Comparison
Hardened is not stateless.
A hardened, immutable, or read-only OS still retains users, logs, config, and state, it just constrains them. The ZeroTrustOS retains nothing. That distinction is the whole point.
Side by side
Immutable / hardened OS vs. stateless ZeroTrustOS
Scylos · stateless
Immutable / hardened
Retains users & profiles
Retains logs & config
Fixed image to maintain & patch
Image drift over time
Session rebuilt clean every time
An immutable OS preserves a fixed system image; Scylos preserves nothing. There is no read-only baseline to maintain or update, every session is rebuilt clean, so there is no image drift and no image to patch.
See it on your hardware
See the stateless endpoint on your own hardware.
Flash an idle machine into a live endpoint and run your real workloads. You buy no hardware and sign nothing.