Head-to-head comparison
GPTZerovsOriginality.ai
The two most-used commercial AI-text detectors, aimed at different buyers. GPTZero grew up in education and shows sentence-level highlighting plus writing-process evidence; Originality.ai grew up in SEO publishing and adds plagiarism, site scans, and team seats. Neither is reliable enough to punish someone on a score alone.
At a glance
| GPTZero | Originality.ai | |
|---|---|---|
| Category | Writing | Writing |
| Function | AI detector | AI detector |
| Pricing | Freemium | Paid |
| Starting price | Free 10,000 words/mo; Essential from $10/mo | Pay-as-you-go from $30 (3,000 credits); Pro from $14.95/mo |
| Released | January 2023 | November 2022 |
GPTZero
Pros
- Sentence-level view is more useful than a single score
- Writing Reports offer real evidence beyond probability
- Transparent about false-positive rates
Cons
- False positives remain a real risk, especially for non-native writers
- Humanised AI text often passes
- Word limits on lower tiers
Originality.ai
Pros
- Built for volume and teams, not one-off checks
- Regularly retrained against new models
- Site-wide scans catch problems across a whole publication
Cons
- No meaningful free tier
- Aggressive detection means more false positives on human text
- Credits are consumed per scan and per feature
Which one should you pick?
Pick GPTZero if
You are a teacher or editor who needs to understand how a document was written, not just a probability — and you want a free tier to start with.
See GPTZero details →Pick Originality.ai if
You run a content operation checking many writers and whole websites, need plagiarism detection in the same tool, and can budget for credits.
See Originality.ai details →Bottom line
GPTZero for education and individual editors. Originality.ai for agencies and publishers at volume. In both cases, treat the score as a prompt for a conversation, never as proof.