Superhuman acquires GPTZero to bolster AI detection capabilities

Superhuman, the email provider that rebranded following Grammarly’s acquisition of the original service last year, has acquired GPTZero, a three-year-old artificial intelligence detection startup. The companies announced the deal on Tuesday, though financial terms were not disclosed.

GPTZero was founded by Princeton graduate Edward Tian as a senior thesis project, with co-founder and chief technology officer Alex Cui, a high school friend of Tian, also joining the acquisition. The startup has raised a total of $13.5 million in funding, including a $3.5 million seed round led by Uncork Capital and a $10 million Series A in June 2024 led by Footwork co-founder Nikhil Basu Trivedi. Other investors in the company include Reach Capital, Jack Altman’s Alt Capital, and Neo.

According to Tian, GPTZero reported over 19 million registered users and $30 million in annual recurring revenue. The founder previously stated in 2024 that the company was profitable, although recent financial performance has not been independently verified in this report. The company’s mission focuses on helping users identify and defend against AI-generated content, often referred to as “AI slop.”

Superhuman already possessed an AI detection tool within its platform prior to this acquisition. A company spokesperson stated that the rationale for acquiring the competitor is that “two AI detectors are better than one,” aiming to strengthen its existing capabilities in the market.

This move follows a similar strategy by Grammarly, whose existing AI detection tool is designed to help users, particularly students, determine if their writing appears AI-generated and to revise it to avoid detection. The acquisition marks a significant consolidation in the niche sector of AI content verification.