The short version
SAST analyzes code or compiled artifacts without running the application. DAST tests a running application from the outside. SCA identifies risk in third-party and open-source components. They answer different questions, so mature programs use them together rather than treating them as substitutes.
Where SAST fits
SAST is valuable early in the development lifecycle because it can find code-level patterns before deployment. The practical challenge is tuning, triage, and helping developers understand which findings are meaningful in the application context.
Where DAST fits
DAST evaluates a running application and can reveal weaknesses that only appear once routes, authentication, headers, configuration, and runtime behavior come together. It is especially useful as applications move into test and staging environments.
Where SCA fits
SCA focuses on third-party packages and dependencies. The important work is not just counting CVEs; teams need to understand version, exposure, fix availability, package origin, and whether compensating controls change the actual risk.
A practical program
Use the tools as signals inside a broader process: define coverage, integrate them into delivery workflows, triage intelligently, assign ownership, validate remediation, and track trends. Tooling creates findings; the program turns those findings into risk reduction.
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