BrowserStack, a web and mobile app testing platform, has raised $200 million, led by storied Silicon Valley investor Mary Meeker’s Bond Capital, valuing the San Francisco and Mumbai-based company at $4 billion.

The latest financing has made BrowserStack the most valued software as a service or SaaS company from India overtaking Freshworks which is preparing to go public in the US.

The Mumbai and San Francisco-based company which was till a few years ago bootstrapped, will be the seventh Indian SaaS startup to enter the unicorn club which consists of privately held firms with a valuation of $1 billion or more. Freshworks, Druva, Icertis, Postman, Zenoti and Chargebee are some of the ventures which are part of the coveted group. SoftBank Vision Fund-backed MindTickle, a sales enablement platform, is also close to scooping up $100 million at a $1 billion valuation.

The Indian SaaS sector has caught the eye of global investors, with its ‘build in India for the world’ model that has been viewed as highly cost efficient and scalable.

BrowserStack said it will utilise the funds to scale up in the fast-growing market for cloud-based software testing. It will also use the money to double team size in the next 18 months and make strategic acquisitions.

“The reason to do this round was to benchmark where the business is,” said Nakul Aggarwal, cofounder and chief technology officer of BrowserStack. “We want to be the testing infrastructure of the internet and to do this we need to scale our operations quickly, both in terms of people and infrastructure.”