Decision Framework

Choosing between DAST and IAST—or implementing both—requires systematic evaluation of multiple factors. Application portfolio composition significantly influences decisions. Diverse technology stacks might favor DAST's universal applicability, while standardized environments benefit from IAST's deeper integration. Legacy applications often require DAST due to IAST compatibility limitations.

Development practices guide tool selection. Organizations with mature DevOps practices and comprehensive test automation gain maximum value from IAST. Traditional development approaches might better suit DAST's periodic scanning model. Agile teams often implement both, using IAST during sprints and DAST for release validation.

Security maturity influences implementation approach. Organizations beginning their application security journey might start with DAST due to simpler deployment and immediate results. As security practices mature, adding IAST provides deeper coverage and better developer integration. Advanced security programs use both tools strategically, leveraging their complementary strengths.