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GRASSMARLIN is a free operational technology asset discovery tool. Nozomi Networks Nozomi Smart Polling is a commercial operational technology asset discovery tool by Nozomi Networks. Compare features, ratings, integrations, and community reviews side by side to find the best operational technology asset discovery fit for your security stack.
Based on our analysis of NIST CSF 2.0 coverage, core features, company size fit, deployment model, here is our conclusion:
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.
Nozomi Networks Nozomi Smart Polling
Mid-market and enterprise operations teams managing OT/IoT environments where passive discovery leaves blind spots will get the most from Nozomi Networks Nozomi Smart Polling; active polling finds non-communicating devices and firmware patch status that network traffic alone cannot surface. The tool integrates directly with Guardian's passive baseline, meaning you're adding surgical interrogation to existing visibility rather than bolting on another silo. Skip this if your OT footprint is small enough that passive discovery already covers your critical assets, or if you lack the network segmentation to safely execute active polling without production risk.
Passively maps and visually displays ICS/SCADA network topology for network security
Active polling add-on for OT/IoT asset discovery and configuration data
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Common questions about comparing GRASSMARLIN vs Nozomi Networks Nozomi Smart Polling for your operational technology asset discovery needs.
GRASSMARLIN: Passively maps and visually displays ICS/SCADA network topology for network security..
Nozomi Networks Nozomi Smart Polling: Active polling add-on for OT/IoT asset discovery and configuration data. built by Nozomi Networks. headquartered in United States. Core capabilities include Active polling of OT and IoT devices, Agentless asset discovery, Operating system and firmware detection..
Both serve the Operational Technology Asset Discovery market but differ in approach, feature depth, and target audience.
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