What are the best alternatives to GRASSMARLIN?

The most popular alternatives to GRASSMARLIN include Armis Threat Detection and Analysis, Dragos Platform Asset Visibility, Athena Dynamics RAD, Phosphorus xIoT Global Device Network, and Vantelis Data Acquisition Platform. These OT Asset Discovery tools offer similar capabilities and are frequently compared by security professionals evaluating their options.

How many alternatives to GRASSMARLIN are available?

There are 13 alternatives to GRASSMARLIN listed on CybersecTools, all within the OT Asset Discovery category. Each alternative is matched based on shared capabilities, tags, and NIST CSF coverage areas.

Is GRASSMARLIN free or commercial?

GRASSMARLIN is a free OT Asset Discovery tool. You can use it at no cost. Both free and commercial alternatives are available for comparison.

What type of tool is GRASSMARLIN?

GRASSMARLIN is a OT Asset Discovery tool within the broader Cyber-Physical Security category. It is used by security professionals for ot asset discovery capabilities and can be compared against 13 similar tools.

13 Best GRASSMARLIN Alternatives & Competitors (2026)

Armis Threat Detection and Analysis

Commercial

OT Asset Discovery

OT/IoT asset discovery and threat detection platform for industrial environments

Key features: Passive and active asset discovery for OT/IoT devices, Enriched asset inventory with CMDB aggregation and deduplication, Security control gap analysis for EDR and vulnerability scanners, Detection of unusual communications between OT devices and networks, End-of-life and end-of-service operating system identification

View Armis Threat Detection and Analysis|Armis Threat Detection and Analysis alternatives|Compare Armis Threat Detection and Analysis

Dragos Platform Asset Visibility

Commercial

OT Asset Discovery

OT asset discovery and inventory platform for industrial environments

Key features: Automated passive-first asset discovery and classification, Real-time asset inventory with continuous updates, Deep packet inspection of 600+ industrial protocols, Targeted active collection via Dragos Agent, OT-specific vulnerability management with CVSS scoring

View Dragos Platform Asset Visibility|Dragos Platform Asset Visibility alternatives|Compare Dragos Platform Asset Visibility

Athena Dynamics RAD

Commercial

OT Asset Discovery

Remote maritime IT/OT asset discovery & vuln assessment via software agent.

Key features: Remote IT and OT asset discovery via lightweight software agent — no onboard hardware required, Passive network scanning with no observable impact on vessel OT systems (ClassNK certified), Vulnerability assessment and prioritisation for all discovered assets, 50-page detailed report with asset inventory and cybersecurity threat analysis, Transition to 24/7 Managed SOC continuous monitoring using the same agent

View Athena Dynamics RAD|Athena Dynamics RAD alternatives|Compare Athena Dynamics RAD

Phosphorus xIoT Global Device Network

Commercial

OT Asset Discovery

Database of 1M+ xIoT/OT/IoMT device profiles for CPS asset coverage.

Key features: Coverage of over 1 million unique IoT, OT, IIoT, and IoMT device models, Device profiling using a patented 'Genus-Species' classification approach, Support for over 950 device vendors across multiple cyber-physical system categories, Active discovery methodology that does not rely on SPAN port or network traffic analysis, Extensible device coverage with ability to add new device types within hours

View Phosphorus xIoT Global Device Network|Phosphorus xIoT Global Device Network alternatives|Compare Phosphorus xIoT Global Device Network

Vantelis Data Acquisition Platform

Commercial

OT Asset Discovery

Agentless OT data acquisition platform for passive asset & traffic visibility.

Key features: Agentless deployment with no changes to existing OT devices, Passive network traffic capture with zero impact on production, OT asset and communication discovery, Support for legacy and heterogeneous industrial infrastructures, Support for any vendor, protocol, or device generation

View Vantelis Data Acquisition Platform|Vantelis Data Acquisition Platform alternatives|Compare Vantelis Data Acquisition Platform

Redinent Deep Asset Intelligence

Commercial

OT Asset Discovery

Cloud-based IoT/OT asset intelligence engine for device profiling and OEM detection.

Key features: Cloud-based IoT/OT/Industry 4.0 device knowledge base with supplier, risk, and end-of-life data, True OEM detection for white-labeled IoT devices using proprietary algorithms, Multi-layer TCP stack analysis, deep packet inspection, and application layer signature evaluation, Active and passive asset discovery with configurable scan speed and timing, On-the-fly custom signature onboarding for in-house and embedded devices

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Nozomi Networks Nozomi Smart Polling

Commercial

OT Asset Discovery

Active polling add-on for OT/IoT asset discovery and configuration data

Key features: Active polling of OT and IoT devices, Agentless asset discovery, Operating system and firmware detection, Patch status identification, Real-time configuration data collection

View Nozomi Networks Nozomi Smart Polling|Nozomi Networks Nozomi Smart Polling alternatives|Compare Nozomi Networks Nozomi Smart Polling

SAM Intelligence

Commercial

OT Asset Discovery

Network device & service visibility platform for ISPs using device fingerprinting.

Key features: Automatic discovery and mapping of network-connected devices including IoT, Device fingerprinting to identify manufacturer, class, OS, product name, model and sub-model, Monitoring and alerting on new, disconnected, and reconnected devices, Service identification and usage pattern analysis for network-connected devices, Insights on device and service usage trends, replacement cycles, brands, and uptime

View SAM Intelligence|SAM Intelligence alternatives|Compare SAM Intelligence

Best GRASSMARLIN Alternatives & Competitors in 2026

GRASSMARLIN Alternatives and Competitors

Top GRASSMARLIN Alternatives and Competitors at a Glance

All 13 Alternatives & Competitors to GRASSMARLIN

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