Website and mobile usability testing
UserTesting analyzes the usability of apps and websites. Founded in 2007, the company conducts interviews with thousands of part-time testers around the world. Video footage records the ways that users try to fill up digital shopping carts, operate drop-down menus and related activities. Testers are freelancers who are paid on a per-project basis. The company is January 2015 raised $45.5 million.