Aqua Security Serverless Functions vs FunctionShield: Side-by-Side Comparison (2026)

FunctionShield

Developers building on AWS Lambda or Google Cloud Functions who need to lock down function behavior at runtime should start with FunctionShield; it enforces strict allowlists for system calls, file access, and network connections directly in your code rather than relying on perimeter controls. The free, open-source model (40 GitHub stars, no licensing friction) means you can pilot it in staging without procurement delays. Skip this if you're looking for detection and forensics after a breach; FunctionShield is prevention-only, which is either exactly what you want or a deal-breaker depending on your threat model.