Glassdoor.com provides statistics about salary levels for different job titles at popular companies world-wide.

The service is available initially for a limited number of salary queries, after which it requires users to sign up before seeing additional data. Due to this, Glassdoor resembles a wiki where users specify their salary level in order to access statistics about what others declared.

The site can be very useful in salary negotiations as it provides a baseline (based on a given company name, job title and location) that can be used during the interview process with a prospective employer. Its traffic averages around 1 million unique visitors each month.

The company has been established in 2007; a public beta version was launched in June 2008. It is headquartered in Sausalito, California, United States, and it was founded by Richard Barton, Robert Hohman and Tim Besse. Nowadays the Glassdoor team has more than 50 employees. The company previously raised more than $22 million dollars from its founders, Sutter Hill Ventures, Benchmark Capital, and Battery Ventures.