Providing usability services such as heuristic evaluation and usability testing, based in Finland.

User experience consulting firm that specializes in usability testing, user experience research and design, based in Illinois, USA.

Automated feedback system for collecting web usability and performance data, based in Washington, USA.

A user-centered design firm specializing in remote usability testing and ethnographic research, based in California, USA.

User performance testing services, based in Florida, USA.

Provides website evaluations and usability testing, based in North Carolina, USA.

Web site usability testing and newsletter conversion checkups, based in Pennsylvania, USA.

Offers to test web sites on people and applies insights from cognitive science for usability problems, based in the United Kingdom.

Professional usability and user centered design consultancy based in Oregon, USA.

User experience testing, consulting and design. Offices in Singapore, Malaysia, Vancouver and the United Arab Emirates.