Bastille-Linux vs Subgraph Citadel / Subgraph OS: Side-by-Side Comparison (2026)

Bastille-Linux: Bastille-Linux is a system hardening program that proactively configures the system for increased security and educates users about security settings..

Subgraph Citadel / Subgraph OS: Immutable, compartmentalized Linux OS for adversarial computing environments. built by Subgraph. Core capabilities include Read-only immutable base OS protected by dm-verity cryptographic integrity verification, Unlimited isolated user realms with separate process, network, and filesystem namespaces, Container-based realm isolation using Linux namespaces and cgroups..

Both serve the Workload Protection market but differ in approach, feature depth, and target audience.

Bastille-Linux and Subgraph Citadel / Subgraph OS serve similar Workload Protection use cases: both are Workload Protection tools, both cover Security Hardening. Review the feature comparison above to determine which fits your requirements.