Starting price
Free
Free tier
10000 words
Founded
2023
What GPTZero does
GPTZero is a detector tool. The detector most frequently named as the benchmark that humanizer tools market their bypass rates against.
Pricing: Free tier available; paid educator and enterprise plans scale by document volume.
Bundled AI detector: No — pair with a standalone detector like GPTZero or Originality.ai
Strengths and weaknesses
What works
- Built specifically with educators in mind, with classroom-management features
- Sentence-level highlighting shows exactly which parts of a document triggered flags
- Free tier is generous enough for individual use
What to watch for
- Like every AI detector, has a documented false-positive rate on human-written text, especially from non-native English writers
- Detection accuracy shifts as underlying language models change, so scores aren't static
Our verdict
GPTZero is best for: Teachers and institutions who need transparent, sentence-level flagging rather than a single opaque score.
Who GPTZero is (and isn't) right for
Based on our testing notes, GPTZero fits users whose top priority matches its core design. The detector most frequently named as the benchmark that humanizer tools market their bypass rates against. If your priority is a different tradeoff — price, bundled features, or language coverage — one of the alternatives below may fit better.
Frequently asked questions
Is GPTZero free to use?
GPTZero offers a free tier of 10000 words before you need to sign in or upgrade.
Does GPTZero include an AI detector?
No — pair with a standalone detector like GPTZero or Originality.ai.
How much does GPTZero cost?
Free tier available; paid educator and enterprise plans scale by document volume.