Glassdoor focuses on company reviews from employees, contractors, and other stakeholders. Reviews are more qualitative than quantitative. They often highlight employee opinions on a company’s internal culture, the job interview process, etc.

Source: www.reviewflowz.com

Glassdoor has an interesting history — the site was founded in 2008, after the CEO of Zillow accidentally sent a sheet of his employees' salaries to the public printer instead of his private one, causing him to ask: why do we keep salary information secret? He passed that idea along to one of his former employees who then created Glassdoor.

Source: mashable.com

Glassdoor — Generalist job board with decent coverage of small and large companies. Integrates nicely with Glassdoor’s salary and company reviews products.

Source: medium.com