Vivaldi Technologies AS is a Norwegian software development company, most known for its creation of the Vivaldi Browser. Headquartered in Oslo, Norway, it was founded in 2013 by Jon von Tetzchner and Tatsuki Tomita. Tetzchner was one of the founders, and formerly the CEO, of Opera Software, a software company which developed the web browser Opera. About 20 former Opera employees joined him at Vivaldi Technologies. In January 2017, the company had 35 employees. As of April 2025, the company has listed 60 employees.