Software testing platform BrowserStack has secured $200 million in Series B funding at a $4 billion valuation. The round was led by BOND, with participation from Insight Partners and existing investor Accel. The investment will support BrowserStack’s strategic acquisitions, expansion of its product offerings, and continued scale and growth.

BrowserStack’s products help developers build bug-free software for the 5 billion internet users accessing websites and mobile applications through millions of combinations of digital environments – devices, browsers, operating systems, and versions.

BrowserStack’s platform is used by developers in over half of the Fortune 500. Its customers include leaders such as Google, Amazon, Microsoft, Twitter, Tesco, IKEA, Spotify, Expedia, and Trivago.

“We are going to double-down on solving new developer problems in the space of DevOps testing,” said Ritesh Arora, co-founder, and CEO of BrowserStack. “Our recent acquisition of Percy, a visual testing platform, was just the start. We will accelerate the rate at which we take new products to market through acquisitions and investment in our Product and Engineering teams. We want to achieve our vision of becoming the testing infrastructure for the internet.”

In the last three years, BrowserStack has more than tripled its employee base to 750+ across seven countries and opened ten new data centers worldwide.