tone — tells you if your email sounds too aggressive or your report sounds too casual
• Suggests better vocabulary — recommends stronger, more precise words
• Checks for plagiarism — scans against billions of web pages (Premium only)
• Generates content with AI — built-in generative AI for drafting emails and social posts

The key thing about Grammarly is that it works everywhere, invisibly, all the time. You do not have to remember to use it — it is just always there, quietly making your writing better every single day without you thinking about it.

What is QuillBot?

QuillBot launched in 2017 and built its reputation on one thing: paraphrasing. You paste text in on the left side of the screen and the rewritten version appears on the right. You can choose from seven different writing modes depending on what you need:

• Standard — Balanced rewrite, close to the original
• Fluency — Smooth, natural-sounding output
• Formal — More professional and academic tone
• Simple — Easier to read, plainer language
• Creative — More adventurous rewrites with different phrasing
• Expand — Adds more words and detail to short text
• Shorten — Cuts text down to its key points

Beyond paraphrasing, QuillBot also offers grammar checking, a summariser, plagiarism detection, a citation generator, a translator in 45+ languages, and an AI detector. It has grown from a single-purpose tool into a full writing toolkit — particularly popular with students and content creators.

Grammar Checking — Which is More Accurate?

Both tools check grammar. But they do it differently — and the difference matters in real daily use.

In real testing with the same document, Grammarly and QuillBot both caught the same number of basic errors — but Grammarly went significantly deeper. It did not just fix spelling and grammar mistakes — it flagged awkward phrasing, passive voice issues, sentences that were too long, and words that were technically correct but weaker than they could be.

QuillBot caught the basics well, but missed some style-level suggestions that Grammarly picked up — like changing “as quick as I could” to “as quickly as I could.” Small thing, but these small things add up across a long document or an important client email.

For everyday grammar checking — especially across email, work documents, and social media — Grammarly is the stronger tool. It goes beyond fixing mistakes to actively improving the quality of your writing sentence by sentence.

Paraphrasing and Rewriting — No Contest

This is QuillBot’s home ground and it shows clearly. The paraphrasing quality in QuillBot is genuinely impressive — especially in Formal and Creative modes. It takes your original text and produces a meaningfully different version that keeps the core meaning completely intact.

Grammarly does offer some rewriting features, but they are not in the same league. Its suggestions tend to be sentence-level tweaks rather than full rewrites. If you need to significantly rework a paragraph — changing the phrasing, adjusting the tone, or repurposing content for a different audience — QuillBot does this far better than anything Grammarly offers.

The synonym slider in QuillBot is a particularly useful feature. You control how aggressively it replaces words — subtle tweaks on the left, more dramatic rewrites on the right. This level of control is something Grammarly simply does not offer at all.

QuillBot wins paraphrasing — and it is not even close.

One honest warning though: push the synonym slider too far to the right and the output starts sounding unnatural — like a thesaurus was given too much creative freedom. The sweet spot is somewhere in the middle for most tasks.

Plagiarism Checking

Both tools offer plagiarism checking but with important differences worth knowing before you pay for either.

Grammarly’s plagiarism checker scans against billions of web pages and is widely considered more thorough and reliable for professional and academic use. It is only available on paid plans.

QuillBot also offers plagiarism checking — and importantly, it offers an AI detector completely for free. In testing, QuillBot’s AI detector correctly identified a fully human-written document as 100% human, and a mixed document as 60% AI-generated and 40% human. That level of accuracy for a free feature is genuinely impressive and useful.

One important note for students especially: if your goal is to make AI-generated content pass detection tools like Turnitin — neither of these tools reliably does that. QuillBot paraphrasing only has about a 38% bypass rate against Turnitin in 2026 testing. If that is what you need, neither tool is the right one for the job.

Pricing Comparison 2026

Plan	Grammarly	QuillBot
Free	Unlimited grammar checking, basic features	125-word paraphrase limit, 3 modes only
Premium Monthly	$30/month	$19.95/month
Premium Annual	~$12/month billed annually	~$8.33/month billed annually
Best value plan	Annual at ~$12/month	Annual at ~$8.33/month

QuillBot is noticeably cheaper — especially on the annual plan. At $8.33/month versus Grammarly’s $12/month annually, QuillBot is about 30% cheaper. That gap matters if budget is a real concern.

However, Grammarly’s paid plan unlocks significantly more — deeper writing suggestions, tone detection, full plagiarism checking, and integration across 500,000+ apps. You are paying more, but you are getting a tool that genuinely does more for your everyday writing quality.

Free Version — What You Actually Get

This is where Grammarly wins clearly for most people starting out.

Grammarly’s free version gives you unlimited grammar, spelling, and punctuation checking — everywhere you write, forever. There is no word limit. No daily cap. It works in your browser, your email, your Google Docs. For many people, the free version alone is enough and they never need to upgrade.

QuillBot’s free version is more limited in a way that actually frustrates daily use. You can only paraphrase up to 125 words at a time — which is roughly one solid paragraph. You also only get access to three of the seven paraphrasing modes. For anything longer than a paragraph, you will hit the wall quickly and feel the pressure to upgrade almost immediately.

If you are not ready to pay for anything yet — start with Grammarly free. It gives you genuine, unlimited value at no cost whatsoever. For more free AI tools worth trying, see our full guide to the best free AI tools in 2026.

Pros and Cons

Grammarly

• ✅ Works everywhere — 500,000+ apps and websites
• ✅ Free version is genuinely useful with no word limits
• ✅ Real-time grammar, tone, and style suggestions
• ✅ Best-in-class for everyday professional writing
• ✅ Built-in generative AI for drafting content
• ✅ Plagiarism checker scans billions of pages
• ❌ Expensive on monthly plan — $30/month
• ❌ Only supports English — no other languages at all
• ❌ Can sometimes over-suggest and unintentionally change your voice
• ❌ Some users find it annoying when it flags intentional stylistic choices

QuillBot

• ✅ Best paraphrasing tool available — seven modes, synonym slider
• ✅ Much cheaper than Grammarly — especially on annual plan
• ✅ Supports 25+ languages for paraphrasing
• ✅ AI detector available completely free
• ✅ Citation generator — very useful for students
• ✅ Summariser, translator, and PDF editor included
• ❌ Free version limited to 125 words — frustrating quickly
• ❌ Grammar checking is basic compared to Grammarly
• ❌ Paraphrasing can sound unnatural at high synonym settings
• ❌ Not integrated into as many apps as Grammarly

Who Should Use Which?

Choose Grammarly if you:

• Write emails, reports, or professional content every single day
• Want a tool that works invisibly across all your apps without thinking
• Write only in English
• Want real-time feedback while you write, not after the fact
• Are a professional, marketer, or business writer who needs polished output fast

Choose QuillBot if you:

• Frequently need to rephrase, rewrite, or repurpose existing content
• Are a student who needs a citation generator and summariser regularly
• Write in multiple languages
• Are on a tight budget and want more tools for less money
• Need to summarise long articles or documents quickly

Use both if you:

Do a lot of content creation work — write original drafts with Grammarly’s help, then use QuillBot to create variations or rephrase sections for different platforms. Many content creators use them together for exactly this reason. The annual cost of both combined is still under $25/month total.

Final Verdict

There is no single winner here because these tools solve genuinely different problems. But let me give you the clearest possible guidance:

If you only buy one — buy Grammarly. Its free version alone delivers more daily value than QuillBot’s free version. And at the paid level, the depth of writing improvement it offers is unmatched for everyday professional writing.

If you write content at scale — add QuillBot. For bloggers, content marketers, and students who frequently need to rephrase or repurpose text, QuillBot’s paraphrasing is worth every penny — and at $8.33/month annually, it is not a big financial ask at all.

Nova Quinn’s Ratings:
Grammarly — 4.5/5 for everyday writing
QuillBot — 4.2/5 for paraphrasing and rewriting

FAQ

Can I use Grammarly and QuillBot together?

Yes — and many writers do. A common workflow is using QuillBot to rephrase a section, then running it through Grammarly to polish the grammar and tone. They complement each other well and the combined annual cost is under $25/month total.

Which is better for students?

QuillBot tends to be more popular with students because of its citation generator, summariser, and lower price. However, Grammarly’s free grammar checking is also invaluable for academic writing. Many students use both — Grammarly free for grammar, QuillBot Premium for paraphrasing.

Does QuillBot bypass plagiarism checkers?

Not reliably. In 2026 testing, QuillBot paraphrasing only bypasses Turnitin about 38% of the time. Modern plagiarism and AI detectors are specifically trained to spot paraphrasing tool patterns. Do not rely on either tool for this purpose.

Is Grammarly worth $30/month?

At $30/month it is hard to justify for most people. But on the annual plan at around $12/month, it is much better value — especially if you write professionally every day. The free version covers basic needs well, so only upgrade if you genuinely need the plagiarism checker, tone adjustments, and full style suggestions.

Which tool is better for non-English writers?

QuillBot — clearly. It supports paraphrasing in 25+ languages and grammar checking in English, German, French, Spanish, and Portuguese. Grammarly currently only supports English, which is a significant limitation for anyone writing regularly in another language.