QuillBot Review 2026
QuillBot is a paraphrasing and writing tool with a free tier, a free AI Detector and a free AI Humanizer. Its help center puts word limits on the free plan. We could not read its official site on 2026-10-16, so its prices and feature claims here come from its help center and from search-result text of its pages. Nothing here shows that its output passes any AI detector, and we did not test that. A humanizer does not check facts or add original thinking.
Profile
QuillBot is not in our catalogue. We removed it on 2026-10-14 because its official page returned an error, and this review does not return it to the catalogue. It is covered here because it is the subject of our alternatives page.
Company record: QuillBot was founded in October 2006 in Redwood City, California, and is owned by Learneo. The co-founders named in our archive are Andrew Grauer and Gregor Carrigan (F11, from the Wikipedia infobox in our archive). That record does not come from QuillBot’s site.
Strengths named in our sources
- The free plan includes Standard and Fluency paraphrasing modes, three synonym settings, paraphrasing of up to 125 words and summarizing of up to 1,200 words (QuillBot help center, Q1).
- The AI Detector is free for all users, according to the help center (Q2).
- The AI Humanizer page, as seen in search results on 2026-10-16, calls the humanizer free and states “No word or usage limit” (Q3). This is the vendor’s own claim, and we did not confirm it.
- The Premium page, as seen in search results, lists $8.33 per month billed annually (Q4).
Drawbacks named in our sources
- Free paraphrasing stops at 125 words per input, so longer text needs Premium (help center, Q1).
- Monthly billing costs more than annual billing. Third-party reviews list Premium monthly at $19.95 (Q5).
- The Premium page text we could see places the advanced humanize mode under Premium and the basic mode on the free plan (Q4).
- Our record holds no independent test of QuillBot’s detection results or humanizer output.
Pricing as the sources list it
- Premium at $8.33 per month billed annually, which is $99.95 a year (Premium page text in search results, Q4).
- Third-party reviews list monthly billing at $19.95 and a quarterly plan at $13.31 per month, billed every three months (Q5). We could not confirm these on QuillBot’s own site.
- One search snippet of the Premium page shows $12.49 with no billing period. We could not resolve it and do not use it (Q4).
What the vendor says
The humanizer page, as seen in search results, tells users to follow the AI guidelines of their institution or workplace. It says passing off someone else’s idea as one’s own, even when reworded, is unethical. It also tells users to read the Human score as a signal rather than a verdict (Q3).
Who it suits
- Writers who paraphrase or polish their own drafts and can pay annually for longer documents.
- Users who want a free first look at a text with the AI Detector, read as one signal among others.
- Less suited to anyone who needs a sourced, independent benchmark, because our record holds none for QuillBot.
What we did not test
We did not test QuillBot’s paraphrasing, AI Detector, humanizer or Premium features, and we did not submit any text to it. Its official site returned HTTP 403 to our reads on 2026-10-16.
How to run your own trial
Run a text you wrote yourself through the free tier. Read the output for changed meaning and changed facts, and check the rules of the place where the text will go. Do not treat any detector score as proof either way.
Limits of this page
No tool reviewed here can guarantee that a text passes any AI detector. Whether a given use is allowed under academic or workplace rules is a question you have to verify against those rules yourself. Detector results are not proof of authorship, and a humanizer is not a fact-checker.
This page is not affiliated with QuillBot and is not an official page. Compare the other options on the alternatives page.
FAQ
Is QuillBot’s AI Detector free?
QuillBot’s help center says yes, for all users. We did not test its accuracy. QuillBot’s own humanizer page tells users to read the Human score as a signal, not a verdict.
How much does QuillBot Premium cost?
The Premium page text in search results lists $8.33 per month billed annually. Third-party reviews list $19.95 per month billed monthly. Check the checkout price and the renewal price before you pay, because promotions change.
Can QuillBot make text pass an AI detector?
We cannot confirm that, and we did not test it. A humanizer changes how text reads. It does not add original thinking, check facts or change who wrote the text (F9). Whether a particular use is allowed under school or workplace rules is for you to check.
Does the humanizer keep the meaning of my text?
We have no test of QuillBot on this question. The meaning-preservation study in our record, by Pangram Labs, covers 19 humanizer and paraphrasing tools (F10). Our record does not show whether QuillBot was one of them, so we make no claim.