SAN FRANCISCO — The spread of the coronavirus has meant feast or famine for technology start-ups. While many are cutting staff and slashing costs as they reel from the outbreak’s fallout, others have experienced a surge in demand.

One of the lucky ones is Notion, a workplace productivity start-up based in San Francisco, whose tools help people organize and track their work. With more people working remotely now and turning to such products, new customer sign-ups hit a new high for Notion in recent weeks.

That allowed the start-up to garner new funding. On Wednesday, Notion said it raised $50 million from Index Ventures and other investors that valued it at $2 billion. Notion had previously been valued at $800 million.

The fund-raising was completed in 36 hours last week after the virus pushed Ivan Zhao, Notion’s founder and chief executive, and Akshay Kothari, Notion’s chief operating officer, to rethink their previous position of not relying too much on venture capital.