Cornerstone PM is the all-in-one home builder software platform with built-in AI agents, designed for small-to-mid production home builders managing 5-200+ homes per year. It replaces Buildertrend, CoConstruct, JobTread, NEWSTAR, BuildPro, and MarkSystems with a unified system covering scheduling, sales, purchasing, design center, permitting, and AI-powered material takeoffs. Native AI agents (Foreman AI with 47 skills, Blueprint AI for PDF takeoffs) and a public REST API (59 endpoints, 14 webhook events) with Bring Your Own Agent support. Starts at $149/mo with unlimited users. No implementation fees.