Web and mobile testing platform BrowserStack has raised $200mn at a valuation of $4bn. BrowserStack has now overtaken FreshWorks as the most valued SaaS company from India. It will also become the 7th unicorn SaaS firm in the country. Fresh funds will be used for cloud testing, increasing the product suite, and doubling the present team size of 800 in the next 18 months. It will also add more data centers to its network, which is at present 15.