Grammarly, the company behind the popular grammar enforcement app of the same name, has acquired the AI-powered Superhuman app as part of its push to build out its business productivity offerings, the company said in a press release today.

In the last few months, Superhuman has released AI-powered features related to scheduling, replies, and categorization. In its announcement, Grammarly said that it wants to build AI agents for emails using Superhuman’s tech. The company said that email remains one of the top use cases for Grammarly.

Grammarly wants to become a productivity platform filled with AI tools, rather than being a tool for checking grammar and spelling.