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Cybersecurity · head to head

Darktrace vs Tenable Nessus

Darktrace logo

Darktrace

Cybersecurity

Autonomous threat detection and response

From
$20000/year
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: Darktrace no pricing information published on website; vendors must request pricing through demo request form or contact sales; 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: Darktrace covers Self-learning AI, Tenable Nessus covers Network scanning.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

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

Attributes where Darktrace and Tenable Nessus differ
AttributeDarktraceTenable Nessus
Starting price$20000/yearFree
Free tierNoYes
PlatformsNetwork, Cloud, EmailWindows, Linux, Macos, Cloud
Founded20132002

Identical on both: pricing model (subscription), 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 Darktrace

  • Self-learning AI
  • Network anomaly detection
  • Autonomous response
  • Behavioral analysis
  • Threat model visualization
  • Email security
  • Application control
  • Incident response automation

Only in Tenable Nessus

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

Both cover

  • Splunk
  • SOC2 Type 2
  • ISO 27001
  • GDPR
  • Cloud deployment

What people use each for

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

Darktrace

  • Threat Detectionnot Tenable Nessus
  • Ndrnot Tenable Nessus
  • Incident Responsenot Tenable Nessus

Tenable Nessus

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

Where each one falls short

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

Darktrace

  • No pricing information published on website; vendors must request pricing through demo request form or contact sales
  • No tiered pricing structure available to compare editions or select appropriate plan level before contacting sales

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

Darktrace

$20000/year
  • Detect$20000/year
    • Network anomaly detection
    • AI-powered threat detection
    • Compliance reporting
  • Detect & Respond$35000/year
    • All Detect features
    • Autonomous response
    • Email security
  • Enterprise$50000/year
    • All features
    • Dedicated support
    • Custom training

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 Darktrace if

  • You need self-learning ai.
  • You work on Network, Cloud, Email.
  • You also want network anomaly detection.
Darktrace 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 Darktrace or Tenable Nessus better?
Neither clearly leads. Darktrace starts at $20000/year and Tenable Nessus at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Darktrace or Tenable Nessus?
Tenable Nessus has a free tier; the other does not. Paid plans start at $20000/year for Darktrace and Free for Tenable Nessus.
Does Darktrace or Tenable Nessus run on more platforms?
Darktrace runs on Network, Cloud, Email. 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. Darktrace starts at $20000/year.
What is Darktrace best used for?
Darktrace is most often used for threat detection, ndr, incident response. Of those, threat detection and ndr are not what Tenable Nessus is typically brought in for.
What can Darktrace do that Tenable Nessus cannot?
Darktrace covers Self-learning AI, Network anomaly detection, Autonomous response, Behavioral analysis. Tenable Nessus covers Network scanning, Vulnerability detection, Configuration assessment, Malware detection. Both handle Splunk, SOC2 Type 2, ISO 27001, GDPR.

Answered from the vendors’ own pages

Darktrace: How much does Darktrace cost?

Darktrace does not publish pricing information on its website. To obtain pricing details and learn about available packages, customers must contact Darktrace directly by requesting a demo or reaching out through the company's contact form.

Source
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
Darktrace: Does Darktrace offer a free trial?

Darktrace mentions a free trial option, but specific trial length, features included, and how to access it are not published on the website. Users must contact the company directly to inquire about trial availability.

Source
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
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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