Based on building and room dimensions the app automatically calculates the material required and calculates labor costs based on four different methods. It can also be used by homeowners to estimate the paint material needed for a project. Painting Contractor Estimating & Billing Tool is a complete estimating, quotation and bid app for all types of painting & decorating contractors. In-App purchase required to add additional invoices. IMPORTANT: The Mac App License includes access to standard app features and the ability to add seven invoices. Based on the iOS app that has thousands of users over the last seven years. The ONLY Painting Contractor specific app available for Mac.