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 Unified xIoT Security Mgmt Platform, and Phosphorus xIoT Global Device Network. These Operational Technology 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 22 alternatives to GRASSMARLIN listed on CybersecTools, all within the Operational Technology 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 Operational Technology 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 Operational Technology Asset Discovery tool within the broader OT Security category. It is used by security professionals for operational technology asset discovery capabilities and can be compared against 22 similar tools.

Every GRASSMARLIN Alternative & Competitor in 2026

Armis Threat Detection and Analysis

Commercial

Operational Technology 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

Operational Technology 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

Operational Technology 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 Unified xIoT Security Mgmt Platform

Commercial

Operational Technology Asset Discovery

Continuous monitoring & management platform for IoT, OT, IoMT, and IIoT devices.

Key features: Intelligent Active Discovery for xIoT devices (IoT, OT, IoMT, IIoT), Continuous monitoring for environmental and configuration drift, Detection and alerting for rogue, unknown, and prohibited devices, Firmware update management and vulnerability remediation, Default credential detection and password hardening

View Phosphorus Unified xIoT Security Mgmt Platform|Phosphorus Unified xIoT Security Mgmt Platform alternatives|Compare Phosphorus Unified xIoT Security Mgmt Platform

Phosphorus xIoT Global Device Network

Commercial

Operational Technology 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

Nozomi Networks Nozomi Smart Polling

Commercial

Operational Technology 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

Armis Centrix™ Medical Device Security

Commercial

Operational Technology Asset Discovery

Medical device security platform for healthcare asset visibility & protection

Key features: Complete asset visibility across medical devices and IT/IoT systems, Asset location and patient proximity monitoring, Clinical Impact Score for patient safety prioritization, Device utilization monitoring and tracking, Encrypted and unencrypted traffic monitoring

View Armis Centrix™ Medical Device Security|Armis Centrix™ Medical Device Security alternatives|Compare Armis Centrix™ Medical Device Security

Armis Centrix™ for Medical Device Security

Commercial

Operational Technology Asset Discovery

Medical device security platform for healthcare asset monitoring & compliance

Key features: Passive non-invasive device monitoring, Medical device and IT asset discovery, Asset Intelligence Engine with global baseline comparison, Device behavior analysis and anomaly detection, Vulnerability management for medical devices

View Armis Centrix™ for Medical Device Security|Armis Centrix™ for Medical Device Security alternatives|Compare Armis Centrix™ for Medical Device Security

Every GRASSMARLIN Alternative & Competitor in 2026

GRASSMARLIN Alternatives and Competitors

Top GRASSMARLIN Alternatives and Competitors at a Glance

All 22 Alternatives & Competitors to GRASSMARLIN

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