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Cybersecurity · head to head

Tenable Nessus vs ThetaRay

Tenable Nessus logo

Tenable Nessus

Cybersecurity

Network vulnerability scanner

From
Free
Rated
-
Full reviewWebsite
ThetaRay logo

ThetaRay

Cybersecurity

Unsupervised AI transaction monitoring for cross-border and correspondent banking

From
On request
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: Tenable Nessus nessus Professional is $4,790 for one year, sold as an annual licence rather than a per scan or usage based fee; ThetaRay unsupervised models are harder to justify to an examiner than explicit rules, and some regulators still expect documented threshold logic, which can force you to run both systems.
  • They diverge on capability: Tenable Nessus covers Network scanning, ThetaRay covers Unsupervised detection.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

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

Attributes where Tenable Nessus and ThetaRay differ
AttributeTenable NessusThetaRay
Starting priceFreeOn request
Pricing modelsubscriptionquote
Free tierYesNo
PlatformsWindows, Linux, Macos, CloudWeb
Founded2002Unknown

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 Tenable Nessus

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

Only in ThetaRay

  • Unsupervised detection
  • Cross-border focus
  • Sanctions screening
  • Alert triage
  • Customer risk scoring
  • Cloud native

What people use each for

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

Tenable Nessus

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

ThetaRay

  • A correspondent bank that cannot see the ultimate originator and needs behavioural signals rather than counterparty listsnot Tenable Nessus
  • A cross-border payments fintech whose rules engine produces more alerts than its compliance team can clearnot Tenable Nessus
  • A bank under a regulatory consent order needing demonstrable improvement in detection within a fixed periodnot Tenable Nessus
  • A payment institution entering a high-risk corridor where existing thresholds were calibrated on domestic trafficnot Tenable Nessus

Where each one falls short

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

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

ThetaRay

  • Unsupervised models are harder to justify to an examiner than explicit rules, and some regulators still expect documented threshold logic, which can force you to run both systems.
  • The alert reduction claim depends heavily on your data, so a parallel run is essential and adds months and cost before you can decommission the incumbent.
  • Coverage is strongest in cross-border and correspondent flows; institutions whose risk is domestic retail fraud will find the fit weaker than a general-purpose monitoring platform.
  • It is a smaller vendor than the incumbents, so integration connectors into legacy core banking systems are often bespoke work rather than a supported adapter.
  • Model retraining and tuning are vendor-led, which means changing detection behaviour is a support conversation rather than something your own analysts can do that afternoon.

Pricing, plan by plan

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

ThetaRay

On request
  • ThetaRay Sonar$undefined/year
    • Priced by monitored transaction volume and number of monitored entities
    • SaaS on Azure with regional data residency options
    • Parallel run and model tuning included in onboarding

Which should you pick?

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

Choose ThetaRay if

  • You need unsupervised detection.
  • You also want cross-border focus.
ThetaRay review

Questions people ask

Is Tenable Nessus or ThetaRay better?
Neither clearly leads. Tenable Nessus starts at Free and ThetaRay at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Tenable Nessus or ThetaRay?
Tenable Nessus has a free tier; the other does not. Paid plans start at Free for Tenable Nessus and On request for ThetaRay.
Does Tenable Nessus or ThetaRay run on more platforms?
Tenable Nessus runs on Windows, Linux, Macos, Cloud. ThetaRay runs on Web.
Can I use Tenable Nessus for free?
Yes. Tenable Nessus has a free tier, so you can try it without paying. ThetaRay starts at On request.
What is Tenable Nessus best used for?
Tenable Nessus is most often used for vulnerability scanning of servers, network devices and web applications, configuration and compliance auditing against hardening benchmarks, point in time assessments by consultants and penetration testers. Of those, vulnerability scanning of servers, network devices and web applications and configuration and compliance auditing against hardening benchmarks are not what ThetaRay is typically brought in for.
What can Tenable Nessus do that ThetaRay cannot?
Tenable Nessus covers Network scanning, Vulnerability detection, Configuration assessment, Malware detection. ThetaRay covers Unsupervised detection, Cross-border focus, Sanctions screening, Alert triage.

Answered from the vendors’ own pages

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
ThetaRay: Does it replace a rules engine entirely?

Rarely on day one. Most institutions run it alongside existing rules during a parallel period, and some keep specific regulator-mandated rules permanently.

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
ThetaRay: Where is the data processed?

SaaS runs on Microsoft Azure with regional deployment options, which is the mechanism for meeting data residency conditions in regulated markets.

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
ThetaRay: Is sanctions screening included?

Screening is available on the same platform but licensed as part of the commercial package rather than bundled by default. Confirm it is in your quote.

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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