Headquartered in San Antonio, TX, Apex Software is a business applications developer for the real estate valuation market. The first APEX desktop application was introduced to the real estate appraiser market in the 1980's. By 1992, the APEX Sketch Library was considered the industry standard by all reasonable accounts. This was due in part to Apex's commitment to establish a standard communication protocol that allowed data to be shared with other appraisal software programs.