Compare · QuillBot
QuillBot alternative focused on clearing AI detectors
Many people reach for QuillBot to paraphrase, then realize they also need the output to read as human to AI detectors. Paraphrasing and humanizing overlap, but they are not the same job, and a reworded sentence can still get flagged.
QuillBot is an excellent, widely loved writing and paraphrasing suite. Undetected.ai is purpose-built for that job: it rewrites your text into natural prose, keeps your meaning, and shows our own AI-pattern score before and after with the reasons behind it, rather than a bare pass claim.
2 free runs a day, up to 200 words each. We save your run so you can get back to it, and a delete button appears with the result. See privacy.
This is our own AI-pattern score, measured here on sentence rhythm, template phrases, vocabulary variety and passive voice. It is not a GPTZero, Turnitin, Originality.ai, Copyleaks or ZeroGPT result, and it does not predict one. Worth knowing: we also ask the rewrite to vary sentence length, drop template phrases and prefer the active voice, so some of the drop is built in. Read the two panels below, not just the number.
Before ·
After ·
Meaning kept · Your own text rewritten · Saved to your history, delete any time
The short answer
If you reached for QuillBot to beat AI detection, a purpose-built humanizer is the better fit, because paraphrasing rewords a sentence without changing the structure and rhythm detectors actually read. Undetected.ai rewrites the structure and rhythm detectors read, keeps your meaning, and shows our AI-pattern score before and after, from $9 a month. QuillBot remains the stronger pick if you mainly want paraphrasing, grammar and citation tools rather than detector clearance.
Reviewed July 2026. Both tools are capable; the differences below are what actually decide it.
QuillBot is a great all-round paraphrasing and writing suite; Undetected.ai is built specifically to humanize AI text, with a visible score for the draft and the rewrite.
Prices we read ourselves
What QuillBot costs, and what we cost
Read off each vendor's own pricing page on the date shown, not copied from a roundup. Where the yearly rate is cheaper we lead with it, because that is the number buyers compare.
| Undetected.ai | QuillBot | |
|---|---|---|
| Cheapest paid plan | $9/mo billed yearly ($12 monthly) | $8.33/mo billed yearly ($19.95 monthly, $99.95/yr) |
| What that carries | 15,000 words/mo across 60 runs, 1,500 words a run | Unlimited paraphrasing on Premium, and its humanizer page states no word or usage limit on Premium. The free tier caps each paraphrase at 125 words |
| Try it before paying | Free account: 3 runs/day, 9,000 words/mo | Yes. The free plan allows 125 words per paraphrase in 2 modes, plus 125 words of humanizing at 6 uses a day |
| Where they win | One pass over your own text, with our AI-pattern score and its reasons | A genuine writing suite: paraphrasing modes, grammar checking, a plagiarism checker, citation tools and, since 2026, its own AI detector and AI humanizer in the same subscription. Its humanizer page still makes no promise about clearing any named detector, which is more restrained than most of this category |
QuillBot pricing read August 10, 2026. All figures in USD. Promotional rates move constantly, so confirm on the vendor's own page before you buy. We build one of these tools.
Not sure any of them do what they claim? We published the ten-minute test for whether an AI humanizer actually works, which costs nothing and settles it on your own writing.
Side by side
Undetected.ai vs QuillBot, honestly
A fair look at what each does well. Both are capable tools. Here is where they differ.
| What matters | Undetected.ai | QuillBot |
|---|---|---|
| Built for AI detection | Rewrites specifically to read as human to detectors | A broad paraphrasing and writing toolkit |
| Our AI-pattern score | Animated red-to-green score on your text | Focuses on rewriting modes and grammar |
| The reasons behind the score | Shows our AI-pattern score and what earned it | Offers an AI detector as a separate feature |
| Meaning preserved | Keeps facts and argument while changing rhythm | Strong at meaning-aware paraphrasing |
| What you see after the rewrite | Our own AI-pattern score before and after, with its reasons | Paraphrasing is not aimed at clearing detectors |
| Best suited for | Writers whose work must read human to detectors | Anyone needing all-round writing and grammar help |
Comparison reflects general, publicly understood positioning. Capabilities change, so check each product for the latest.
Want the full head-to-head with verified pricing tables? Read QuillBot vs Undetected AI.
Why writers pick Undetected.ai
The humanizer that shows its work
One job, done well
Undetected.ai is built around the detection problem, so the rewrite is tuned to read as human to scanners rather than just reword a sentence.
See the score, not just the text
Our own AI-pattern score, measured before and after with its reasons, is something a general paraphraser does not put in front of you.
Meaning stays intact
Like a good paraphraser, the rewrite keeps your meaning, and it returns natural prose you can publish without cleanup.
Good questions
QuillBot vs Undetected.ai, answered
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Further reading: QuillBot AI humanizer: word limits, price and alternatives · QuillBot pricing: what Premium costs and every free cap · Can AI detectors detect paraphrasing?
Try Undetected.ai on your own text
Paste your own text and read the rewrite next to the original, with our AI-pattern score measured on both before you copy.
Meaning kept · Your own text rewritten · Saved to your history, delete any time