Grammarly has acquired Superhuman, the high-speed email client once known for its exclusivity and $350-a-year subscription, as it expands its footprint in AI-native productivity software. The deal brings Superhuman’s 100-person team including founder and CEO Rahul Vohra into Grammarly, and adds a tightly built email product to a company best known for writing assistance.
Superhuman, last valued at $825 million, has raised over $110 million from backers including Andreessen Horowitz, IVP, and Tiger Global. Its core pitch has been speed and efficiency helping professionals move through email twice as fast. The company reports $35 million in annual revenue and a user base of around 100,000.
Grammarly, by contrast, operates at a different scale. With more than 40 million daily users and over $700 million in revenue, its software runs quietly behind the scenes across 500,000 apps and websites from Google Docs to Gmail. But despite the ubiquity, its ambitions have become more overt over the past year.
Since acquiring collaborative workspace Coda in 2024 and naming its co-founder Shishir Mehrotra as CEO, Grammarly has accelerated its shift toward building an end-to-end platform for knowledge work anchored in AI agents that do more than just revise sentences. With Superhuman, Grammarly now has a native email surface, arguably the most time-consuming work tool of all to expand those capabilities.
“Professionals spend something like three hours a day in their inboxes,” Mehrotra said in an interview with Reuters. “It’s by far the most used work app, foundational to any productivity suite.”
The two companies have been circling the same problem for years: email is broken, bloated, and still indispensable. Superhuman approached it with speed and minimalism. Grammarly is now approaching it with infrastructure the kind that routes AI across half a million apps and a growing ecosystem of task-specific agents that can summarize, schedule, rewrite, and reason.
Superhuman has already leaned heavily into AI. In the past year, the company says the percentage of emails composed using its AI tools has increased fivefold. Ninety-four percent of weekly active users use its AI features. Now, Grammarly plans to plug its agents directly into the Superhuman experience starting with triaging inboxes, drafting full replies in the user’s tone, surfacing context from documents, and eventually coordinating with other agents across a user’s workflow.
The deal also gives Superhuman a financial and engineering lifeline. Competing with Microsoft, Google, and even Apple in the email space has long been a losing game. Superhuman carved out a loyal niche, but feature parity especially with AI was becoming harder to maintain. Vohra has said the acquisition gives the company access to “significantly greater resources” and will help it expand into calendars, task management, and broader collaboration tools.
“Email is the main communication tool for billions of people worldwide and the number-one use case for Grammarly customers,” Vohra said. “By joining forces with Grammarly, we will invest even more in the core Superhuman experience, as well as create a new way of working where AI agents collaborate across the communication tools that we all use every day.”
For Grammarly, it’s not just about expanding into new features. The acquisition reflects a more opinionated view on how AI should be delivered: not as chatbots, not bolted-on assistants, but as embedded agents that work across apps, quietly performing high-context tasks in the background.
While many vendors are still layering generative AI onto legacy tools, Grammarly is trying to rewire the stack. With Coda and now Superhuman, the company is putting together the foundational surfaces where its agents can live documents, inboxes, calendars and operate with context across them all.
Microsoft and Google and startups like Notion and Rewind are also building toward multi-agent workflows. But Grammarly now controls two key surfaces: writing and email that professionals use most. Whether that’s enough to build an agent-powered productivity suite remains to be seen, but the building blocks are in place.
“Email isn’t just another app,” Mehrotra said. “It’s the perfect staging ground for orchestrating multiple AI agents simultaneously.”
