CyberOwl Medulla vs GRASSMARLIN: Side-by-Side Comparison (2026)
Features, pricing, ratings, and pros & cons — compared head-to-head.
CyberOwl Medulla is a commercial operational technology asset discovery tool by CyberOwl. GRASSMARLIN is a free operational technology asset discovery tool. Compare features, ratings, integrations, and community reviews side by side to find the best operational technology asset discovery fit for your security stack.
CST VerdictBased on our analysis of NIST CSF 2.0 coverage, core features, company size fit, deployment model, here is our conclusion:
Maritime operators managing mixed legacy and modern vessel fleets will find CyberOwl Medulla essential for IMO 2021 compliance without ripping out existing systems; the platform monitors operational technology assets across distributed vessels while surfacing cyber risk in terms board members actually care about. Deployment is cloud-based with no requirement to replace onboard systems, and the vendor's continuous monitoring focus (NIST DE.CM) means anomalies get flagged before they become incidents. This tool assumes you're already managing cybersecurity as a fleet-wide problem rather than ship-by-ship; buyers expecting traditional IT network visibility or integration with enterprise SOCs will find Medulla too specialized.
Operations teams defending critical infrastructure without dedicated ICS/SCADA visibility should start with GRASSMARLIN; its passive network mapping gives you topology sight-lines without touching production systems, which matters when downtime costs six figures per hour. The tool is free and runs on commodity hardware, so deployment friction is nearly zero for teams of any size. The tradeoff is real: GRASSMARLIN maps what exists but doesn't actively hunt for misconfigurations or lateral movement, so it's a foundation layer, not a standalone defense.
