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Cybersecurity · head to head

Delinea vs Tenable Nessus

Delinea logo

Delinea

Cybersecurity

Privileged access management from the merged Thycotic and Centrify

From
On request
Rated
-
Full reviewWebsite
Tenable Nessus logo

Tenable Nessus

Cybersecurity

Network vulnerability scanner

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only Tenable Nessus has a free tier, so it costs nothing to try first.
  • Each has a real cost: Delinea the Thycotic and Centrify lineages are integrated unevenly, so buying the full portfolio means running consoles and agents that do not share one administrative model as cleanly as the marketing suggests.; Tenable Nessus nessus Professional is $4,790 for one year, sold as an annual licence rather than a per scan or usage based fee
  • They diverge on capability: Delinea covers Secret Server, Tenable Nessus covers Network scanning.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Delinea and Tenable Nessus actually diverge.

Attributes where Delinea and Tenable Nessus differ
AttributeDelineaTenable Nessus
Starting priceOn requestFree
Pricing modelquotesubscription
Free tierNoYes
PlatformsWeb, Windows, Linux, macOSWindows, Linux, Macos, Cloud
FoundedUnknown2002

Identical on both: user rating (Not yet rated), category (Cybersecurity).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Delinea

  • Secret Server
  • Privileged session recording
  • Privilege Manager
  • Server PAM
  • Discovery
  • DevOps secrets
  • Behaviour analytics

Only in Tenable Nessus

  • Network scanning
  • Vulnerability detection
  • Configuration assessment
  • Malware detection
  • Compliance checking
  • Cloud security assessment
  • Mobile scanning
  • API access

What people use each for

The jobs each tool is most often brought in to do.

Delinea

  • An organisation whose cyber insurer now requires privileged credentials to be vaulted and rotatednot Tenable Nessus
  • A mid-market IT team that abandoned a heavier PAM rollout and needs a vault that can be in production in weeksnot Tenable Nessus
  • A company removing local administrator rights from every workstation after a ransomware incidentnot Tenable Nessus
  • An audit finding that shared service account passwords are stored in a spreadsheet and used by contractorsnot Tenable Nessus

Tenable Nessus

  • Vulnerability scanning of servers, network devices and web applicationsnot Delinea
  • Configuration and compliance auditing against hardening benchmarksnot Delinea
  • Point in time assessments by consultants and penetration testersnot Delinea

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Delinea

  • The Thycotic and Centrify lineages are integrated unevenly, so buying the full portfolio means running consoles and agents that do not share one administrative model as cleanly as the marketing suggests.
  • Modules are licensed separately by different units, per privileged user for the vault and per endpoint for privilege management, which makes total cost hard to model and easy to underestimate at scale.
  • Delinea does not publish rates, so buyers benchmark against third party and public sector listings; expect list prices to be negotiable by a wide margin, which means the first quote is not the price.
  • Thoma Bravo ownership since 2021 has coincided with firmer renewal pricing, and buyers with a single-vendor PAM estate have little leverage once credentials are inside the vault.
  • Migrating out of a privileged access vault is a genuinely hard project because every automated process that fetches a secret has to be repointed, so the switching cost is real and the vendor knows it.

Tenable Nessus

  • Nessus Professional is $4,790 for one year, sold as an annual licence rather than a per scan or usage based fee
  • Support beyond the base entitlement costs an extra $400 per year for Advanced Support with 24x365 phone and chat access
  • The on demand training course is a separate $275 purchase for a single person for one year
  • Multi year discounts require paying for two or three years up front

Pricing, plan by plan

Delinea

On request
  • Secret Server$undefined/year
    • Priced per privileged user, tiered by edition
    • Cloud or on premises deployment
    • Session recording in higher editions
  • Privilege Manager$undefined/year
    • Priced per endpoint
    • Local admin rights removal and application elevation
    • Licensed separately from Secret Server
  • Server PAM$undefined/year
    • Priced per managed server or per privileged user
    • Just-in-time server access
    • Licensed separately

Tenable Nessus

Free
  • Nessus EssentialsFree
    • Up to 16 ips
    • Network scanning
    • Vulnerability assessment
  • Nessus Professional$2600/year
    • Unlimited targets
    • Enterprise features
    • Advanced analytics
  • Nessus Expert$5200/year
    • All Professional features
    • Cloud integration
    • Advanced reporting

Which should you pick?

Choose Delinea if

  • You need secret server.
  • You work on Web, Windows, Linux, macOS.
  • You also want privileged session recording.
Delinea review

Choose Tenable Nessus if

  • You need network scanning.
  • You want to start without paying.
  • You work on Windows, Linux, Macos, Cloud.
  • You also want vulnerability detection.
Tenable Nessus review

Questions people ask

Is Delinea or Tenable Nessus better?
Neither clearly leads. Delinea starts at On request and Tenable Nessus at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Delinea or Tenable Nessus?
Tenable Nessus has a free tier; the other does not. Paid plans start at On request for Delinea and Free for Tenable Nessus.
Does Delinea or Tenable Nessus run on more platforms?
Delinea runs on Web, Windows, Linux, macOS. Tenable Nessus runs on Windows, Linux, Macos, Cloud.
Can I use Tenable Nessus for free?
Yes. Tenable Nessus has a free tier, so you can try it without paying. Delinea starts at On request.
What is Delinea best used for?
Delinea is most often used for an organisation whose cyber insurer now requires privileged credentials to be vaulted and rotated, a mid-market it team that abandoned a heavier pam rollout and needs a vault that can be in production in weeks, a company removing local administrator rights from every workstation after a ransomware incident, an audit finding that shared service account passwords are stored in a spreadsheet and used by contractors. Of those, an organisation whose cyber insurer now requires privileged credentials to be vaulted and rotated and a mid-market it team that abandoned a heavier pam rollout and needs a vault that can be in production in weeks are not what Tenable Nessus is typically brought in for.
What can Delinea do that Tenable Nessus cannot?
Delinea covers Secret Server, Privileged session recording, Privilege Manager, Server PAM. Tenable Nessus covers Network scanning, Vulnerability detection, Configuration assessment, Malware detection.

Answered from the vendors’ own pages

Delinea: Is Delinea the same as Thycotic?

Delinea is the merged company formed from Thycotic and Centrify in 2021. Secret Server is the former Thycotic product; the server access products come from Centrify.

Tenable Nessus: What are the three Nessus offerings?

Nessus Essentials is a free introductory offering for educators, students, and career starters, limited to 16 IPs for scanning. Nessus Professional is designed for consultants and SMBs, providing unlimited IT scans across any location. Nessus Expert is the premium offering extending Professional with web application scanning, infrastructure-as-code scanning, and external attack surface assessment up to 5 domains.

Source
Delinea: Is pricing published?

Not by Delinea. Public sector frameworks have listed Secret Server Cloud around 348 GBP per user per year, which is a reference point, not a quote.

Tenable Nessus: What OS platforms does Nessus support?

Nessus runs on Debian/Kali Linux, Fedora, FreeBSD, Mac OS X, Red Hat/CentOS, SUSE Linux, Ubuntu, and various Windows versions including Server 2008, 2012, and Windows 7-10.

Source
Delinea: Does one licence cover endpoints and servers?

No. Secret Server, Privilege Manager and Server PAM are separately licensed on different units. Scope all three if your requirement spans them.

Tenable Nessus: Can I use Nessus to scan third-party networks as a consultant?

Yes, Tenable permits you to use Nessus to scan third-party networks. Nessus Professional is ideal for consultants.

Source
Tenable Nessus: Can Nessus perform PCI external scanning?

Yes, you can use Nessus Professional to perform external network scans as required by the PCI DSS 11.2.2 requirement.

Source
Tenable Nessus: What additional features does Nessus Expert provide?

Web application scanning, which is dynamic application security testing (DAST) providing comprehensive visibility and insight into web application security issues; scanning code repositories for vulnerabilities; and assessing external attack surface with subdomain discovery.

Source
Tenable Nessus: What support options exist for Nessus Professional?

Standard Support includes software upgrades, patches, plugin access, and 24x7 support via chat and community portal. Advanced Support adds 24x7 phone access and committed SLAs: P1 less than 2 hours, P2 less than 4 hours, P3 less than 12 hours, P4 less than 24 hours.

Source
Tenable Nessus: How frequently are Nessus plugins updated?

Nessus plugins are updated daily, based on when vendors and security research sites publish new vulnerabilities.

Source
Tenable Nessus: How does licensing work in virtual machine environments?

Whether you are using Nessus in a physical or a virtual environment, the IP addresses or hosts that you are scanning from must be licensed.

Source
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