Tenable One OT Exposure vs OTDefend

Tenable One OT Exposure9.1Visit OOTDefend8.4Visit

Higher score Tenable One OT Exposure #4 in OT and ICS Security Monitoring Software 9.1/10 Pricing on request ✓ 3 of 3 features Contact Tenable

vs

O OTDefend #7 in OT and ICS Security Monitoring Software 8.4/10 Pricing on request ✓ 3 of 3 features Contact OTDefend

• Tenable One OT Exposure fits best

  Teams needing OT exposure and vulnerability management

• OTDefend fits best

  Air-gapped OT environments

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Side by side

Feature	Tenable One OT Exposure 9.1/10 Visit ↗	OOTDefend 8.4/10 Visit ↗
At a glance
Editor score	9.1	8.4
Ranking	#4 in OT and ICS Security Monitoring Software	#7 in OT and ICS Security Monitoring Software
Best for	Teams needing OT exposure and vulnerability management	Air-gapped OT environments
Pricing model	Paid	Paid
Starting price	—	Pricing on request
Free plan	Not checked yet	Not checked yet
Free trial	—	—
Deployment	Cloud, Self-hosted	Self-hosted
Platforms	Web	Windows
Support	Docs	Email · 24/7
Integrations	6 integrations	20 integrations
Built for	Mid-market, Enterprise	Mid-market, Enterprise
Features Tenable One OT Exposure 3/3 · OTDefend 3/3
Passive monitoring	✓	✓
OT asset discovery	✓	✓
SIEM integration	✓	✓
Specs
Deployment	Not checked yet	On_premises
Supported protocols	Modbus, Modbus UMAS, Modbus MODICON, CIP, PROFINET, DNP3, IEC 60870-5-104, MMS, S7/S7+, IEC 61850	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
Asset limit	Not checked yet	Not checked yet
Our review
Pros	Passive inspection plus Safe Active Querying supports OT asset visibility VPR-based vulnerability management prioritizes risk across discovered assets Integrates with SIEM, SOAR, firewall, and ticketing platforms	Supports passive deep-packet inspection and automatic OT asset profiling Maps industrial networks to topology and Purdue zones Connects with SIEM, EDR, firewall, ticketing and threat-intelligence tools
Cons	Pricing requires working with a Tenable representative Assets are licensed by detected IP address Safe Active Querying uses native controller protocols	Pricing requires contacting sales or requesting a demo Windows is the listed platform Some hosts may require a Windows endpoint agent beyond network monitoring
Our verdict	Tenable One OT Exposure monitors industrial control system environments for cyber threats, configuration changes, vulnerabilities, and anomalous activity. It is designed for security teams and OT engineers responsible for converged IT/OT… Read the review →	OTDefend is an on-premises cybersecurity platform for operational technology and industrial control system environments. It is designed for industrial facilities and critical infrastructure operators across energy, manufacturing, water,… Read the review →

Strengths and trade-offs

• Tenable One OT Exposure — where it wins

  • Passive inspection plus Safe Active Querying supports OT asset visibility
  • VPR-based vulnerability management prioritizes risk across discovered assets
  • Integrates with SIEM, SOAR, firewall, and ticketing platforms

  Where it doesn't

  • Pricing requires working with a Tenable representative
  • Assets are licensed by detected IP address
  • Safe Active Querying uses native controller protocols

• OTDefend — where it wins

  • Supports passive deep-packet inspection and automatic OT asset profiling
  • Maps industrial networks to topology and Purdue zones
  • Connects with SIEM, EDR, firewall, ticketing and threat-intelligence tools

  Where it doesn't

  • Pricing requires contacting sales or requesting a demo
  • Windows is the listed platform
  • Some hosts may require a Windows endpoint agent beyond network monitoring

• Tenable One OT Exposure9.1/10 · Pricing on request

  A broad OT security platform combining asset discovery, threat detection, and vulnerability management.

  Contact TenableFull verdict →
• OOTDefend8.4/10 · Pricing on request

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

  Contact OTDefendFull verdict →