GPTZero is a leading AI content detector for educators and enterprises. See 2026 pricing plans, features, accuracy notes, and top GPTZero alternatives.
Category
AI Writing
Pricing
Freemium, from Free (10,000 words/month); paid plans from about $14.99/month
Verified
Not yet
Last updated
July 18, 2026
Founded
2023
Headquarters
New York, NY, USA
Free PlanWeb AppAPIAIFreemium
Overview
GPTZero is an AI-generated text detection platform founded by Princeton student Edward Tian in January 2023, built to help educators and organizations identify writing likely produced by tools like ChatGPT.
The company scaled rapidly, raising a $3.5 million seed round and later a $10 million Series A, growing to over 19 million registered users and about $30 million in ARR before being acquired by Superhuman in June 2026.
Key Features
GPTZero scores text using perplexity and burstiness analysis, highlights likely AI-written sentences, attempts to identify the source model, and supports batch scanning for grading large volumes of submissions at once.
The platform also offers a browser extension, LMS and classroom integrations, a plagiarism and writing report, and a developer API for embedding detection into other products.
Pricing
GPTZero uses a freemium model: a Free plan offers 10,000 words per month, while paid Essential, Premium, and Professional plans scale up in word limits and features, from about $14.99 to $45.99 per month billed monthly.
Annual billing saves roughly 45% versus monthly pricing, and dedicated Classroom and Enterprise plans use custom, per-seat pricing for schools and larger organizations.
Key Features
Perplexity and burstiness scoring — Analyzes word predictability and sentence-length variation to estimate the likelihood text was AI-generated.
Sentence-level highlighting — Flags the specific sentences or passages most likely to have been written by AI.
Source/model detection — Attempts to identify which underlying AI model may have generated a given passage.
Batch scanning for classrooms — Lets educators scan large volumes of student submissions at once.
Plagiarism and writing report — Combines AI-detection scoring with a broader originality and writing report.
Browser extension — Scans text directly within the browser without needing to copy content into the web app.
API access — Lets developers and platforms integrate GPTZero's detection directly into their own products.
LMS integrations — Connects with learning management systems for classroom-scale deployment.
Pros & Cons
Pros
Early mainstream brand recognition and trust in education settings
Generous free tier for casual, low-volume use
Batch scanning built specifically for classroom-scale grading
Developer API available for platform integration
Detection models are continuously updated
Cons
Like all AI detectors, false positives and negatives are possible and accuracy is debated
Per-word pricing can become expensive for heavy users
Advanced features such as unlimited batch scanning and API access are gated behind paid tiers
Non-native English writing can be flagged at higher rates
Future product direction is uncertain following the 2026 Superhuman acquisition
Pricing
Free $0 Monthly
Essential $14.99/month billed monthly; ~$8.33/month billed annually Monthly or Annual
Premium $23.99/month billed monthly; ~$12.99/month billed annually Monthly or Annual
Professional $45.99/month billed monthly; ~$24.99/month billed annually Monthly or Annual
GPTZero is an AI-generated text detection tool that analyzes writing to estimate the likelihood it was produced by an AI model such as ChatGPT.
Who founded GPTZero?
GPTZero was founded by Edward Tian, a Princeton University undergraduate, who launched it in January 2023.
Is GPTZero free to use?
GPTZero offers a free plan with 10,000 words per month; paid plans start at roughly $14.99 per month for higher word limits and additional features.
How accurate is GPTZero?
GPTZero uses perplexity and burstiness analysis to estimate AI authorship, but like all AI detectors it is probabilistic and can produce false positives or negatives, so results should not be treated as absolute proof.
Does GPTZero offer an API?
Yes, API access is available on the Professional plan for developers who want to integrate detection directly into their own products.
What happened with the Superhuman acquisition?
In June 2026, workplace productivity company Superhuman announced it was acquiring GPTZero, integrating its AI-detection technology into Superhuman's broader product line.