Writing & AI tools / GPTZero
GPTZero
Best free AI detector - simply paste your text to instantly get an overall AI score and advanced sentence by sentence detection.
Where it stands
4.1 / 5
Signals score
Not a hands-on test
Based on 1 of 3 signals
- Website health4.8 / 5 · weight 50%
Measured from the tool's public website
Built only from what we can measure or quote without using the tool. How ranking works
Rank by signals
We have not run our own hands-on test on GPTZero yet. Facts checked 2026-11-08. How tests work
Disclosure: agathox makes some of the tools listed here. They are labelled and scored by the same method as every other tool.
Should you use GPTZero?
A quick read built only from what the tool's own pages state and from our tests, not from opinion. Facts checked 2026-11-08.
A good fit if…
Nothing is clearly stated yet.
Check first
- Its pages do not state: pricing, watermark. Check on the tool's site before you rely on it.
Does: AI content detector
Measured signals
4.8 / 5 · measured 2026-11-08Read automatically from GPTZero's public website: how reliable, secure, private and open the site is. This is not a test of how well the tool does its job. How this is measured
- Reliability5 / 5The page answered and finished downloading in 69 ms.
- Security5 / 54 of 5 protective headers set (strict-transport-security, content-security-policy, referrer-policy, x-frame-options).
- Privacy4 / 51 third-party tracking service found: Amplitude.
- Transparency5 / 5Links a privacy policy; links a pricing page.
Community feedback
Not enough discussion yet: 1 classified comment from 1 thread. We need at least 12 from 2 threads.
- Positive
“This is nice and all, but what repercussion does GPTZero get when their bullshit AI detection hallucinates a student using AI. And when that student receives academic discipline because of it”
Read in the thread
Threads: GPTZero finds 100 new hallucinations in NeurIPS 2025 accepted papers (2026, 507 comments)
- Free tier
- Not stated.
- Paid plan
- Not stated.
- Signup
- A free account is required for scans exceeding 10,000 characters. The page says: “For scans over 10,000 characters, create a free account first.”
- Watermark
- Not stated.
- Where files go
- Files are uploaded for review. The page says: “Paste Text or Upload Document: Paste in raw text or upload your file for review and press ‘Scan’.”
From the tool's own pages, checked 2026-11-08. Sources: Home. Prices and limits change; check the tool before you rely on them.
Read automatically by a program, not by a person. Each fact quotes the sentence it came from, and a fact is shown only if that sentence is on the page. Where a page did not say, it reads “Not stated.”
Get an email if GPTZero changes
We check its official pages every week. If they change, we tell you, so you can see if the price or limits moved. No other email, and one click stops it.
Are you the maker of GPTZero? Link to this page
Copy this into your site. The link goes to this page, and it does not change any score.
<a href="https://agathox.com/tools/gptzero">GPTZero on agathox: compared and tested</a>
Tasks and scores
- AI content detectorNot tested yet
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