Best OTDefend Alternatives in 2026
The top OTDefend alternatives are Dragos Platform, Armis Centrix for OT/IoT Security and Nozomi Networks Platform: 15 OT and ICS security monitoring software our editors would look at instead of OTDefend, in our ranking order.
OTDefend: A broad on-premises OT security platform for air-gapped industrial environments. Where it falls short: pricing requires contacting sales or requesting a demo.
Switching from OTDefend? For most ot and ics security monitoring software buyers the best OTDefend alternative is Dragos Platform, built for organizations prioritizing OT threat intelligence. Siemens SINEC Security Monitor offers the most asset limit (100 assets).
Why People Look for an OTDefend Alternative
- Pricing requires contacting sales or requesting a demo
- Windows is the listed platform
- Some hosts may require a Windows endpoint agent beyond network monitoring
Quick Picks by What You Need
- Best overallDragos Platform9.4
Organizations prioritizing OT threat intelligence
Visit Dragos Platform - Most asset limitSiemens SINEC Security Monitor7.6
100 assets
Visit Siemens SINEC Security Monitor
All 15 OTDefend Alternatives, Ranked
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.
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Best forOrganizations prioritizing OT threat intelligence
- Better than OTDefend:
- Editor score 9.4 vs 8.4
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
- Better than OTDefend:
- Editor score 9.3 vs 8.4
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
- Better than OTDefend:
- Editor score 9.2 vs 8.4
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
- Better than OTDefend:
- Editor score 9.1 vs 8.4
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
- Better than OTDefend:
- Editor score 8.9 vs 8.4
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
- Better than OTDefend:
- Editor score 8.7 vs 8.4
Broad OT visibility, protocol inspection, and endpoint protection for industrial environments.
- Passive monitoring
- SIEM integration
- OT asset discovery
8.7/10★★★★☆Visit Kaspersky -
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
OTDefend Alternatives: Common Questions
What is the best alternative to OTDefend?
Dragos Platform: #1 in our OT and ICS Security Monitoring Software ranking, with an editor score of 9.4 out of 10. A broad OT monitoring platform for threat intelligence, vulnerability management, and response.
Why do people look for OTDefend alternatives?
Pricing requires contacting sales or requesting a demo; Windows is the listed platform; Some hosts may require a Windows endpoint agent beyond network monitoring.
Which OTDefend alternative has the most asset limit?
Siemens SINEC Security Monitor, with 100 assets.
How do I switch from OTDefend?
Export your data from OTDefend (most tools have an export in their settings). Sign up for the alternative; start on its free plan or trial if it has one. Import your export and set up the integrations your team relies on. Run both side by side for a short while, then cancel OTDefend.
How to Switch from OTDefend
- Export your data from OTDefend (most tools have an export in their settings).
- Sign up for the alternative; start on its free plan or trial if it has one.
- Import your export and set up the integrations your team relies on.
- Run both side by side for a short while, then cancel OTDefend.
OTDefend vs Each Alternative
| # | Tool | Paid from | Deployment | Passive monitoring | OT asset discovery | Supported protocols | Score |
|---|---|---|---|---|---|---|---|
| 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 | |
| 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 | Claroty xDome | Cloud | Yes | Yes | Modbus | 8.3 | |
| 8 | Radiflow iSID | Hybrid | Yes | Yes | Modbus, CIP, DNP3, IEC 104 | 8.2 | |
| 9 | Honeywell Cyber Insights | On_premises | Yes | Yes | 8.0 | ||
| 10 | 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 | ||
| 11 | EmberOT | On_premises | Yes | Yes | IEC 61850 (MMS/GOOSE/SV), Siemens S7, CIP/ENIP, BACnet, Modbus, DNP3, MQTT | 7.8 | |
| 12 | Rhebo Industrial Protector | On_premises | Yes | Yes | OPC, IEC 60870-5-104, IEC 61850-8-1, DNP3 | 7.7 | |
| 13 | Siemens SINEC Security Monitor | On_premises | Yes | Yes | SNMP, PN-DCP, Siemens S7 Communication (S7Comm), Modbus/TCP, EtherNet/IP | 7.6 | |
| 14 | Rockwell Automation SecureOT Platform | Yes | 7.4 | ||||
| 15 | nNetNDR | On_premises | Yes | Yes | EtherNet/IP, EtherCAT, S7Comm, Modbus | 7.2 |
Head-to-Head
- OTDefend vs Dragos Platform
- OTDefend vs Armis Centrix for OT/IoT Security
- OTDefend vs Nozomi Networks Platform
- OTDefend vs Tenable One OT Exposure
- OTDefend vs Claroty CTD
- OTDefend vs Kaspersky Industrial CyberSecurity Platform
Reviewed by iTechGuides Editors · Editorial team · Updated Nov 2026
Last updated · How we research and update