• Grammarly is buying Superhuman to grow its AI toolset.
• The deal follows a $1B raise and a move beyond grammar.

Grammarly is acquiring Superhuman, an email productivity app, as it moves to build a broader set of AI tools for the workplace. Executives from both companies confirmed the deal in an interview with Reuters.

The two San Francisco-based firms didn’t share how much the deal is worth. Superhuman, once known for its invite-only model, was last valued at $825 million in 2021. It currently brings in around $35 million a year.

This deal comes after Grammarly raised $1 billion from General Catalyst. The funding gives it room to grow beyond its core grammar tools and into a wider set of AI-powered products. Grammarly, founded in 2009, has more than 40 million daily users and makes over $700 million in annual revenue. The company is also considering a name change as part of its shift toward workplace software.

Superhuman has raised over $110 million from firms like IVP and Andreessen Horowitz. It focuses on helping users get through their inboxes faster using AI. According to the company, users send and reply to emails more quickly — and the share of messages written using its AI tools has increased fivefold in the last year. But it now faces more competition, as Google, Microsoft, and others add similar features to their platforms.

“Email continues to be the dominant communication tool for the world. Professionals spend something like three hours a day in their inboxes. It’s by far the most used work app, foundational to any productivity suite,” said Shishir Mehrotra, CEO of Grammarly.

Mehrotra called Superhuman “the obvious leading innovator in the space.”

Grammarly sees Superhuman as a piece of its larger AI plan. A company study found that some users are already ready for AI agents that can take on basic work tasks. According to the data, 44% want help with admin work, 39% with team coordination, and 36% with writing strategy-focused messages. While many professionals are already using AI in some form, 66% expect it to triple their productivity in five years. Some industry leaders expect a tenfold increase.

Last year, Grammarly bought startup Coda to start building these kinds of tools. Mehrotra, who also co-founded Coda, said email was the next step.

As part of the deal, Superhuman CEO Rahul Vohra will join Grammarly, along with more than 100 employees.

“The Superhuman product, team, and brand will continue,” Mehrotra said. “It’s a very well-used product by tens of thousands of people, and we want to see them continue to make progress.”

Vohra said the acquisition gives Superhuman access to more resources and will help the team invest further in AI. He also mentioned plans to expand into calendars, task tools, and collaboration features.

Both executives see a future where Grammarly’s AI agents are integrated into Superhuman. The idea is to give users a way to pull information from across their emails, docs, and digital tools — saving time on research, writing, and response handling.

That vision puts Grammarly in direct competition with larger tech firms like Salesforce, along with newer startups building similar tools for office use.