Cylera IoT Security Platform vs GRASSMARLIN: Side-by-Side Comparison (2026)
Features, pricing, ratings, and pros & cons — compared head-to-head.
Cylera IoT Security Platform is a commercial operational technology asset discovery tool by Cylera. 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:
Mid-market and enterprise operations teams drowning in unmanaged IoT device sprawl should start here; Cylera IoT Security Platform discovers and classifies devices passively without agent deployment, then generates network segmentation policies automatically instead of forcing you to manually map your OT environment. Its agentless approach covers all five NIST CSF 2.0 asset management and risk assessment functions, which matters because most IoT tools excel at finding devices but fail at actually reducing attack surface. Skip this if your organization needs integrated IT/OT threat response or deep forensic capabilities; Cylera prioritizes discovery and segmentation over investigation tools.
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.
