Cloud-based performance testing developer SOASTA has secured a $12-million investment round led by The Entrepreneurs’ Fund, with participation from prior investors Canaan Partners, Formative Ventures, and Pelion Venture Partners.

The company already boasts 3,000 customers, including leaders in retailing, financial services, media, telecommunications, consumer packaged goods and technology. The influx of funds will be used to accelerate the company’s international expansion and toward investments in the burgeoning mobile testing market.

SOASTA’s CloudTest Platform tests the performance of web and mobile applications at scale. The company recently added test for building and executing complex functional tests. The free version, CloudTest Lite, offers functional testing and performance testing for up to 100 virtual users at no cost.

The cloud-based testing market is increasingly clouded of late, with many existing players and a slew of new entrants heating up the space. But GigaOm called SOASTA “the granddaddy of cloud testing” and quoted the company’s CEO

Tom Lounibos on the company’s distinction:

“CloudTest, which is installed at over 3,000 companies worldwide, has changed the web and mobile test market forever by reducing the time to test from (days into minutes), scale of test from (hundreds to millions of virtual users), and making it affordable to test by turning a manual process into an automated process reducing cost for corporations (from [multiple] millions into a SaaS-based solution costing hundreds of dollars per test). SOASTA customers include Verizon, Netflix, Target, and the Gilt Groupe have access to nearly 300,000 cloud-based test servers worldwide.”