GPTZero is an AI detection platform that identifies AI-generated and AI-edited text to help educators, journalists, publishers, and organizations preserve content authenticity and adopt AI responsibly. Founded in 2022 by Edward Tian and Alex Cui, the company analyzes signals such as perplexity (how predictable text is to a language model) and burstiness (variation in sentence structure) to flag machine-written passages, and has expanded into writing-integrity tooling, source verification, and an API. By 2024 GPTZero had grown to roughly 4 million users, a 500% ARR increase over six months, and profitability. In June 2024 it raised a $10M Series A led by Footwork VC, with Reach Capital, Uncork, Neo, and Alt Capital, plus angels including former Reuters and New York Times CEOs.