Best free AI detector - paste text for an AI score and sentence-by-sentence detection. - gptzero.me
· 1 month ago
Fine as a free spot-check when you're merely curious about a suspicious text. Don't pay or act on its verdicts for grades, hiring, or firings — false positives are well documented.
Confidence
Medium. Based on ~20 public sources; accuracy claims conflict sharply between G2 reviewers and Reddit/Trustpilot users.
×Teams uncomfortable uploading confidential text to a third party
×Buyers who think any AI score is courtroom-grade evidence
Gotchas - check before you buy
high
Never use scores to accuse anyone — false positives on human writing are documented, even by professors
medium
Individual plans run $12.99–$24.99/month; check whether free limits actually cover your volume
medium
Your submissions are stored — don't paste sensitive or unpublished material
low
Domain appears in infostealer logs with 7,054 exposed credentials — use unique passwords
Pros and cons
Pros
+Free tier gives instant overall and sentence-level AI scoring
+Rated 4.3/5 on G2 across 101 reviews
+Profitable business with $10M Series A and ~10M users
+Offers an API for integration into other tools
+Claims student privacy compliance since 2024
Cons
−Flagged fully human-written essays as 100% AI
−Critics argue AI writing detectors generally are not credible
−Trustpilot sits at 2.2/5 from 139 reviews
−Independent testers find accuracy mixed and contested
−Submitted text is stored, per third-party privacy review
Sources & method
- 12 sources - privacy/security pages and student-privacy compliance; no known breaches, but the domain appears in infostealer credential logs.
official x4review x5security x2news x1
Domain tied to 7,054 infostealer credentials, Hudson Rock lists in cybercrime stealer logs, meaning some users' credentials were captured by infostealers — a user-hygiene signal, not a confirmed breach of GPTZero.
Key stats
Value for money: 2/5
Rating
$0
Starting price
12
Sources
Analyzed
Value for money: 2/5. Free tier useful; paying for contested accuracy is risky
Ease of use: 4/5. Paste text, instant score — no setup
Support quality: 2/5. 2.2/5 Trustpilot across 139 reviews
Security posture: 3/5. Privacy pages and student compliance, but domain in stealer logs
4.3/5 G2 rating 101 reviews
2.2/5 Trustpilot rating 139 reviews
$12.99–$24.99/mo Paid plans Free tier available
$10M Series A Funding June 2024; profitable per TechCrunch
Pricing
Free
$0
Paste text for AI score
Sentence-level detection
Individual plans
$12.99–$24.99/mo
Higher scan limits
Advanced detection features
Security
privacy/security pages and student-privacy compliance; no known breaches, but the domain appears in infostealer credential logs.
Domain tied to 7,054 infostealer credentialsHudson Rock lists in cybercrime stealer logs, meaning some users' credentials were captured by infostealers — a user-hygiene signal, not a confirmed breach of GPTZero.10
What users say
Users split sharply: G2 reviewers find it practical, while Reddit is full of false-positive complaints and skepticism about detection credibility.
“Help, GPTzero says my essays were 100% AI. I wrote them!!”
Support quality: 2/5. 2.2/5 Trustpilot across 139 reviews
Security posture: 3/5. Privacy pages and student compliance, but domain in stealer logs
Security notes
Public privacy/security pages and student-privacy compliance; no known breaches, but the domain appears in infostealer credential logs.
Domain tied to 7,054 infostealer credentials. Hudson Rock lists in cybercrime stealer logs, meaning some users' credentials were captured by infostealers — a user-hygiene signal, not a confirmed breach of GPTZero.10
What to use instead
Turnitin: Entrenched institutional standard; already integrated in most school workflows. https://www.turnitin.com
ZeroGPT: Free competitor frequently compared head-to-head on accuracy. https://writehuman.ai/blog/gptzero-vs-zerogpt
Winston AI: Paid rival positioned as more accurate in comparisons. https://piperocket.digital
Sapling AI Detector: Free detector often mentioned alongside GPTZero. https://www.reddit.com/r/OpenAI/comments/12oj9co/ai_writing_detectors_such_as_gptzero_are_not/
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