Leading Application Security Testing (AST) platforms that support both Static Application Security Testing (SAST) and Dynamic Application Security Testing (DAST) include Checkmarx One, Veracode, OpenText Fortify, Snyk, GitHub Advanced Security, HCL AppScan, Invicti (formerly Netsparker), Rapid7 InsightAppSec, SonarQube, and GitLab Ultimate Security, all designed to identify vulnerabilities in application code and running systems throughout the software development lifecycle. These platforms differ in vulnerability detection accuracy and testing approaches, support for multiple programming languages and frameworks, and their ability to integrate with CI/CD pipelines, IDEs, and DevSecOps workflows to automate security testing during development and deployment. They also vary in reporting quality, remediation guidance, compliance and governance features, and scalability for cloud-native applications or large enterprise environments. Ease of adoption for developers and security teams, along with automation capabilities and centralized vulnerability management, are key differentiators, and overall their effectiveness depends on how well they embed security testing into development processes to identify and mitigate application-layer vulnerabilities before production release.