QuillBot Review 2026: Features, Pricing and AI Detection

QuillBot is one of the most widely used writing tools on the web, especially among students. The question most people bring to it in 2026 isn't whether it paraphrases well — it does — but whether it can make AI-generated text get past a detector.

So this review covers what QuillBot actually offers, what its free and Premium plans include (from QuillBot's pricing page, checked September 2026), and what Turnitin itself documents about paraphrased AI text. No affiliate links. We make a competing humanizer, so weigh our view accordingly.

Quick Verdict

Paraphrasing Quality

3.5 / 5

Solid synonym replacement and sentence restructuring. Still one of the best-known pure paraphrasers on the market.

Hiding AI Text

Not what it's for

Turnitin has flagged AI text run through paraphrasing tools since December 2023, in English. Don't rely on QuillBot for this in 2026.

Bottom line: QuillBot is a good paraphrasing tool that people mistakenly use as an AI humanizer. If you need cleaner sentence structure, it still does that reasonably well. If your worry is AI detection, a paraphrase is not a disguise, and no tool can promise a detector result.

What Is QuillBot?

QuillBot launched in 2017 as an AI-powered paraphrasing tool. The pitch was simple: paste in text, get a reworded version. Over the years it has added a grammar checker, summarizer, citation generator, plagiarism checker, AI detector and its own AI Humanizer. It's become a Swiss Army knife for writers, especially students.

The core product is still the paraphraser. The free plan gives you two modes, Standard and Fluency. Premium unlocks nine modes, including Academic and Simple, plus unlimited custom modes you define yourself, and it paraphrases in 23 languages.

Each mode rewrites differently, and the "synonym slider" controls how aggressive the word swaps get. Crank it to the right and you get more aggressive replacements. Crank it too far and your text starts reading like a thesaurus had a seizure.

QuillBot Pricing Breakdown

QuillBot runs on a freemium model. The free tier is functional but limited, and the premium tier is where the real features live.

QuillBot advertises the annual Premium price as 58% off; paying month to month costs more. That puts Premium in the same range as dedicated AI humanizers. But here's the catch: you're paying mainly for paraphrasing and writing tools, not for anything that changes how a detector scores your text. And that matters a lot in 2026.

For comparison, SupWriter starts at $9.99/month ($4.99 billed annually) for 5,000 words, and is built specifically for rewriting AI-assisted drafts so they read naturally, with an AI detector in the same workspace — a different value proposition.

AI Detection: What QuillBot Can and Can't Do

This is the section that matters. We know most people reading this review want one answer: "Can I run my ChatGPT output through QuillBot and get past Turnitin?"

Short answer: don't count on it.

We haven't published a QuillBot bypass test, and we're not going to quote a percentage we can't show you. What we can do is set out what the detection vendors document, why paraphrasing often doesn't move the signal, and how to check your own draft.

What Turnitin documents. Turnitin added detection of AI-generated text that was modified by paraphrasing tools in December 2023, and detection of AI "bypasser" tools in August 2025, both for English submissions only (Turnitin's release notes). Its FAQ says the detector covers likely AI text "that may have been modified using a word spinner/AI paraphrasing or bypassing tool to evade detection" (Turnitin's AI detection FAQ).

Why paraphrasing often isn't enough. A paraphraser swaps words and rearranges clauses, but the draft underneath keeps its structure: the same even paragraph lengths, the same sequence of claims, the same tidy transitions. Detectors score that shape as well as the vocabulary, which is why a heavily reworded AI paragraph can still read as machine-made.

How to check your own draft. You can't run Turnitin yourself; its AI report is for instructors. What you can do is run the exact text you plan to submit through a detector you have access to, treat the score as information rather than a verdict, and keep your drafts and notes. Results vary by detector, text length and topic, so one clean score elsewhere is not a promise about Turnitin.

The Turnitin Problem

If you're a student, this section is specifically for you.

Turnitin keeps updating its English model. Its release notes list the bypasser-detection update on 27 August 2025, a recall update on 14 October 2025, and another on 12 February 2026. QuillBot's paraphrasing approach (synonym swapping and sentence restructuring) was built long before those updates and was never designed to get past them.

What instructors actually see has changed too. Until August 2026, Turnitin's report showed AI-modified text (paraphrased or run through a bypasser) in purple, separately from AI-generated text in blue. On 4 August 2026 Turnitin moved to "a single, unified blue highlight for all likely AI-generated and AI-modified content" (Turnitin). So a paraphrased passage now simply counts toward the one AI percentage. The report doesn't name the tool involved, and students can't see it at all.

We wrote about this in detail in our Turnitin vs QuillBot deep dive, but the short version is: if your professor uses Turnitin, QuillBot is not a safe bet for hiding AI-written text, and it hasn't been since paraphrase detection arrived in December 2023.

What QuillBot Does Well

We're not here to trash QuillBot. It's a genuinely useful tool when used for what it was designed to do. Here's where it earns its 3.5/5 paraphrasing score:

Paraphrasing is still its strength. If you need to reword a paragraph without changing the meaning, QuillBot handles it well. The modes produce noticeably different output from the original, and on sensible settings the meaning usually survives intact.

Academic mode is useful. Making casual text sound more scholarly is exactly what students reach for it to do, and it's a reasonable job for a paraphraser — not Pulitzer material, but appropriate for academic contexts.

Grammar integration works. The built-in grammar checker catches basic errors, so you don't end up with grammatically broken synonyms. It's not as thorough as Grammarly, but it handles the obvious stuff.

The Chrome extension is handy. You can highlight text on a webpage and paraphrase it in place. For researchers pulling quotes from multiple sources, this is genuinely helpful.

What QuillBot Does Poorly

AI detection bypass is unreliable. We covered this above, but it bears repeating: QuillBot rewords, it doesn't change the overall statistical shape of a draft, and Turnitin documents that it looks for paraphrased AI text. If you're relying on QuillBot to make AI text undetectable, you're gambling with your grade or your reputation.

Meaning distortion is a real risk. On aggressive synonym settings — the ones people reach for when they hope to dodge detection — paraphrasers can swap technical terms for wrong near-synonyms, flip negations, and flatten nuance. A phrase like "reducing oxidative stress" can come back as something like "diminishing corrosive pressure." That's not a paraphrase — that's a different claim. Check terms of art after every pass.

Output sometimes sounds robotic. Ironically, for a tool people use to "humanize" AI text, heavy paraphrasing can make text sound less natural. Phrases like "utilize methodologies to ascertain" replacing "use methods to find out" don't sound human — they sound like a computer trying to sound human.

The free tier is too limited. 125 words is barely a paragraph, and the free AI Humanizer has the same cap. You can't meaningfully test the tool on a full piece before paying, which pushes people toward Premium before they realize its limits.

Better Alternatives for AI Humanization

If your goal is specifically to make AI-assisted text read naturally, you want a purpose-built AI humanizer, not a paraphraser. There's a fundamental difference.

Paraphrasers like QuillBot swap words and restructure sentences. AI humanizers target the statistical patterns that detectors look for — perplexity, burstiness, sentence length variation, vocabulary distribution — and rewrite text to match human writing patterns at a deeper level.

SupWriter was built for this. It rewrites AI-assisted drafts so they read naturally, and its built-in AI detector lets you check the result before you submit. That detector is a pre-check based on one scoring model, not the one your school uses, and no tool can guarantee how Turnitin will score your work (how we test).

For a closer look at QuillBot's own humanizer mode, read our QuillBot humanizer review. And if you're looking for a budget option, check our free QuillBot alternative guide.

Frequently Asked Questions

Is QuillBot worth it in 2026?

For paraphrasing, yes — it's still one of the best-known tools in its category. For hiding AI-written text, no: Turnitin documents that it detects paraphrased AI text in English. If AI detection is your concern, a dedicated humanizer like SupWriter that lets you rewrite and pre-check in one place is the better fit, though no tool can guarantee a result.

Can Turnitin detect QuillBot paraphrasing?

Turnitin says its detector covers AI-generated text modified by paraphrasing tools, for English submissions, and it has done so since December 2023. Since 4 August 2026, that text counts toward the single AI percentage instead of a separate purple highlight. Turnitin doesn't identify QuillBot by name. Read our full Turnitin detection analysis for details.

Is QuillBot better than Grammarly?

They do different things. QuillBot is better at paraphrasing. Grammarly is better at grammar checking and writing suggestions. Neither is effective at bypassing AI detectors. For a full comparison, see our Grammarly vs QuillBot breakdown.

Does QuillBot have a free version?

Yes. The free plan paraphrases up to 125 words at a time in two modes (Standard and Fluency), with limited access to the AI Humanizer and AI Detector. Premium is $8.33/month billed annually, per QuillBot's pricing page (checked September 2026); monthly billing costs more.

What's the best QuillBot alternative for AI humanization?

We'd point you to SupWriter — with the obvious caveat that we make it. Unlike QuillBot, it's designed for rewriting AI-assisted drafts rather than basic paraphrasing, and it includes a detector so you can check before you submit. Try it on your own text: the free tier is 300 words with no credit card required.

Final Verdict

QuillBot is a solid paraphrasing tool that's being used for something it wasn't built for. If you need to reword text for clarity or tone, it's still a good choice. If you need AI-assisted text to read as your own, you're looking at the wrong tool, and Turnitin's own documentation tells you why. We'd recommend QuillBot for paraphrasing and SupWriter for humanization. Using one tool for both jobs means doing both poorly.

Related Resources

• Best QuillBot Alternative — Tools compared
• QuillBot Humanizer Review — Does it actually work?
• Can Turnitin Detect QuillBot? — What Turnitin documents
• Grammarly vs QuillBot — Head-to-head comparison
• Best AI Humanizer Tools — Complete ranked list