Stack provides SaaS-based takeoff and estimation software for the construction industry. The solution allows users to plan and estimate materials, equipment, and labor required for construction projects. Stack sells to SMBs in the construction industry, including trade contractors in verticals such as interior finishes, concrete & masonry, roofing, and landscaping. Takeoff software helps contractors estimate the list of materials and quantities required to complete a project. The list is generated from analysis of a blueprint or other design document. Estimation software helps contractors determine their bids for projects by factoring the cost of labor, materials, markups, etc. needed to complete the project.