Based in San Francisco, Calif., the company was founded as ZenPayroll in 2011. It opened an office in Denver, Colo., in July and received $60 million in funding in April. Announced plans for the Denver office included the hiring of 100 employees immediately and bringing the total there to 1,000 over the next few years.

The health benefits services include assisting businesses in the selection of health plans and it described its workers' compensation program as a pay-as-you-go service.

Gusto is priced at $59 per month for a company with five employees, a base of $29 per month plus $6 per month for each person. The price includes all Gusto features.