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Developer Tools · head to head

Ansible vs Tenable Nessus

Ansible logo

Ansible

Developer Tools

Simple, agentless IT automation

From
Free
Free plan
Yes
Full reviewWebsite
Tenable Nessus logo

Tenable Nessus

Cybersecurity

Network vulnerability scanner

From
Free
Free plan
Yes
Full reviewWebsite

The short version

  • Each has a real cost: Ansible the open source project gives the engine and the language; the automation controller, automation mesh, automation hub, analytics and governance all belong to the paid Red Hat Ansible Automation Platform; 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: Ansible covers Playbooks, Tenable Nessus covers Network scanning.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

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

Attributes where Ansible and Tenable Nessus differ
AttributeAnsibleTenable Nessus
Pricing modelopen-sourcesubscription
PlatformsLinux, Windows, Mac, ApiWindows, Linux, Macos, Cloud
CategoryDeveloper ToolsCybersecurity
Founded20122002

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated).

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 Ansible

  • Playbooks
  • Inventory management
  • Module library
  • Variables and templating
  • Handlers
  • Roles
  • Async tasks
  • Plugins

Only in Tenable Nessus

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

Both cover

  • AWS
  • Azure
  • Cloud deployment
  • Windows support

What people use each for

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

Ansible

  • Configuration managementnot Tenable Nessus
  • Server provisioningnot Tenable Nessus
  • Application deploymentnot Tenable Nessus
  • Multi-node managementnot Tenable Nessus
  • Orchestrationnot Tenable Nessus

Tenable Nessus

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

Where each one falls short

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

Ansible

  • The open source project gives the engine and the language; the automation controller, automation mesh, automation hub, analytics and governance all belong to the paid Red Hat Ansible Automation Platform
  • Event-Driven Ansible and the AI coding assistant are platform features rather than open source ones
  • Red Hat does not publish platform pricing
  • Running open source Ansible at scale means building the control plane the platform otherwise provides

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

Ansible

Free
  • Open SourceFree
    • Community edition
    • Unlimited nodes
    • Full functionality
  • Ansible Automation Platform$5000/year
    • Enterprise support
    • Ansible Tower
    • Advanced features

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 Ansible if

  • You need playbooks.
  • You want to start without paying.
  • You work on Linux, Windows, Mac, Api.
  • You also want inventory management.
Ansible 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 Ansible or Tenable Nessus better?
Neither clearly leads. Ansible starts at Free and Tenable Nessus at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Ansible or Tenable Nessus?
Ansible starts at Free and Tenable Nessus at Free.
Does Ansible or Tenable Nessus run on more platforms?
Ansible runs on Linux, Windows, Mac, Api. Tenable Nessus runs on Windows, Linux, Macos, Cloud.
Can I use Ansible for free?
Both have a free tier, so you can try either at no cost before committing.
What is Ansible best used for?
Ansible is most often used for configuration management, server provisioning, application deployment, multi-node management. Of those, configuration management and server provisioning are not what Tenable Nessus is typically brought in for.
What can Ansible do that Tenable Nessus cannot?
Ansible covers Playbooks, Inventory management, Module library, Variables and templating. Tenable Nessus covers Network scanning, Vulnerability detection, Configuration assessment, Malware detection. Both handle AWS, Azure, Cloud deployment, Windows support.

Answered from the vendors’ own pages

Ansible: Is Ansible free for commercial use?

Ansible Collaborative is open source. The page describes it as 'an open source IT automation engine' and does not impose restrictions on commercial use for the open source version.

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
Ansible: What is the difference between open source Ansible and the commercial alternative?

The page references Red Hat Ansible Automation Platform as an enterprise alternative to Ansible Collaborative, but does not disclose specific differences, pricing, or feature comparisons between the two offerings.

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
Ansible: Is there paid support available for Ansible?

The page does not disclose whether paid support contracts are available for open source Ansible or whether Red Hat offers support plans for their enterprise Ansible Automation Platform.

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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