chatgpt-detector
(2)
Pangram Labs
Pangram Labs builds AI-content detection software that identifies text written by models like ChatGPT, Claude, Gemini and Grok. Founded in 2024 by Stanford classmates Max Spero and Bradley Emi, the New York-based startup claims third-party-verified accuracy above 99.9% and a roughly 1-in-10,000 false-positive rate, positioning itself as the reliable alternative to perplexity-based detectors. Its detector, browser extensions, API and LMS integrations are used across education, publishing, enterprise trust & safety and platform moderation.
GPTZero
GPTZero is a New York-based AI startup that builds tools to detect AI-generated text and verify human authorship. Launched in January 2023 by Princeton senior Edward Tian, it grew from a viral side project into a profitable company serving over 10 million users and 100+ organizations across education, hiring, publishing, and legal. Its mission is to restore trust and transparency to writing on the internet as large language models flood it with machine-made text.