Which OT security vendor is the most specialized?

Dragos, Nozomi Networks and Claroty are the most OT-focused vendors in this list, with products built around industrial networks. Choose by deployment model, managed service needs and the standards your auditors use.

Which OT security tools can run on-premise?

Claroty, Nozomi Networks and Tenable say their platforms can run on-premise, and Radiflow describes in-house SOC use. Fortinet sells network appliances. Microsoft Defender for IoT lists on-premises options. The Dragos pages do not describe a deployment model, so ask the vendor directly.

Do these products map to IEC 62443?

Nozomi Networks, Dragos, Tenable, Radiflow and Armis list IEC 62443 on their pages. Fortinet lists IEC 62443-4-1 certification for its products, and the Claroty platform page does not list the standard.

Which OT vendors offer managed monitoring?

Dragos lists Managed OT Watch and incident response, and Nozomi Networks lists professional services and a partner network for deployment. Confirm what the managed scope covers before signing a contract.

Best OT Security Platforms in 2026: Top 10 Ranked

The ranking

Top pickDragos93.0
Runner-upNozomi Networks92.0

1
Dragos
OT and xOT specialist with its own threat intelligence, Managed OT Watch and incident response. The platform page gives no deployment model, so ask about sensors and hosting before comparing it with rivals.
Best for Operators wanting managed OT detection and response
WebContact for pricing
93.0of 100
Visit Alternatives
2
Nozomi Networks
OT and IoT visibility with Guardian sensors, a Vantage console on-prem or in the cloud, and Mandiant-powered threat intelligence. Its feature set is split across many product names, which makes scoping harder.
Best for Plants needing OT and IoT asset visibility
WebSelf-hostedContact for pricing
92.0of 100
Visit Alternatives
3
Claroty
Passive monitoring, asset inventory and exposure management for industrial, healthcare and commercial sites, on-premise or in the cloud. Its platform page does not list IEC 62443 or NERC CIP, so confirm standards during evaluation.
Best for Industrial and healthcare sites needing passive discovery
WebSelf-hostedContact for pricing
91.0of 100
Visit Alternatives
4
Tenable One OT Exposure
Passive OT discovery and compliance mapping to IEC 62443, NERC CIP and NIST, with cloud, on-prem or hybrid deployment. It is part of a wider exposure platform, so it suits teams already using Tenable tools.
Best for Teams unifying OT and IT exposure management
WebSelf-hostedContact for pricing
86.0of 100
Visit Alternatives
5
TXOne Networks
OT security with endpoint, network and inspection products, and Windows endpoint coverage back to Windows 2000. Pricing is quote-based, and the product set is sold as one architecture rather than one appliance.
Best for Plants with legacy Windows endpoints and OT networks
WindowsLinuxSelf-hostedContact for pricing
84.5of 100
Visit Alternatives
6
Armis
Passive OT and IoT monitoring offered as SaaS or on-prem, with framework mapping to IEC 62443, NIST CSF and ISO 27001. Its scope also covers IT and medical assets, so OT-only buyers should check the OT module.
Best for Passive OT and IoT monitoring with SaaS or on-prem choice
WebContact for pricing
84.0of 100
Visit Alternatives
7
Fortinet OT Security Platform
Strong for segmenting OT networks with firewalls and switch-port controls, and it suits teams already on Fortinet gear. Its OT page leads with network controls, not asset inventory, and IEC 62443-4-1 covers development only.
Best for Fortinet-based networks that need OT segmentation
WebContact for pricing
83.5of 100
Visit Alternatives
8
Microsoft Defender for IoT
Azure-based OT and IoT monitoring with cloud, on-premises and hybrid options and a path into security operations centers. It is subscription-billed and suits teams that already run Microsoft cloud services.
Best for OT monitoring for teams on Microsoft Azure
WebSelf-hostedSubscription
81.5of 100
Visit Alternatives
9
Radiflow
Specialist OT threat detection and risk management for ICS and SCADA, designed for in-house SOCs and MSSPs. Its product set is narrower than the platform vendors above, and its homepage shows no prices.
Best for In-house SOCs and MSSPs covering ICS networks
WebSelf-hostedContact for pricing
80.0of 100
Visit Alternatives
10
ORDR
Device visibility across IT, IoT, OT and medical assets, with segmentation gap checks and automated response. Its scope is wider than OT alone, and the homepage lists no prices.
Best for Device visibility across mixed IT, IoT and OT estates
WebContact for pricing
77.0of 100
Visit Alternatives

At a glance

Product	Score	Price	Platforms	Delivery model	Standards and certifications	Threat intelligence
Dragos	93.0	Contact for pricing	Web	Platform plus managed service	IEC 62443, NERC CIP, NIS2	xOT threat intelligence (WorldView)
Nozomi Networks	92.0	Contact for pricing	WebSelf-hosted	Sensors with cloud or on-prem console	IEC 62443, NERC CIP, NIS2	Vantage IQ, powered by Mandiant
Claroty	91.0	Contact for pricing	WebSelf-hosted	On-premise or cloud	Not listed on platform page	Team82 research team
Tenable One OT Exposure	86.0	Contact for pricing	WebSelf-hosted	Cloud, on-premises or hybrid	IEC 62443, NERC CIP, NIST, ISO 27001	Tenable Research intelligence
TXOne Networks	84.5	Contact for pricing	WindowsLinuxSelf-hosted	Endpoint software and network hardware	Not stated on the home page	Shared threat intelligence across products
Armis	84.0	Contact for pricing	Web	SaaS or on-prem Centrix versions	IEC 62443, NIST CSF, ISO 27001, NIS2	Armis Labs research
Fortinet OT Security Platform	83.5	Contact for pricing	Web	Appliances and FortiGuard subscriptions	IEC 62443-4-1 ML2 certification	FortiGuard industrial subscriptions
Microsoft Defender for IoT	81.5	Subscription	WebSelf-hosted	Azure cloud with on-premises options	Not stated in the docs read	Not stated in the docs read
Radiflow	80.0	Contact for pricing	WebSelf-hosted	In-house SOC or MSSP-run	IEC 62443, NIS2, NIST CSF	Radiflow Labs research
ORDR	77.0	Contact for pricing	Web	Web dashboard	Not stated on the home page	Not stated on the home page

How to choose OT security platforms

Deployment: Pick on-premise sensors for plants with restricted networks. Cloud consoles suit multi-site teams. Claroty, Nozomi and Tenable offer both.
Standards: Check the IEC 62443 and NERC CIP mappings your auditors need, since not every vendor lists them on its product page.
Services: Managed monitoring and incident response help teams without an in-house SOC. Dragos lists Managed OT Watch, and Nozomi lists professional services.
Threat intelligence: Feeds differ by vendor. Nozomi cites Mandiant, Dragos runs WorldView, and Tenable cites Tenable Research.
Existing vendors: If you already run Fortinet or Tenable tools, their OT modules may fit existing tooling and staff skills.

What the scores weigh

OT asset visibility and passive monitoring
Threat detection and response services
Standards mapping and compliance reporting
Deployment options and data control
Scope for OT-only buyers

Scores are editorial, from 0 to 100, and use these criteria. Full method · Disclosure

About OT security platforms

Most OT security buyers choose between OT specialists and broader platforms. Dragos, Nozomi Networks and Claroty build their products around OT and cyber-physical systems. Tenable One OT Exposure and Fortinet OT Security sit inside wider product families, and Radiflow is a smaller specialist for ICS and SCADA networks.

Deployment is the main practical split. Claroty, Nozomi Networks and Tenable state on-premise or hybrid options, and Radiflow describes in-house SOC use and MSSP delivery. The Dragos pages describe its platform and services without a deployment model, and Fortinet sells its OT offer as network appliances and subscriptions. Microsoft Defender for IoT lists cloud, on-premises and hybrid options.

The product pages checked here publish no list prices. Nozomi Networks, Dragos, Tenable, Radiflow and Armis name IEC 62443 on their pages, and Fortinet holds IEC 62443-4-1 certification. The scores are editorial judgments, not test results, and they reflect what each product page states.

Frequently asked questions

Which OT security vendor is the most specialized?: Dragos, Nozomi Networks and Claroty are the most OT-focused vendors in this list, with products built around industrial networks. Choose by deployment model, managed service needs and the standards your auditors use.
Which OT security tools can run on-premise?: Claroty, Nozomi Networks and Tenable say their platforms can run on-premise, and Radiflow describes in-house SOC use. Fortinet sells network appliances. Microsoft Defender for IoT lists on-premises options. The Dragos pages do not describe a deployment model, so ask the vendor directly.
Do these products map to IEC 62443?: Nozomi Networks, Dragos, Tenable, Radiflow and Armis list IEC 62443 on their pages. Fortinet lists IEC 62443-4-1 certification for its products, and the Claroty platform page does not list the standard.
Which OT vendors offer managed monitoring?: Dragos lists Managed OT Watch and incident response, and Nozomi Networks lists professional services and a partner network for deployment. Confirm what the managed scope covers before signing a contract.