Grammarly — maker of the popular AI productivity tool — says it will acquire Superhuman, an AI-native email app that helps users save time on electronic communications. The purchase price was not disclosed. The acquisition aims to accelerate Grammarly’s evolution into an all-around AI productivity assistant that does more than improve syntax and offers a full complement of apps and agents. The San Francisco-based company, which launched in 2009, last year acquired Coda and its suite of document and spreadsheet software. Grammarly says it now has “an ‘AI superhighway’ that delivers writing agents to users across more than 500,000 applications and websites.”

Grammarly has raised more than $1.5 billion in funding since launch, the majority of it from General Catalyst, which announced its investment in May.

Coupled with the cash infusion, the acquisitions suggest Grammarly is getting ready for a major marketing push in its ambition to take on the likes of multipurpose productivity giants Microsoft and Google.

CNET reports “the company is working on a name change that sells it as more than just a writing improvement tool,” suggesting that rather than go head-to-head with the class leaders, it may try “to position itself as the company that sells the next layer on top of workplace software.”

Email is “the number one use-case for Grammarly customers,” according to CNET. “Email isn’t just another app; it’s where professionals spend significant portions of their day, and it’s the perfect staging ground for orchestrating multiple AI agents simultaneously,” Grammarly CEO Shishir Mehrotra said in a blog post announcing the deal.

Superhuman Labs is a venture-backed startup whose popular email client works with Gmail and Outlook. “It provides dozens of shortcuts designed to help users navigate message archives more efficiently,” notes SiliconANGLE, citing integrations with customer relationship management (CRM) platforms that “allow salespeople to access deal data without leaving the interface.”

A Superhuman blog post suggests the company’s software helps people respond to email twice as fast as they could before, saving more than four hours each week.

A Grammarly study indicates that “workers are ready for agentic AI, with power users seeing opportunities for AI to handle tasks autonomously, including agentic administrative support (44 percent), internal collaboration and coordination (39 percent), and strategic communications (36 percent).”

While AI has been increasingly embraced as a knowledge-worker productivity tool, Grammarly sees big growth ahead, with 66 percent of professionals expecting a 3x increase in productivity within five years, according to a Superhuman report.