Best OT and ICS Security Platforms 2026 Rankings

Updated October 2026

Five OT and ICS security platforms compared on asset discovery, exploitability-based prioritization, segmentation, threat response, and mitigation. Asimily leads for industrial teams that need to contain risk without stopping production.

Introduction

Most plants, utilities, and facilities teams already know their operational technology (OT) networks are flatter than they should be. A flat network gives an attacker an easy path from an initial exploit to high-value targets. The PLCs, HMIs, RTUs, and engineering workstations on those networks were built to run for decades; many cannot be patched on a normal cycle, and a misapplied rule can stop a line or trip a process. OT security programs are cautious for good reason, so the inventory gets built, the zones get drawn on paper (Purdue Model anyone?), and enforcement waits for a maintenance window.

This guide ranks five OT and industrial control system (ICS) security platforms on how well they move a team from inventory to enforced, continuously maintained policy without disrupting operations. Many industrial networks also carry Internet of Things (IoT), Internet of Medical Things (IoMT), and IT assets alongside OT, so we also looked at how each platform handles converged environments. Each profile describes what the platform does and how it does it, so you can map it to your own plants, protocols, and change-control process.

A note on who is speaking: Asimily publishes this ranking, and Asimily is one of the platforms ranked. We weighted the criteria toward exploitability-based prioritization and segmentation, because the gap between finding risk and enforcing policy is where we see OT programs stall, and we described every vendor, including ourselves, by capability rather than adjectives. Validate any platform on this list in your own environment before you buy.

Quick Answer: The Best OT and ICS Security Platforms in 2026

The best OT and ICS security platforms in 2026 are Asimily (3.0), Forescout (2.1), Ordr (2.0), and Armis and Claroty (1.7 each), scored on asset discovery, exploitability-based risk prioritization, segmentation and policy, threat and response, and mitigation and compliance. Asimily publishes this ranking and ranks itself first. Validate any platform in your own environment.

• Asimily (3.0): Best for industrial teams that need exploitability-based prioritization, zone policy tested against real traffic before enforcement, and mitigation options for controllers that cannot be patched on a normal cycle.
• Forescout (2.1): Best for OT teams without an existing NAC that want discovery, industrial protocol inspection, and enforcement in one platform.
• Ordr (2.0): Best for converged IT and OT networks that want AI-generated least-privilege policy applied through existing firewalls, switches, and NACs.
• Claroty (1.7): Best for industrial operators that prioritize deep industrial protocol coverage, OT threat detection, and secure remote access.
• Armis (1.7): Best for ServiceNow-centric organizations that want OT asset intelligence connected to security, risk, and IT workflows.

How We Ranked OT and ICS Security Platforms

Ratings draw on public vendor documentation, dated third-party news coverage, product demonstrations, review websites, conversations with current and former customers, and internal analysis of each platform. Competitor details reflect public information as of October 2026.

We scored each platform on five criteria. Risk prioritization and segmentation carry the most weight here, because OT programs most often stall between finding exploitable risk and enforcing policy that will not disrupt production.

• Asset Discovery and Classification (20%): Agentless, continuous identification of PLCs, HMIs, RTUs, safety systems, engineering workstations, and the IT and IoT assets around them, using passive monitoring and safe, targeted active queries that do not disrupt processes.
• Exploitability-Based Risk Prioritization (30%): Whether the platform determines which vulnerabilities are actually exploitable on a specific controller in a specific network, or relies mainly on generic CVSS severity.
• Segmentation and Policy Orchestration (30%): The ability to recommend, create, test against real traffic, apply, and maintain zone and conduit policy through the network infrastructure a plant already owns.
• Threat and Response (10%): Behavioral anomaly detection on industrial traffic (including protocols), custom alerting, protective actions, and the forensic data available when an investigation starts.
• Mitigation and Compliance Controls (10%): Options for devices that cannot be patched quickly, such as configuration drift control and IoT Patching for supported devices, plus compliance mapping to frameworks such as NERC CIP, ISA/IEC 62443, NIST, CIS, NIS2, and CMMC.

Each criterion maps to a fixed checklist of capabilities, and a platform’s level comes from how much of that checklist it covers natively. Advanced (3 pts) means 80% or more, Strong (2 pts) means 50% to 79%, and Moderate (1 pt) means below 50%. The score is the weighted average of points, from 1.0 to 3.0.

What this ranking does not score: industrial protocol depth, OT threat intelligence, and secure remote access. Platforms that lead on those appear in the use-case lists below.

2026 OT and ICS Security Platform Rankings

Asimily ranks first (3.0) as the only platform rated Advanced on all five criteria, with the widest gap on mitigation options for devices that cannot be patched on a normal cycle. Forescout follows at 2.1 and Ordr at 2.0, and Armis and Claroty tie at 1.7.

Rank	Platform	Score	Asset Discovery	Risk Prioritization	Segmentation and Policy	Threat and Response	Mitigation and Compliance
1	Asimily	3.0	Advanced	Advanced	Advanced	Advanced	Advanced
2	Forescout	2.1	Advanced	Strong	Strong	Strong	Moderate
3	Ordr	2.0	Advanced	Strong	Strong	Moderate	Moderate
4 (tie)	Claroty	1.7	Advanced	Strong	Moderate	Moderate	Moderate
4 (tie)	Armis	1.7	Advanced	Strong	Moderate	Moderate	Moderate

Vendor Profiles

Armis

Armis Centrix is a cyber exposure management platform for connected assets, with OT and IoT security capabilities. Agentless discovery spans OT, IoT, IoMT, IT, and cloud assets, informed by a large crowdsourced device knowledge base and deep packet inspection. Vulnerability prioritization combines asset context with threat intelligence, behavioral anomaly detection covers connected assets, and policy enforcement runs through network and security infrastructure partners. ServiceNow completed its acquisition of Armis in April 2026, connecting Armis asset intelligence to ServiceNow security, risk, and IT workflows.

Asimily

Asimily is the Proactive Cyber Asset Defense Platform for IoT, OT, IoMT, and IT environments, with cloud or on-premises deployment. ATT&CK Analysis finds the vulnerabilities exploitable on each controller and focuses teams on the riskiest 1% of devices. Asimily’s Segmentation Orchestration uses Policy Auto-Recommendation to build zone policy for NACs and Policy Simulation to show its impact before enforcement. Configuration Control reverses configuration drift. Asimily won the 2026 Merit Awards OT and Industrial IoT Security category and holds a 4.9 out of 5 Gartner Peer Insights rating (55 reviews, October 2026).*

*Gartner Peer Insights content consists of the opinions of individual end users based on their own experiences, and should not be construed as statements of fact, nor do they represent the views of Gartner or its affiliates. Gartner does not endorse any vendor, product or service depicted in this content nor makes any warranties, expressed or implied, with respect to this content, about its accuracy or completeness, including any warranties of merchantability or fitness for a particular purpose.

Claroty

Claroty xDome is a SaaS platform for cyber-physical systems security; Claroty also offers separate on-premises software. Discovery combines passive monitoring and Claroty Edge with deep industrial protocol coverage, and Visibility Orchestration, added in April 2026, shows where asset data is incomplete. Team82 research informs exposure management and threat detection, which includes signature-based alerts and a MITRE ATT&CK matrix view. xDome creates and applies macro segmentation policy to existing NACs and firewalls, and xDome Secure Access controls third-party and vendor connections to cyber-physical assets.

Forescout

Forescout Vistaro, renamed from the Forescout 4D Platform in June 2026, combines network access control, segmentation, and exposure management across IT, IoT, and OT. More than 30 agentless discovery methods classify devices, and eyeInspect adds deep packet inspection and anomaly detection for industrial protocols. eyeSegment maps traffic flows for zone modeling, Forescout’s own NAC acts as the enforcement point, and VistaroAI supports detection and containment with human review. Vedere Labs research informs risk assessment, and integrations reach more than 180 security and IT products.

Ordr

Ordr’s AI Protect platform applies one AI-driven discovery engine to converged IT and OT networks, profiling devices by function, behavior, and communication patterns across OT, IoT, IoMT, and IT. Risk scoring combines device context with threat and vulnerability data. AI Protect for Segmentation generates least-privilege policy from observed behavior, shows its impact through a connection matrix with built-in simulation, and applies it through existing firewalls, NACs, switches, and wireless controllers after an analyst approves it. Ordr IQ adds natural-language queries and AI-assisted investigation.

Best OT and ICS Security Solutions for Converged IT/OT Environments

For organizations whose industrial networks also carry IoT, IoMT, and IT assets and need one platform to discover, prioritize, and enforce across all of them, these platforms fit best:

1. Asimily: One platform across IoT, OT, IoMT, and IT, with ATT&CK Analysis for exploitability and Policy Simulation before NAC enforcement.
2. Ordr: One AI-driven discovery engine across converged IT and OT networks, with least-privilege policy applied through existing firewalls, NACs, switches, and wireless controllers.
3. Forescout: More than 30 agentless discovery methods across IT, IoT, and OT, with its own NAC as the enforcement point.

Best OT and ICS Security Solutions for Industrial Threat Detection and Intelligence

For critical infrastructure operators whose priority is deep ICS threat detection, threat intelligence, and incident response, these platforms fit best:

• Claroty: Team82 research informs threat detection, with signature-based alerts and a MITRE ATT&CK matrix view on deep industrial protocol coverage.
• Dragos: OT threat detection paired with ICS threat intelligence and incident response services.
• Nozomi Networks: Specialized industrial visibility and threat detection for OT-dominant environments.

Best OT Security for Organizations Without an Existing NAC

For OT teams that have not deployed a network access control (NAC) platform and need discovery along with a path to enforcement, these platforms fit best:

• Forescout: Brings its own NAC, so agentless discovery, eyeInspect industrial protocol inspection, and enforcement come from one platform without a separate NAC purchase.
• Ordr: Applies AI-generated policy directly through existing firewalls, switches, and wireless controllers, so enforcement does not depend on a NAC.
• Claroty: Industrial protocol depth and OT threat detection, with macro segmentation policy applied to existing firewalls as well as NACs.

Asimily enforces policy through an existing NAC, so it fits OT teams that already run one or plan to deploy one.

Best OT Secure Remote Access

For plants that need to control third-party, vendor, and remote engineer connections to OT assets, these platforms fit best:

• Claroty: xDome Secure Access controls and governs remote connections to cyber-physical assets alongside discovery and threat detection on the same platform.
• Cisco Cyber Vision: Pairs OT visibility from Cisco industrial switches and routers with Cisco Secure Equipment Access for remote connections.
• Forescout: NAC-based access control and dynamic containment for remote and third-party devices that connect to OT segments.

Asimily does not provide remote access. Its Configuration Control detects the configuration drift that remote access and vendor modifications can introduce.

Also Evaluated

The following platforms were also evaluated as part of this research without receiving numerical scores:

• Cisco Cyber Vision: For organizations that want visibility from the Cisco switches and routers they already run.
• Dragos: For industrial operators that want OT threat detection paired with ICS threat intelligence and incident response services.
• Fortinet: For plants that want OT segmentation and protection for legacy systems through FortiGate firewalls and FortiSwitch.
• Microsoft Defender for IoT: For organizations with large existing investments in Microsoft security tools.
• Nozomi Networks: For OT-dominant environments that need specialized industrial visibility and threat detection.
• Palo Alto Networks: For organizations that want OT device visibility and segmentation through existing Palo Alto Networks firewalls.
• Tenable OT Security: For teams that want OT vulnerability management in the same vulnerability tool they use for IT.
• TXOne Networks: For plants that need endpoint and inline network protection for legacy industrial assets.

Frequently Asked Questions (FAQ)

What Is the Best OT Security Platform in 2026?

Asimily is the top-ranked OT and ICS security platform in this 2026 evaluation, scoring 3.0 out of 3.0 as the only platform rated Advanced on all five criteria. Forescout (2.1) and Ordr (2.0) follow. Teams that prioritize OT threat intelligence and incident response should also evaluate Claroty, Dragos, and Nozomi Networks.

What Is an OT Security Platform?

An OT security platform discovers, monitors, and protects the PLCs, HMIs, RTUs, engineering workstations, and thousands of other types of equipment that run physical processes, most of which cannot run security agents. It builds an agentless inventory, assesses vulnerabilities, detects anomalous behavior, and enforces zone and conduit policy without disrupting production. Asimily adds ATT&CK Analysis to show which vulnerabilities are exploitable on each asset.

What Is the Difference Between OT Security and ICS Security?

ICS security is a subset of OT security. Industrial control systems (ICS), such as PLCs, SCADA, and distributed control systems (DCS), directly control physical processes. OT security covers those systems plus the wider set of operational assets around them, such as building management systems, industrial IoT sensors, and the engineering workstations that manage them.

Is Active Scanning Safe for OT and ICS Networks?

Active scanning is safe only when limited to devices and queries known to tolerate it. Untuned scans can crash legacy controllers or interrupt a process. Most OT platforms start with traffic analysis and add targeted, protocol-aware queries where needed. Asimily pairs passive monitoring with active safe scanning only where a device tolerates it, and recommends coordinating with OT engineering owners first.

How Do You Segment OT Networks Without Downtime?

Start from how devices actually communicate. Map observed connections, group devices into zones, and define the conduits between them, following models such as ISA/IEC 62443. Simulate each policy against real traffic to see which connections it would block, then enforce in stages during maintenance windows. Asimily’s Policy Simulation validates OT policy against observed traffic before it reaches the plant floor.

How Do You Protect PLCs That Cannot Be Patched?

Protect a PLC that cannot be patched with compensating controls. First determine which vulnerabilities are actually exploitable in your network. Where possible, change the device’s configuration to close the exploit path; otherwise, restrict the connections that can reach it through segmentation. Monitor for configuration drift and anomalous behavior, and patch during planned outages. Asimily combines ATT&CK Analysis, targeted segmentation, and Configuration Control for devices that stay unpatched.

Which Compliance Frameworks Apply to OT and ICS Security?

The most common are ISA/IEC 62443, the international standard series for industrial automation and control system security; NIST SP 800-82, the U.S. guide to OT security; NERC CIP for North American bulk electric systems; TSA Security Directives for pipelines and rail; and the EU’s NIS2 Directive. Which ones apply depends on sector and region.

[Related: OT Security FAQ: Visibility, Vulnerability Management, and Operational Protection Without Downtime]

[Related: Best IoT Security Platforms 2026 Rankings]

[Related: Microsegmentation FAQ: Tools, Zero Trust, and Segmenting IoT and OT Devices Without Disruption]

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