Tetragon vs Fidelis Security: 2026 Comparison
Tetragon is a free extended detection and response tool. Fidelis Security is a commercial extended detection and response tool by Fidelis Security. Compare features, ratings, integrations, and community reviews side by side to find the best extended detection and response fit for your security stack.
CST VerdictBased on our analysis of NIST CSF 2.0 coverage, core features, integrations, company size fit, here is our conclusion:
Teams running Kubernetes clusters who need visibility into system calls and process behavior without agent overhead should start with Tetragon; its eBPF foundation catches runtime anomalies at kernel level while staying free and open-source, with 4,476 GitHub stars reflecting active adoption among infrastructure-first shops. The real value is enforcement,not just logging,which means you can block suspicious syscalls in real time rather than alerting after the fact. Skip this if your threat model centers on supply chain or pre-execution detection; Tetragon is strongest on runtime containment, weakest on the Govern function.
Mid-market and enterprise teams drowning in alert fatigue will find real value in Fidelis Security's deep session inspection and AD-aware network detection, which cut false positives by correlating endpoint and network signals that most XDR platforms treat separately. The platform covers all four NIST Detect and Respond functions with particular strength in continuous monitoring and incident analysis through 300+ forensic attributes and automated response capabilities. Skip this if you need a lightweight, cloud-native XDR; Fidelis is built for organizations with the infrastructure to run hybrid deployments and the analyst headcount to operationalize deception strategies like poisoned data and decoys.
