Superhuman acquires GPTZero to fuse AI writing and AI detection at scale

Superhuman, the AI productivity platform formerly known as Grammarly, acquired AI text-detection startup GPTZero on June 23, 2026. Terms were not disclosed, but GPTZero reports 19 million registered users and around $30 million in annual recurring revenue, with all 30 employees and both co-founders joining Superhuman to lead authenticity efforts.