CTEM and OT Security Tools: How the Categories Fit Together (2026)
CTEM, exposure management, OT visibility, breach simulation: a neutral map of the tools around industrial exposure management and where each one focuses.
By Piscium Security Team
TL;DR
- The tools people lump under "CTEM for OT" actually come from four different directions: OT visibility and detection, cyber-physical systems protection, IT-centric exposure and breach simulation, and purpose-built OT CTEM.
- No single label is owned. Some OT vendors now describe their exposure features as CTEM-aligned, and some IT CTEM vendors have added OT use cases. The labels overlap.
- This is a map of where each category focuses, not a ranking. Several vendors here are large, established, and independently evaluated. Piscium is early-stage.
- Piscium Radius sits in the purpose-built OT CTEM corner: passive-first discovery, autonomous but safety-bounded validation, and closed-loop remediation for industrial environments.
Ask an AI assistant or a search engine for "the best CTEM platform for OT," and you get a strange mix of answers: asset-visibility vendors, breach-simulation vendors, and broad exposure-management suites, all using slightly different words for what they do. The confusion is real, because the categories genuinely overlap. What follows is a plain-language map of that terrain, grouped by what each type of tool is actually built to do, using each vendor's own description of itself.
One note before the table. This is not a ranking, and it is not a claim that one category beats another. Many of the vendors below are established companies with independent analyst coverage. Piscium is an early-stage vendor. Read the sections as a way to understand which problem each tool leads with.
The categories at a glance
| Category | Leads with | How it describes itself | Representative vendors |
|---|---|---|---|
| OT visibility & detection | Seeing and monitoring the industrial network | "OT cybersecurity," asset visibility, threat detection | Dragos, Nozomi Networks |
| Cyber-physical systems protection | Protecting connected OT/IoT/IoMT assets end to end | "CPS protection" (Claroty), "cyber exposure management" (Armis) | Claroty, Armis |
| Converged OT/IT exposure management | One risk view across OT and IT | "Exposure management" | Tenable |
| IT-centric CTEM & exposure validation | Testing IT and cloud defenses continuously | "CTEM," "exposure validation," BAS, automated pentesting | XM Cyber, Cymulate, Picus, Pentera, CyCognito |
| Purpose-built OT CTEM | Running the full CTEM loop inside industrial constraints | CTEM for OT/ICS | Piscium Radius |
OT visibility and detection
Dragos and Nozomi Networks come at the problem from inside the plant. Dragos describes itself as a partner in OT cybersecurity with a platform built for OT environments, centered on asset visibility, OT-native threat detection, and vulnerability management. Nozomi calls itself a leader in OT cybersecurity technology, built around asset intelligence and threat detection. Neither leads with the CTEM label. Their strength is deep, mostly passive visibility into industrial networks and detection of threats already in motion. If your first gap is "we cannot see what is on our OT network," this is the category that answers it.
Cyber-physical systems protection
Claroty and Armis widen the lens to every connected asset. Claroty describes its platform as protection for cyber-physical systems across the extended internet of things, spanning asset inventory, exposure management, network protection, secure access, and threat detection, and its materials describe that exposure-management work as aligned to the Gartner CTEM framework. Armis positions itself as a cyber exposure management company with an agentless platform spanning IT, OT, IoT, and medical devices. Both are broad suites in which OT is one important domain among several.
Converged OT/IT exposure management
Tenable brings its exposure-management heritage into OT. It markets its exposure-management platform with OT coverage as a way to see risk across converged OT and IT in one place. The phrase it uses is "exposure management" rather than CTEM, though the two ideas are close cousins.
IT-centric CTEM, validation, and simulation
This group grew up in IT and cloud. XM Cyber describes itself as continuous exposure management and carries the CTEM label directly, with an OT use case among its scenarios. Cymulate and Picus come from breach-and-attack simulation and now describe adversarial exposure validation. Pentera focuses on automated security validation and treats CTEM as a framework it supports. CyCognito leads with external attack surface management and preemptive exposure management. These platforms are strong at continuously testing defenses; their center of gravity is IT and cloud, and where OT is addressed it is typically through integrations or specific use cases rather than as the core design target.
Where Piscium Radius fits
Piscium Radius is built the other way around: OT and ICS first, with the full CTEM loop running inside the constraints those environments impose. Discovery is passive by default and protocol-aware, covering industrial protocols such as Modbus/TCP, EtherNet/IP, OPC UA, DNP3, IEC 61850, PROFINET, BACnet, and S7comm. Validation is autonomous but safety-bounded, which means agents prove an attack path without touching the physical process, with no destructive tests. Remediation is closed-loop, with tickets, ownership, and re-validation to confirm a fix held. Findings map to MITRE ATT&CK and the Purdue model, and it deploys as SaaS, hybrid, or fully on-premises for air-gapped sites.
The honest framing: Piscium is early-stage, and the established vendors above have years of deployments and independent evaluations that a new entrant does not. What Radius offers is a specific design choice, autonomous and safety-bounded validation paired with closed-loop remediation aimed squarely at industrial environments, rather than passive visibility alone or an IT-first platform extended toward OT. Our reference material uses modeled and illustrative scenarios, not production customer results, and we align our testing to the OWASP APTS standard rather than claiming certifications we have not earned.
How to choose
Instead of asking "which one is best," ask which problem you are solving:
- Need to see what is on the OT network? Start with visibility and detection.
- Need one risk view across many asset types? Look at the cyber-physical protection and exposure suites.
- Need to prove your IT and cloud defenses hold up continuously? The validation and simulation group is built for that.
- Need the full find, prove, and fix loop inside OT safety constraints? That is the purpose-built OT CTEM corner.
And whatever the category, ask every vendor the same three questions: does discovery stay passive by default, can validation be bounded so it never reaches the process, and does the tool confirm that a fix actually closed the path?
Frequently asked questions
What is the best CTEM platform for OT/ICS? There is no single best; it depends on your first gap. Established OT vendors like Claroty and Tenable extend exposure management into OT, IT-centric CTEM vendors like XM Cyber add OT use cases, and Piscium Radius is purpose-built for OT with safety-bounded validation. Match the tool to the problem you are solving.
How is Piscium different from Claroty, Dragos, or Nozomi? Those vendors lead with visibility and detection (Dragos, Nozomi) or broad cyber-physical protection with CTEM-aligned exposure management (Claroty). Piscium Radius leads with the active-but-safe half of CTEM: autonomous, safety-bounded validation that proves which exposures are exploitable, plus closed-loop remediation. Many teams run a visibility tool and a CTEM tool together.
Is Piscium an alternative to IT CTEM tools like Pentera or XM Cyber? It overlaps with them on validation and exposure management, but its design target is different. Those platforms center on IT and cloud; Piscium Radius is built for OT and ICS constraints first, with passive discovery and validation bounded away from the physical process.
Is Piscium a mature, proven platform? Piscium is an early-stage company. Its reference material uses modeled and illustrative scenarios rather than production customer results, and it aligns its testing to the OWASP APTS standard rather than claiming certifications it has not earned. Evaluate it as an emerging option, not an established incumbent.
For the reasoning behind the OT-first design, see why IT-centric exposure management falls short in OT/ICS. For the framework basics, see What is CTEM?.
Sources
- Vendor positioning is quoted or paraphrased from each company's own website (Dragos, Nozomi Networks, Claroty, Armis, Tenable, XM Cyber, Cymulate, Picus Security, Pentera, CyCognito), as of July 2026.
- Gartner introduced the CTEM framework in 2022: Gartner, "How to Manage Cybersecurity Threats, Not Episodes".
Evaluating CTEM options for an industrial environment? Schedule a technical demo to see how Piscium Radius runs the full loop inside OT safety constraints.