@fastify/rate-limit vs Traceable AppSec: Side-by-Side Comparison (2026)

@fastify/rate-limit: A low overhead rate limiter for your routes..

Traceable AppSec: Platform for API & app security with discovery, testing, and protection. built by Harness. Core capabilities include Automatic API discovery and inventory, API vulnerability detection and compliance risk assessment, Security testing built from real and replayed traffic..

Both serve the API Security market but differ in approach, feature depth, and target audience.

@fastify/rate-limit is open-source with 588 GitHub stars. Traceable AppSec is developed by Harness. Vendor maturity, funding stage, and team size can be important factors when evaluating long-term viability and support quality.

@fastify/rate-limit and Traceable AppSec serve similar API Security use cases: both are API Security tools. Key differences: @fastify/rate-limit is Free while Traceable AppSec is Commercial, @fastify/rate-limit is open-source. Review the feature comparison above to determine which fits your requirements.