SIDE BY SIDE · FACTS ONLY

Armis vs Tenable: asset inventory facts side by side

SHORT ANSWER

Armis describes 4 of the five approaches on the pages we read and Tenable describes 3; they differ on Agent-based inventory, External attack surface management and CMDB-centred inventory. On collection, Armis works without new agents and Tenable does not describe its collection method on the pages we read. Many estates run two of these approaches together, so the question is often which pair, not which one; we do not score either.

By The Inventory Desk · CAASM Finder · Published 2026-10-11

Desk research from public vendor pages read on 27 September and 11 October 2026. Profiles follow our published method; we did not run the products.

How do their approaches compare?

Top bar: Armis Centrix
Lower bar, lighter: Tenable One

Full bar: described on the vendor's pages we read
Hatched bar: described with a condition (another product, a higher tier, or part of the approach)
Stub: not in our sources (it may exist; we did not find it)

The bars show what each vendor's own pages describe, or how your answers weigh the five approaches. They are not a measure of how well a product works.

What are the facts, side by side?

From each vendor's own pages. Differs marks rows where the recorded status or check value differs.
Fact	Armis Centrix	Tenable One
Positioning	Armis calls Centrix a Cyber Exposure Management Platform. It builds an inventory of IT, OT, IoT and medical devices from agentless, passive discovery and adds modules for prioritization and remediation.	Tenable's exposure management platform. Tenable Attack Surface Management, part of Tenable One, maps external assets from a map of more than 5 billion assets; Tenable One adds attack path analysis, Hexa AI remediation and connectors for third-party data.
Deployment	A cloud platform with no on-premises hardware to install or manage for the asset management module. Source: Armis Centrix for Asset Management and Security · Read 11 Oct 2026	Tenable Attack Surface Management is sold through a demo request, not online. Source: Tenable: buy · Read 27 Sep 2026
CAASM aggregation	With a condition Builds most of its inventory from its own agentless discovery and enriches it through more than 200 pre-built integrations. Source: Armis Centrix platform · Read 27 Sep 2026	With a condition Tenable One Connectors bring third-party data into the platform; a unified asset inventory is not described in detail on the pages we read. Source: Tenable One · Read 27 Sep 2026
Agent-based inventoryDiffers	With a condition Collects its own data without agents: agentless, passive discovery of managed and unmanaged devices. Source: Armis Centrix platform · Read 27 Sep 2026	Not in our sources Not described on the pages we read.
External attack surface managementDiffers	Not in our sources Not described on the pages we read.	Described Identifies domains related to your inventory from a map of 5 billion+ assets with 200+ metadata fields. Source: Tenable Attack Surface Management · Read 27 Sep 2026
CMDB-centred inventoryDiffers	With a condition Pushes enriched asset data back to your CMDB rather than replacing it. Source: Armis Centrix for Asset Management and Security · Read 11 Oct 2026	Not in our sources Not described on the pages we read.
Exposure management	Described Sold as a Cyber Exposure Management Platform, with VIPR-Pro Prioritization and Remediation, Vulnerability Management Detection and Response, and Early Warning modules. Source: Armis Centrix platform · Read 27 Sep 2026	Described Tenable One is Tenable's exposure management platform, with attack path analysis across 150+ techniques and Hexa AI automated remediation. Source: Tenable One · Read 27 Sep 2026
Servers and network devicesDiffers	Matches IT devices, managed or unmanaged, through agentless passive discovery. Source: Armis Centrix for Asset Management and Security · Read 11 Oct 2026	Partly Tenable One includes vulnerability management alongside external attack surface data. Source: Tenable: buy · Read 27 Sep 2026
Cloud workloadsDiffers	Matches Cloud instances and hybrid VMs are covered. Source: Armis Centrix for Asset Management and Security · Read 11 Oct 2026	Not in our sources
SaaS applications	Not in our sources	Not in our sources
Identities as assets	Not in our sources	Not in our sources
Off-network laptops	Not in our sources	Not in our sources
OT and IoT devicesDiffers	Matches OT and IoT devices, and medical devices through a separate module. Source: Armis Centrix platform · Read 27 Sep 2026	Not in our sources
Internet-facing discoveryDiffers	Not in our sources	Matches A 5 billion+ asset map with 200+ metadata fields. Source: Tenable Attack Surface Management · Read 27 Sep 2026
Offers its own agentDiffers	Not in our sources	Not in our sources
Works without new agentsDiffers	Matches Agentless and passive. Source: Armis Centrix platform · Read 27 Sep 2026	Not in our sources
Merges records from several sources	Partly Identifies assets against a knowledgebase of over 6.5 billion assets; how records from integrations merge is not described in detail. Source: Armis Centrix platform · Read 27 Sep 2026	Partly Tenable One Connectors bring third-party data into the platform. Source: Tenable One · Read 27 Sep 2026
Feeds or updates a CMDBDiffers	Matches Pushes enriched data back to your CMDB. Source: Armis Centrix for Asset Management and Security · Read 11 Oct 2026	Not in our sources
Cross-source queries and reports	Not in our sources	Not in our sources
Workflows, tickets or actions	Partly Prioritization and remediation sit in the separate VIPR-Pro module. Source: Armis Centrix platform · Read 27 Sep 2026	Partly Hexa AI orchestrates automated remediation in Tenable One. Source: Tenable One · Read 27 Sep 2026
Price or pricing basis published	Partly AWS Marketplace listing: Centrix Standard minimum at $3,250 a month on a one-month contract; no price on armis.com. Source: AWS Marketplace: Armis Device Security Platform · Read 11 Oct 2026	Partly Attack Surface Management is not sold online; Tenable publishes adjacent prices, such as Tenable One Vulnerability Management at $3,700 for one year for up to 250 assets. Source: Tenable: buy · Read 27 Sep 2026
Free tier or trialDiffers	Not in our sources	Partly Free trials for Tenable One Vulnerability Management and Nessus; the Tenable One platform and its exposure products are demo only. Source: Tenable free trials · Read 11 Oct 2026
Platform it is part of	None	Tenable: External findings sit in Tenable One next to Tenable vulnerability data. Source: Tenable One · Read 27 Sep 2026
Integrations	More than 200 pre-built integrations. Source: Armis Centrix platform · Read 27 Sep 2026	Tenable One Connectors bring third-party data into the platform. Source: Tenable One · Read 27 Sep 2026
Price	No price on armis.com. AWS Marketplace listing: Centrix Standard minimum at $3,250 a month on a one-month contract, with private offers. Source: AWS Marketplace: Armis Device Security Platform · Read 11 Oct 2026	Attack Surface Management: demo request only. Adjacent published price: Tenable One Vulnerability Management at $3,700 for one year for up to 250 assets. Source: Tenable: buy · Read 27 Sep 2026

Where do they differ?

Agent-based inventory: Armis describes it with a condition; Tenable is not in our sources.
External attack surface management: Armis is not in our sources; Tenable describes it.
CMDB-centred inventory: Armis describes it with a condition; Tenable is not in our sources.
Servers and network devices: Armis matches; Tenable partly matches.
Cloud workloads: Armis matches; Tenable is not in our sources.
OT and IoT devices: Armis matches; Tenable is not in our sources.
Internet-facing discovery: Armis is not in our sources; Tenable matches.
Works without new agents: Armis matches; Tenable is not in our sources.
Feeds or updates a CMDB: Armis matches; Tenable is not in our sources.
Free tier or trial: Armis is not in our sources; Tenable partly matches.

Can they work together?

Neither vendor's pages we read name the other as an integration. That does not mean they cannot work together; ask both vendors.

Choose Armis if

Your estate includes OT, IoT or medical devices that cannot take an agent
You want device discovery and exposure modules from one vendor that is now part of ServiceNow

Choose Tenable if

You already run Tenable vulnerability management
Your question is which exposures to fix first more than which assets exist

Which limits should you check?

Armis

No price on armis.com; the only public figure is an AWS Marketplace minimum.
SaaS applications and identities are not described as asset classes on the pages we read.
Prioritization and remediation sit in separately named modules.

Tenable

Attack Surface Management and the Tenable One platform are demo only; free trials cover Vulnerability Management and Nessus.
A unified internal asset inventory, SaaS apps and identities are not described on the pages we read.

Put Armis and Tenable in the asset census with others Run the finder

Questions people ask

Is Armis or Tenable better?

Neither is scored on this site. Armis describes 4 of five approaches and Tenable 3 on the pages we read, and they differ on 10 recorded facts. Which fits depends on where your assets live, whether you can install agents, your CMDB and your tools; the finder checks those.

Do Armis and Tenable work with a CMDB?

Armis: Matches. Pushes enriched data back to your CMDB. Tenable: Not in our sources.

Do Armis or Tenable publish prices?

Armis: No price on armis.com. AWS Marketplace listing: Centrix Standard minimum at $3,250 a month on a one-month contract, with private offers. Tenable: Attack Surface Management: demo request only. Adjacent published price: Tenable One Vulnerability Management at $3,700 for one year for up to 250 assets.