Contrast Security provides an Application and API Security platform that detects and stops application-layer attacks through in-app sensors embedded directly within running applications. The platform combines Application Detection and Response (ADR) and Application Security Testing (AST) capabilities in a unified solution. The company's approach uses patented in-app sensors that provide real-time visibility and protection from inside applications, rather than operating externally like traditional security tools. This inside-out methodology enables the platform to detect live attacks, identify vulnerabilities, and provide detailed context about application behavior and security events. Contrast Security's product portfolio includes Contrast ADR for attack detection and response, Contrast AST for vulnerability identification and remediation (which encompasses Assess for interactive application security testing, SCA for software composition analysis, and Scan for static analysis), and Contrast One for managed runtime security services. The platform serves multiple teams including SecOps, AppSec, developers, and CISOs across industries such as technology, financial services, healthcare, and insurance. Customers include organizations like Citizens Bank, Backbase, AARP, and UTIMCO. The company was co-founded by Jeff Williams, who also helped create OWASP and the OWASP Top 10. Contrast Security is backed by investors including Acero, Battery Ventures, General Catalyst, and Warburg Pincus.