Prelude Security Control Monitoring is a security control validation platform that provides real-time visibility into the state of an organization's security tools and end-user devices. It operates agentlessly using read-only integrations with existing device, network, and identity security platforms. The platform aggregates and normalizes asset data — including users, inboxes, and devices — from across an organization's security stack into a unified inventory. It continuously monitors this inventory against expected control configurations and policies, surfacing gaps such as unmanaged devices and configuration drift. Controls are automatically mapped to MITRE ATT&CK, allowing teams to overlay threat intelligence onto their control coverage to understand which techniques and threats present the most risk. The platform delivers notifications to service desks and communication channels when gaps or policy failures are detected. Prelude is designed to replace manual processes such as jumping between security consoles and reconciling data across spreadsheets. It targets use cases including compliance evidence gathering, cyber insurance requirements, and ongoing security assurance. The product offers a free trial and is aimed at security teams that need continuous visibility into their security posture without deploying additional agents.