Grammarly parent Superhuman buys AI detector GPTZero

Superhuman Inc., the company formerly known as Grammarly, said today it has agreed to acquire GPTZero Inc., the startup whose detection tools tell teachers, editors and hiring managers when a piece of writing came from a machine.

The acquisition price was not disclosed.

The acquisition is arguably ironic. Grammarly spent years building tools that help people write with artificial intelligence. Now, under its new Superhuman name, it is buying the company best known for catching that same AI output. The rebrand in October came as Grammarly pushed past grammar correction into a wider productivity platform.

Superhuman calls the purchase part of an authenticity layer, its term for tools that show where content came from and whether to trust it. GPTZero will be built into Superhuman Go, the company’s AI assistant, which Superhuman says works across 1 million apps and websites.