The Best OT and ICS Security Monitoring Software in 2026

• 19 tools ranked
• Updated Nov 2026
• Researched from official sources
• Compare tools in this directory
• Sponsor this list

Dragos Platform is the top-ranked OT and ICS security monitoring software of the 19 we ranked (9.4/10), best for organizations prioritizing OT threat intelligence. Armis Centrix for OT/IoT Security is the runner-up (9.3/10). 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.

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

The full ranking 19 tools, best first

1. 1
   DP
   Dragos Platform 9.4

   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

   Pricing on request Our Dragos Platform verdict → + Compare Visit DragosFor vendors Sponsor this spot · #1 · $149/mo →
   9.4/10★★★★★

   Visit Dragos
2. 2
   AC
   Armis Centrix for OT/IoT Security 9.3

   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

   Pricing on request Our Armis Centrix for OT/IoT Security verdict → + Compare Visit ArmisFor vendors Sponsor this spot · #2 · $99/mo →
   9.3/10★★★★★

   Visit Armis
3. 3
   
   Nozomi Networks Platform 9.2

   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

   Pricing on request Our Nozomi Networks Platform verdict → + Compare Visit siteFor vendors Sponsor this spot · #3 · $79/mo →
   9.2/10★★★★★

   Visit site
4. 4
   
   Tenable One OT Exposure 9.1

   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

   Pricing on request Our Tenable One OT Exposure verdict → + Compare Contact TenableFor vendors Sponsor this spot · #4 · $69/mo →
   9.1/10★★★★★

   Contact Tenable
5. 5
   
   Claroty CTD 8.9

   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

   Pricing on request Our Claroty CTD verdict → + Compare Visit ClarotyFor vendors Sponsor this spot · #5 · $59/mo →
   8.9/10★★★★☆

   Visit Claroty
6. 6
   KI
   Kaspersky Industrial CyberSecurity Platform 8.7

   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

   Pricing on request Our Kaspersky Industrial CyberSecurity Platform verdict → + Compare Visit Kaspersky
   8.7/10★★★★☆

   Visit Kaspersky
7. 7
   O
   OTDefend 8.4

   Best forAir-gapped OT environments

   A broad on-premises OT security platform for air-gapped industrial environments.

   • Passive monitoring
   • SIEM integration
   • OT asset discovery

   Pricing on request Our OTDefend verdict → + Compare Contact OTDefend
   8.4/10★★★★☆

   Contact OTDefend
8. 8
   
   Claroty xDome 8.3

   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

   Pricing on request Our Claroty xDome verdict → + Compare Visit Claroty
   8.3/10★★★★☆

   Visit Claroty
9. 9
   
   Radiflow iSID 8.2

   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

   Pricing on request Our Radiflow iSID verdict → + Compare Visit Radiflow
   8.2/10★★★★☆

   Visit Radiflow
10. 10
    
    Honeywell Cyber Insights 8.0

    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

    Pricing on request Our Honeywell Cyber Insights verdict → + Compare Visit Honeywell
    8.0/10★★★★☆

    Visit Honeywell
11. 11
    
    TXOne EdgeOne 7.9

    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

    Pricing on request Our TXOne EdgeOne verdict → + Compare Visit TXOne Networks
    7.9/10★★★★☆

    Visit TXOne Networks
12. 12
    
    EmberOT 7.8

    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

    Pricing on request Our EmberOT verdict → + Compare Visit EmberOT
    7.8/10★★★★☆

    Visit EmberOT
13. 13
    
    Rhebo Industrial Protector 7.7

    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

    Pricing on request Our Rhebo Industrial Protector verdict → + Compare Visit Rhebo
    7.7/10★★★★☆

    Visit Rhebo
14. 14
    
    Siemens SINEC Security Monitor 7.6

    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

    Our Siemens SINEC Security Monitor verdict → + Compare Visit Siemens
    7.6/10★★★★☆

    Visit Siemens
15. 15
    
    Rockwell Automation SecureOT Platform 7.4

    Best forRockwell-aligned OT governance programs

    A Rockwell-aligned OT platform for discovery, risk prioritization, change control, and compliance.

    • SIEM integration
    • OT asset discovery

    Pricing on request Our Rockwell Automation SecureOT Platform verdict → + Compare Visit Rockwell
    7.4/10★★★★☆

    Visit Rockwell
16. 16
    N
    nNetNDR 7.2

    Best forFocused OT network detection deployments

    A focused, passive monitoring platform for OT asset visibility and threat detection.

    • Passive monitoring
    • OT asset discovery

    Pricing on request Our nNetNDR verdict → + Compare Visit nNetNDR
    7.2/10★★★★☆

    Visit nNetNDR
17. 17
    N
    NetPol 6.2

    Best forNetwork infrastructure monitoring outside OT security

    A focused network monitoring tool, but an expensive fit for OT security programs.

    7-day trial Our NetPol verdict → + Compare Visit NetPol
    6.2/10★★★☆☆

    Visit NetPol
18. 18
    
    Microsoft Defender for Business 6.0

    Best forSmall businesses needing low-cost endpoint security

    Affordable endpoint protection with EDR and ransomware disruption for small businesses.

    30-day trial Our Microsoft Defender for Business verdict → + Compare Visit Microsoft
    6.0/10★★★☆☆

    Visit Microsoft
19. 19
    CC
    Cisco Catalyst Center 5.7

    Best forCisco network operations teams

    A Cisco-focused network management system with strong automation and assurance capabilities.

    Pricing on request Our Cisco Catalyst Center verdict → + Compare Visit Cisco
    5.7/10★★★☆☆

    Visit Cisco

No tools match those filters.

Compare at a glance

#	Tool	Paid from	Deployment	Passive monitoring	OT asset discovery	Supported protocols	Score
1	DPDragos Platform			Yes	Yes	600+ industrial and IT protocols	9.4
2	ACArmis 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	KIKaspersky 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	OOTDefend		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		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		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	NnNetNDR		On_premises	Yes	Yes	EtherNet/IP, EtherCAT, S7Comm, Modbus	7.2
17	NNetPol	A$1,000/unit/mo	Hybrid			SNMP v2c, CDP, LLDP, SSH, syslog	6.2
18	Microsoft Defender for Business	$3/user/mo					6.0
19	CCCisco Catalyst Center						5.7

Head-to-head All 28 comparisons →

• DPACDragos Platform vs Armis Centrix for OT/IoT Security
• DPDragos Platform vs Nozomi Networks Platform
• DPDragos Platform vs Tenable One OT Exposure
• DPDragos Platform vs Claroty CTD
• DPKIDragos Platform vs Kaspersky Industrial CyberSecurity Platform
• DPODragos Platform vs OTDefend
• DPDragos Platform vs Claroty xDome
• ACArmis Centrix for OT/IoT Security vs Nozomi Networks Platform
• ACArmis Centrix for OT/IoT Security vs Tenable One OT Exposure

Buyer's guide

How much do OT and ICS security monitoring software products cost? Of the 19 we ranked, 0 have a free plan and 1 publishes a paid starting price. The lowest is $3/user/mo (Microsoft Defender for Business). Prices checked September 2026.

Which OT and ICS security monitoring software products have a free plan? None of the 19 we ranked lists a free plan.

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 Nov 2026

Last updated 14 Nov 2026 · How we research and update