What are the main Secure Remote Access for OT (Privileged OT/ICS Access) vendors?

Representative vendors include Claroty Secure Remote Access (SRA), Cyolo PRO, Waterfall Security (HERA), Dispel. B4 Pro scores the full set.

Security & Compliance · Engineering, IT & AI

Should you build or buy Secure Remote Access for OT (Privileged OT/ICS Access)?

Secure Remote Access for OT software provides session brokering, just-in-time access approvals, and privileged access controls for operational technology environments — PLCs, HMIs, and ICS systems — where contractor and vendor remote access is a documented attack vector. It's used by industrial operators in manufacturing, energy, and utilities to control who can reach critical equipment and record what they do when they get there.

The build-vs-buy decision for Secure Remote Access for OT turns on whether any internal team can credibly replicate OT protocol libraries and air-gap-compatible session brokering without years of dedicated development; the specifics of your equipment estate and contractor access volume decide which vendor's protocol support actually fits.

Domain: Security & Compliance
Function: Engineering, IT & AI
Industries: Manufacturing, Energy & Utilities

Last assessed June 2026 · re-scored quarterly via The Continuum.

Build it, buy it, or bridge?

	Build it	Buy it	Bridge (buy, then extend)
Cost shape	Not viable — no realistic self-build path at production scale	Custom enterprise pricing; stable; justified by risk reduction	Buy platform, configure site-specific JIT workflows and vendor access policies
Time to value	Years of OT protocol development before any production deployment	Weeks to configure site-specific vendor access and safety interlocks	Platform live quickly; deep site customization takes 3-6 months
Differentiation captured	Full control over access policy and session recording architecture	OT protocol expertise and safety constraints handled by vendor	Own the access policy; vendor owns the protocol and air-gap infrastructure
AI feasibility today	OT protocol support and air-gap design not buildable by any typical team	Vendors bring years of PLC/HMI protocol library development	AI can assist configuration scripting, not the protocol layer itself
Who it fits	Effectively nobody — no production independent examples exist	All industrial operators with third-party contractor access to OT systems	Operators with complex multi-site estates who need vendor-specific customization

The B4 call

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When building Secure Remote Access for OT (Privileged OT/ICS Access) makes sense

There is no credible self-build path for OT privileged access management at production scale. Agentless session brokering with PLC and HMI protocol support, designed for air-gapped environments with hard safety constraints, requires years of OT-specific development that vendors have already invested. Colonial Pipeline is the frequently cited real-world example of what happens when contractor remote access to industrial systems is inadequately controlled. No independent engineering team has shipped a production alternative covering PLC/HMI protocol passthrough, moving-target-defense architectures, and air-gap-compatible design in combination. The only scenario where internal development touches this space is within large industrial organizations with existing OT expertise building narrowly scoped JIT approval workflows on top of existing vendor platforms — which is the bridge pattern, not a build from scratch.

When buying Secure Remote Access for OT (Privileged OT/ICS Access) makes sense

Buying is the right call for any industrial operator where third-party contractors access PLCs, HMIs, or ICS equipment remotely. The session brokering, JIT approval workflows, and session recording that platforms like Claroty Secure Remote Access and Cyolo PRO provide aren't replicable internally at the OT protocol level. Beyond the technical argument, the compliance and insurance angle is meaningful — industrial cyber insurance increasingly requires documented privileged access controls for OT environments. The real buying decision is vendor selection: which platform's connector library covers the specific PLC and HMI equipment in your estate, and which JIT approval workflow model fits your contractor management processes. Dispel's focus on smaller industrial operations and Waterfall Security's hardware-enforced unidirectional architecture serve different parts of the market than Claroty's enterprise coverage.

Third-party and contractor access to PLCs and HMIs is a documented attack vector in critical infrastructure. The session brokering and JIT approval workflows in platforms like Claroty Secure Remote Access, Cyolo PRO, and Xage Security encode each site's specific vendor access patterns, safety interlocks, and protocol requirements. That configuration is deeply site-specific and shapes how remote access works in practice.

Buying earns its keep for any industrial operator where a contractor breach via remote access is a realistic threat model. It's also worth noting that Colonial Pipeline is the documented cautionary tale here. The build case is not viable. Agentless OT-aware session brokering with PLC and HMI protocol support, designed for air-gapped environments with safety constraints, is not something engineering teams build internally. The conversation is which vendor's OT protocol library covers the specific equipment estate, not whether to buy.

Representative vendors

Claroty Secure Remote Access (SRA)Cyolo PRO and 3 more, scored in B4 Pro

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Frequently asked

What is Secure Remote Access for OT (Privileged OT/ICS Access)?: Secure Remote Access for OT provides session brokering, just-in-time access approvals, and privileged access controls for operational technology environments — PLCs, HMIs, and ICS systems — where contractor and vendor remote access is a documented attack vector. It gives industrial operators control over who reaches critical equipment and a full audit record of every session.
When does building Secure Remote Access for OT (Privileged OT/ICS Access) make sense?: Building from scratch is not viable. The OT protocol expertise, air-gap design requirements, and safety constraint architecture these platforms embody aren't replicable by an internal team without years of dedicated development. The closest to a build case is configuring site-specific JIT workflows on top of an existing vendor platform.
When does buying Secure Remote Access for OT (Privileged OT/ICS Access) make sense?: Buying makes sense for any industrial operator with third-party contractor access to PLCs or HMIs — which is nearly all of them. The protocol library and air-gap architecture vendors bring can't be replicated internally, and the risk of a contractor breach via poorly controlled remote access is both real and well-documented.
What are the main Secure Remote Access for OT (Privileged OT/ICS Access) vendors?: Representative vendors include Claroty Secure Remote Access (SRA), Cyolo PRO, Waterfall Security (HERA), Dispel. B4 Pro scores the full set.

The B4 Index scores every software category on two axes, strategic differentiation and AI feasibility, to classify it Build, Buy, Bridge, or Beware. See the full methodology.

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