Sandboxie Plus vs Subgraph Citadel / Subgraph OS: Side-by-Side Comparison (2026)

Sandboxie Plus: Open-source sandbox isolation software for running untrusted apps on Windows. built by Sandboxie Plus. Core capabilities include Sandbox-based application isolation, Support for 32-bit and 64-bit Windows NT-based OS, Prevents permanent modification of local or mapped drives..

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.

Sandboxie Plus differentiates with Sandbox-based application isolation, Support for 32-bit and 64-bit Windows NT-based OS, Prevents permanent modification of local or mapped drives. Subgraph Citadel / Subgraph OS differentiates with 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.

Sandboxie Plus is developed by Sandboxie Plus. Subgraph Citadel / Subgraph OS is developed by Subgraph. Vendor maturity, funding stage, and team size can be important factors when evaluating long-term viability and support quality.

Sandboxie Plus and Subgraph Citadel / Subgraph OS serve similar Workload Protection use cases: both are Workload Protection tools, both cover Isolation, Open Source, Virtualization. Review the feature comparison above to determine which fits your requirements.