O

OTDefend

Paid#7 of 19 in OT and ICS Security Monitoring SoftwareIoT Security Software

OTDefend: A broad on-premises OT security platform for air-gapped industrial environments. Ranked #7 of 19 in OT and ICS Security Monitoring Software by our editors (8.4/10); pricing: Pricing on request; best for air-gapped OT environments.

8.4/10★★★★☆Editor score

Contact OTDefend

At a glance

• Editor score
  8.4 / 10
• Pricing
  Pricing on request
• Best for
  Air-gapped OT environments
• Deployment
  On_premises
• Founded
  2025 · Ankara, Turkey
• Facts checked
  20 Sep 2026

• 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

Our verdict on OTDefend

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, and oil and gas. Its monitoring approach is passive, with deep-packet inspection, automatic asset discovery, vulnerability detection, protocol inspection, intrusion detection, session auditing, and topology mapping. Air-gapped environments are a central fit, supported by distributed sensors, high availability, and data-diode sensor support.

The platform covers a broad set of industrial protocols, including Modbus, S7comm, DNP3, EtherNet/IP, IEC-104, IEC 61850, PROFINET, EtherCAT, OPC UA, BACnet, FINS, MELSEC, HART-IP, and others. Its security functions include CVE and ICS-CERT matching, protocol-specific and behavioral detection, traffic recording, command auditing, and an offline AI analyst for alarm explanations and response recommendations. A Windows endpoint agent is also available for hosts that cannot be monitored solely through network traffic.

OTDefend is a strong candidate for teams that need passive monitoring across segmented or air-gapped OT networks while connecting operational findings to existing security and service workflows. Integrations include Splunk, IBM QRadar, Syslog/CEF, webhooks, ServiceNow, Jira, TAXII/STIX, Zeek, CrowdStrike Falcon, Microsoft Defender, SentinelOne, Palo Alto Cortex XDR, Fortinet FortiGate, Palo Alto Networks, and Check Point. The vendor directs prospects to request a demo or contact sales rather than presenting a self-serve plan structure. Organizations seeking a Windows-listed, on-premises deployment with extensive OT visibility should consider it; teams wanting public tiered pricing or a broader listed platform range may prefer another option.

Questions about OTDefend

What does OTDefend run on? Windows. It runs self-hosted.

What does OTDefend integrate with? 20 integrations, including Splunk, IBM QRadar, Syslog/CEF, Webhook and CrowdStrike Falcon.

Who is OTDefend built for? Mid-market companies and enterprises (our editorial estimate).

Your product? Our editors can test OTDefend in depth and publish a review, labelled as paid · from $149/mo →

OTDefend pricing

OTDefend fact sheet

OTDefend integrations

OTDefend lists 20 integrations on its own site.

• Splunk
• IBM QRadar
• Syslog/CEF
• Webhook
• CrowdStrike Falcon
• Microsoft Defender
• SentinelOne
• Palo Alto Cortex XDR
• Fortinet FortiGate
• Palo Alto Networks
• Check Point
• ServiceNow
• Jira
• TAXII/STIX
• Zeek
• Suricata
• Spicy/ICSNPP
• Microsoft 365
• SMTP
• LDAP/Active Directory

See all OTDefend integrations →

Alternatives to OTDefend

• DPDragos PlatformA broad OT monitoring platform for threat intelligence, vulnerability management, and response.9.4
• ACArmis Centrix for OT/IoT SecurityA broad agentless platform for discovering, monitoring, and prioritizing OT/IoT risk.9.3
• Nozomi Networks PlatformBroad monitoring, discovery, anomaly detection, and integrations for mixed OT and IoT estates.9.2

See all OTDefend alternatives →

OTDefend vs the competition

• ODPOTDefend vs Dragos Platform
• OACOTDefend vs Armis Centrix for OT/IoT Security
• OOTDefend vs Nozomi Networks Platform
• OOTDefend vs Tenable One OT Exposure
• OOTDefend vs Claroty CTD
• OKIOTDefend vs Kaspersky Industrial CyberSecurity Platform

Compare OTDefend with any tool side by side →

Also Ranked In

OTDefend is ranked in 2 of our directories.

• #23IoT Security Software56 tools ranked→

Used OTDefend? Be the first to review it

The editor score above is our own research. What this page doesn't have yet is a reader's view — what you used OTDefend for, what worked and what didn't. No stars are seeded and no review is paid for; an editor reads every one before it appears.

Write a reviewTwo minutes · verified accounts only · read by an editor before it appears

Website

Reviews come only from verified accounts. Sign in or create an account first — your e-mail is never shown.

Your rating

5 stars★4 stars★3 stars★2 stars★1 star★

Title

Your review

0 characters · at least 80, up to 3,000

Pros (optional · one per line)

Cons (optional · one per line)

Your name (shown with your review)

Role (optional)

Company (optional)

How long have you used it?Prefer not to sayLess than a month1–6 months6–12 months1–2 years2+ years

I've used OTDefend myself and this is my honest opinion — nobody paid or asked me to write it.

Send my reviewPosted from your verified account. Reviews appear after an editor reads them, usually within two working days.

Featured on iTechGuides

Reviewed by iTechGuides Editors · Editorial team · Updated Nov 2026

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.

Last updated 14 Nov 2026 · How we research and update