QuillBot Fails AI Detectors. SupWriter Doesn't.
QuillBot charges $19.95/month and still only bypasses 42% of AI detectors. SupWriter gives you 300 free words with a 99%+ bypass rate. Zero credit card needed.
Why QuillBot's Free Tier Falls Short
125-Word Limit
QuillBot's free plan caps you at 125 words per paraphrase. That's barely a paragraph. Most essays need thousands of words humanized.
42% Bypass Rate
We tested QuillBot against Turnitin, GPTZero, and Originality.ai. It failed more than half the time. Turnitin now flags QuillBot text with purple highlights.
Premium Paywall
Want more than basic paraphrasing? That's $19.95/month. And even the paid version wasn't built to beat AI detectors — it's a paraphraser, not a humanizer.
Experience the Difference - Try SupWriter Now
See how SupWriter creates truly undetectable content that QuillBotcan't match
Trusted by students, researchers & writers worldwide
Why Students Are Ditching QuillBot for Free Alternatives
We get it. You found QuillBot, thought it would make your ChatGPT essays undetectable, and then got flagged by Turnitin anyway. You're not alone.
Here's the thing most people miss: QuillBot is a paraphraser, not a humanizer.It swaps synonyms and rearranges sentence structure. That fooled AI detectors back in 2023. It doesn't anymore.
Turnitin rolled out an update in late 2025 that specifically targets paraphrasing tool patterns. QuillBot's output now gets flagged with purple highlights — the exact color Turnitin uses for "AI-assisted writing." We ran 50 essays through QuillBot and tested every single one. The result? Only 42% bypassed detection. That means more than half your submissions are getting caught.
And QuillBot's pricing doesn't help. The free tier gives you 125 words. That's not even enough for an introduction paragraph. Want unlimited? That's $19.95 a month. For a tool that fails detection over half the time.
Students are broke. We know because we were students too. Paying $20/month for a tool that works less than half the time is a bad deal by any measure. That's why thousands have switched to QuillBot alternatives that actually work.
SupWriter's Free Tier: What You Get
No gimmicks. No "enter your credit card for a free trial" nonsense. Here's exactly what SupWriter gives you for free:
- 300free words— enough to test a full paragraph or short essay section. More than double QuillBot's 125-word free limit.
- 99%+bypass rateacross Turnitin, GPTZero, and Originality.ai. Same rate on free and paid plans. We don't nerf the free version.
- $0credit card required. Sign up with your email and start humanizing. If you want more words later, paid plans start at $9.99/month — half what QuillBot charges.
The free tier uses the same humanization engine as our paid plans. We don't downgrade quality to push upgrades. You get the full 99%+ bypass rate whether you're on the free plan or the Ultra plan.
QuillBot Free vs SupWriter Free: Honest Comparison
We're not going to pretend QuillBot is useless. It's a solid paraphrasing tool. But for AI humanization specifically, the free tiers aren't even close:
The numbers speak for themselves. QuillBot gives you fewer words, lower bypass rates, and charges nearly double if you upgrade.
One thing QuillBot does offer that SupWriter doesn't: a grammar checker and citation generator. If you need those, pair SupWriter with a free grammar tool like Grammarly's free tier. You'll still save money compared to QuillBot Premium.
Curious how Turnitin catches QuillBot paraphrasing? We did a deep dive with real test results. And if you want to see how QuillBot stacks up against other tools, check our QuillBot vs WriteHuman comparison.
Related Resources
- Best QuillBot Alternatives (2026) — Full ranked list for humanization
- Grammarly vs QuillBot — Head-to-head comparison
- QuillBot Review 2026 — Honest test results and bypass rates
- Can Turnitin Detect QuillBot? — Proof that Turnitin flags it
- Best Grammarly Alternative — If you also use Grammarly
Humanize AI Writing in 3 Simple Steps
Transform AI-generated content into natural, human-like text that bypasses detection
Your Text
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Paste Your AI-Generated Text
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Result
Check AI Score
See how much of your text is flagged as AI-written by detection systems.
Edit or review selection
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Humanize & Improve selection
Transform your text to sound 100% human-written. Select any text to improve, fix the grammar, shorten, or lengthen it.
Engineered for
Undetectable Results
Our rewriting engine is trained on over 1.2 million samples of academic writing, essays, and AI-generated text to understand the nuances of human writing.
Advanced Linguistics
Analyzes syntax, tone, and word patterns to remove robotic footprints.
Smart Restructuring
Restructures sentences while preserving your original meaning and intent.
Adaptive Learning
Continuously updates to bypass the latest AI detection algorithms.
Ask AI to Fix Selection
Select any text and use AI to improve, fix grammar, shorten, lengthen, or customize with your own prompts.
Tested and Proven Across All AI Detectors
We test every rewrite against leading detection tools like GPTZero, Turnitin, ZeroGPT, and more. Our system is updated weekly to adapt to new detection methods and eliminate flagged patterns.
99%success rate across all major detection platforms
Trusted by 10,000+ Writers Worldwide
Students polish their writing to sound more natural, marketers improve content for better engagement and SEO, and businesses send emails that feel personal — not robotic.
Reviews
What our users say
Thousands of writers trust SupWriter every day
I've been using SupWriter for weeks, and it's become essential to my academic writing and research workflow. As a Ph.D. student in environmental law, I'm constantly drafting, refining, and translating complex texts, and SupWriter makes the whole process far more efficient and less stressful.
It's so great and I love this app. Everyone should use it. It helped me pass my essay!
I really like this app. It rephrases my text so well that Turnitin doesn't pick it up. Pretty amazing.
What impressed me most is how seamlessly SupWriter polishes my drafts. My clients noticed the difference in quality and tone immediately.
Absolutely wonderful. The best AI humanizer I've used, especially for scientific writing.
This tool lets me do so many things faster, and its features are genuinely useful.
Really good. I didn't expect it to be this great. It genuinely enhanced my writing. Give it a try.
This product is so good. I'll choose it over and over again. It has my heart. ❤️
The Fix Selection feature is a game changer. I can select any text and improve it, fix the grammar, or make it shorter, and my content workflow has never been faster.
Excellent service, really helpful for job applications, and it even has an AI detector. I'd highly recommend it to students, professors, and writers. An amazing writing tool.
It was amazing. I upgraded, and since then my work has consistently scored high marks.
The best humanizer ever.
It was great, especially in a foreign language. It helped the adjectives come out smoother than I expected!
I'm on the Ultra Monthly plan and bought $20 in extra credits. This platform is super good, and I'm planning to switch to the Yearly plan soon.
Precisely written and a very nice app. I recommend everyone give it a try.
I was amazed to see the AI-flagged text identified so accurately. It really helps crack down on AI interventions.
My professor commended the uniqueness of my essay after I used SupWriter to make it sound natural. Strongly recommended for students!
The website is fantastic. It's clean, modern, and visually appealing. Navigation is intuitive, pages load fast, and everything works well on desktop and mobile. A smooth, enjoyable experience. I'm really impressed!
Really, the only one that passed the YouScan detector.
It's been a great tool to use, and very helpful.
My experience with the AI detector was great. The interface is simple and easy to navigate, and results came back quickly with useful detail.
This experience has been amazing, and the service is extremely helpful.
My experience was amazing. SupWriter is very easy to use, and it actually works!
Impressed by the quality, and cheaper than other platforms.
SupWriter is great. It helps me become a better writer and a better student overall.
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