A task-management and note-taking app maker called Notion Labs is raising $10 million at a paper valuation of $800 million in what it calls an “angel round,” according to a person with knowledge of the matter. Notion is part of a crowded field of “productivity” tools designed for business use that have drawn intense interest from investors.

COO Akshay Kothari confirmed the fundraising in an interview with The Information. He said the only new investor in the round was Daniel Gross, a former partner at startup incubator Y Combinator. He joined initial angel investors in Notion such as longtime early-stage investor and entrepreneur Elad Gil; Aydin Senkut from Felicis Ventures, Ram Shriram of Sherpalo Ventures, Josh Kopelman from First Round Capital, and Lachy Groom, an early Stripe employee.