The Best OT and ICS Security Monitoring Software in 2026
We researched OT and ICS security monitoring software from official vendor websites, including pricing pages, plan tables, and product documentation. Rankings reflect the category’s core job, value for money, and verified features such as asset visibility, passive monitoring, deployment options, and industrial protocol coverage.
Our top picks
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Top ranked
Dragos Platform#1 of 199.4/10A broad OT monitoring platform for threat intelligence, vulnerability management, and response.
Pricing on request
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Runner-up
9.3/10A broad agentless platform for discovering, monitoring, and prioritizing OT/IoT risk.
Pricing on request
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#3 ranked
Nozomi Networks Platform#3 of 199.2/10Broad monitoring, discovery, anomaly detection, and integrations for mixed OT and IoT estates.
Pricing on request
Advertiser disclosure: iTechGuides is reader-supported. We may earn a commission when you click some links. How we rank.
The full ranking 19 tools, best first
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Best forOrganizations prioritizing OT threat intelligence
A broad OT monitoring platform for threat intelligence, vulnerability management, and response.
- Passive monitoring
- SIEM integration
- OT asset discovery
9.4/10★★★★★Visit Dragos -
Best forEnterprise OT/IoT teams needing broad coverage
A broad agentless platform for discovering, monitoring, and prioritizing OT/IoT risk.
- Passive monitoring
- SIEM integration
- OT asset discovery
9.3/10★★★★★Visit Armis -
Best forLarge mixed OT, IoT, and enterprise environments
Broad monitoring, discovery, anomaly detection, and integrations for mixed OT and IoT estates.
- Passive monitoring
- SIEM integration
- OT asset discovery
9.2/10★★★★★Visit site -
Best forTeams needing OT exposure and vulnerability management
A broad OT security platform combining asset discovery, threat detection, and vulnerability management.
- Passive monitoring
- SIEM integration
- OT asset discovery
9.1/10★★★★★Contact Tenable -
Best forOn-premises OT security teams
A broad on-premises OT monitoring platform for asset visibility, detection, and exposure management.
- Passive monitoring
- SIEM integration
- OT asset discovery
8.9/10★★★★☆Visit Claroty -
Best forIndustrial sites needing broad protocol support
Broad OT visibility, protocol inspection, and endpoint protection for industrial environments.
- Passive monitoring
- SIEM integration
- OT asset discovery
8.7/10★★★★☆Visit Kaspersky -
Best forAir-gapped OT environments
A broad on-premises OT security platform for air-gapped industrial environments.
- Passive monitoring
- SIEM integration
- OT asset discovery
8.4/10★★★★☆Contact OTDefend -
Best forCloud-managed OT and CPS monitoring
A broad cloud platform for passive OT monitoring, asset intelligence, and threat detection.
- Passive monitoring
- SIEM integration
- OT asset discovery
8.3/10★★★★☆Visit Claroty -
Best forOT teams monitoring PLC behavior and work orders
A broad OT monitoring platform for tracking assets, PLC behavior, threats, and work orders.
- Passive monitoring
- SIEM integration
- OT asset discovery
8.2/10★★★★☆Visit Radiflow -
Best forHoneywell-centered industrial environments
A Honeywell-focused OT monitoring solution for asset discovery, detection, and vulnerability management.
- Passive monitoring
- SIEM integration
- OT asset discovery
8.0/10★★★★☆Visit Honeywell -
Best forOT teams needing centralized asset and policy control
A centralized console for discovering, monitoring, and managing industrial OT security.
- Passive monitoring
- SIEM integration
- OT asset discovery
7.9/10★★★★☆Visit TXOne Networks -
Best forOffline and air-gapped OT monitoring
Passive, offline-capable OT monitoring with asset discovery, detection, and security integrations.
- Passive monitoring
- SIEM integration
- OT asset discovery
7.8/10★★★★☆Visit EmberOT -
Best forFocused passive OT network monitoring
Focused passive monitoring for OT asset visibility, anomaly detection, and incident response.
- Passive monitoring
- SIEM integration
- OT asset discovery
7.7/10★★★★☆Visit Rhebo -
Best forSiemens industrial environments
A Siemens-focused OT monitor combining asset discovery, detection, vulnerability mapping and SIEM forwarding.
- Passive monitoring
- SIEM integration
- OT asset discovery
7.6/10★★★★☆Visit Siemens -
Best forRockwell-aligned OT governance programs
A Rockwell-aligned OT platform for discovery, risk prioritization, change control, and compliance.
- SIEM integration
- OT asset discovery
7.4/10★★★★☆Visit Rockwell -
Best forFocused OT network detection deployments
A focused, passive monitoring platform for OT asset visibility and threat detection.
- Passive monitoring
- OT asset discovery
7.2/10★★★★☆Visit nNetNDR -
Best forNetwork infrastructure monitoring outside OT security
A focused network monitoring tool, but an expensive fit for OT security programs.
6.2/10★★★☆☆Visit NetPol -
Best forSmall businesses needing low-cost endpoint security
Affordable endpoint protection with EDR and ransomware disruption for small businesses.
From $3/user/mo (annual) · 30-day trial Our Microsoft Defender for Business verdict → Visit Microsoft6.0/10★★★☆☆Visit Microsoft -
Best forCisco network operations teams
A Cisco-focused network management system with strong automation and assurance capabilities.
5.7/10★★★☆☆Visit Cisco
No tools match those filters.
Compare at a glance
| # | Tool | Free plan | Paid from | Deployment | Passive monitoring | OT asset discovery | Supported protocols | Score |
|---|---|---|---|---|---|---|---|---|
| 1 | Dragos Platform | — | — | — | Yes | Yes | 600+ industrial and IT protocols | 9.4 |
| 2 | Armis Centrix for OT/IoT Security | — | — | — | Yes | Yes | S7Comm, CIP, SNMP, BACnet, Modbus, WMI, HTTP, DNP3, IEC 60870-5-104, Profinet | 9.3 |
| 3 | Nozomi Networks Platform | — | — | — | Yes | Yes | Modbus, IEC 61850-8-1 (MMS), EtherNet/IP, PROFINET, BACnet | 9.2 |
| 4 | Tenable One OT Exposure | — | — | — | Yes | Yes | Modbus, Modbus UMAS, Modbus MODICON, CIP, PROFINET, DNP3, IEC 60870-5-104, MMS, S7/S7+, IEC 61850 | 9.1 |
| 5 | Claroty CTD | — | — | On_premises | Yes | Yes | Modbus, DNP3, CIP, OPC UA, 450+ industrial protocols | 8.9 |
| 6 | Kaspersky Industrial CyberSecurity Platform | — | — | On_premises | Yes | Yes | ABB SPA-Bus; Allen-Bradley EtherNet/IP; BACnet; BECKHOFF ADS/AMS; CODESYS V2/V3 Gateway; DNP3; Emerson DeltaV; General Electric SRTP/EGD; IEC 60870-5-101/104; IEC 61850 GOOSE/MMS/Sampled Values; Mitsubishi MELSEC System Q; Modbus TCP; OMRON FINS; OPC DA; OPC UA Binary; PROFINET IO; Schneider Electric UMAS; Siemens Industrial Ethernet; Siemens S7comm/S7comm-plus; TASE.2; Yokogawa Vnet/IP; Honeywell Experion PKS/PlantCruise; Honeywell ControlEDGE 900 | 8.7 |
| 7 | OTDefend | — | — | On_premises | Yes | Yes | Modbus (TCP and RTU), S7comm, DNP3, EtherNet/IP, IEC-104, IEC 61850, PROFINET, EtherCAT, POWERLINK, CC-Link IE, OPC UA, BACnet, FINS, MELSEC, HART-IP | 8.4 |
| 8 | Claroty xDome | — | — | Cloud | Yes | Yes | Modbus | 8.3 |
| 9 | Radiflow iSID | — | — | Hybrid | Yes | Yes | Modbus, CIP, DNP3, IEC 104 | 8.2 |
| 10 | Honeywell Cyber Insights | — | — | On_premises | Yes | Yes | — | 8.0 |
| 11 | TXOne EdgeOne | — | — | — | Yes | Yes | Modbus, EtherNet/IP, CIP, FINS, S7Comm/S7Comm+, SECS/GEM, IEC 61850-MMS, IEC-104, and 180+ additional industrial protocols | 7.9 |
| 12 | EmberOT | No | — | On_premises | Yes | Yes | IEC 61850 (MMS/GOOSE/SV), Siemens S7, CIP/ENIP, BACnet, Modbus, DNP3, MQTT | 7.8 |
| 13 | Rhebo Industrial Protector | — | — | On_premises | Yes | Yes | OPC, IEC 60870-5-104, IEC 61850-8-1, DNP3 | 7.7 |
| 14 | Siemens SINEC Security Monitor | No | — | On_premises | Yes | Yes | SNMP, PN-DCP, Siemens S7 Communication (S7Comm), Modbus/TCP, EtherNet/IP | 7.6 |
| 15 | Rockwell Automation SecureOT Platform | — | — | — | — | Yes | — | 7.4 |
| 16 | nNetNDR | — | — | On_premises | Yes | Yes | EtherNet/IP, EtherCAT, S7Comm, Modbus | 7.2 |
| 17 | NetPol | No | A$1,000/unit/mo | Hybrid | — | — | SNMP v2c, CDP, LLDP, SSH, syslog | 6.2 |
| 18 | Microsoft Defender for Business | No | $3/user/mo | — | — | — | — | 6.0 |
| 19 | Cisco Catalyst Center | — | — | — | — | — | — | 5.7 |
Head-to-head All 28 comparisons →
- Dragos Platform vs Armis Centrix for OT/IoT Security
- Dragos Platform vs Nozomi Networks Platform
- Dragos Platform vs Tenable One OT Exposure
- Dragos Platform vs Claroty CTD
- Dragos Platform vs Kaspersky Industrial CyberSecurity Platform
- Dragos Platform vs OTDefend
- Dragos Platform vs Claroty xDome
- Armis Centrix for OT/IoT Security vs Nozomi Networks Platform
- Armis Centrix for OT/IoT Security vs Tenable One OT Exposure
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How we rank OT and ICS security monitoring software
Every tool on this page was researched by iTechGuides Editors from its official website — pricing pages, plan tables and product documentation. We rank on how well each one does this category's core job, what the free or entry plan includes, and where it falls short. Where we have enough verified facts, the score out of 10 is a rubric — job fit, value and how much we could verify — shown with its breakdown on every tool's page; a tool we have not verified enough to score yet shows its rank without a number. Scores are re-checked when a product changes its plans. Read the full editorial policy, or submit a tool we missed.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Last updated · How we research and update