@fastify/helmet vs Source Defense Platform: Side-by-Side Comparison (2026)

@fastify/helmet: A Fastify plugin that implements HTTP security headers through a wrapper around the helmet library to protect web applications from common vulnerabilities..

Source Defense Platform: Client-side security platform protecting against JavaScript-based threats. built by Source Defense. Core capabilities include External scanning and monitoring for client-side threats, AI-driven algorithm detection and alerting, Real-time JavaScript sandboxing and isolation..

Both serve the Runtime Application Self-Protection market but differ in approach, feature depth, and target audience.

@fastify/helmet is open-source with 453 GitHub stars. Source Defense Platform is developed by Source Defense. Vendor maturity, funding stage, and team size can be important factors when evaluating long-term viability and support quality.

@fastify/helmet and Source Defense Platform serve similar Runtime Application Self-Protection use cases: both are Runtime Application Self-Protection tools, both cover Web Security. Key differences: @fastify/helmet is Free while Source Defense Platform is Commercial, @fastify/helmet is open-source. Review the feature comparison above to determine which fits your requirements.