What Tenable Nessus Actually Costs in 2026: Pricing, Tiers, and Hidden Fees

How much does Tenable Nessus cost in 2026?

Nessus Professional costs $4,790 per year and Nessus Expert costs $6,790 per year. Both are per-scanner licenses with unlimited IP scanning and no per-asset fees or seat minimums. A free tier exists, but it is now a 30-day evaluation license limited to 5 IPs — not the persistent 16-IP tool that many older guides describe.

Multi-year licenses (2–3 years) are available and lower the effective annual cost, with exact savings shown in the Tenable store at checkout. Larger buyers may also purchase through Tenable partners or authorized resellers.

Prices verified April 2026 against the Tenable purchase interface. Tenable does not publish prices in static HTML — the listed rates are from the live Tenable store and may change. Pricing shown may vary by region; Tenable notes VAT-inclusive pricing in some markets. Check tenable.com/buy for current pricing before purchasing.

Nessus pricing tiers: what's included at each level

Nessus has four tiers: Essentials (free, 30-day, 5 IPs), Essentials Plus (paid annual, 20 IPs), Professional ($4,790/yr, unlimited IPs), and Expert ($6,790/yr, unlimited IPs plus web app scanning, external attack surface discovery, and IaC scanning).

Nessus Essentials is a 30-day free evaluation license. It covers 5 IPs per scanner, uses the same core scanning engine as paid tiers, and includes basic scan templates. It does not include real-time plugin updates, compliance auditing, reporting, or data retention after the license expires. After the 30-day period ends, scan history is not retained unless you move to a paid tier.

Nessus Essentials Plus is a new paid annual tier positioned between the free trial and Professional. It covers up to 20 IPs, includes real-time plugin updates, basic PDF/HTML reporting, and year-long data retention. Tenable offers it at no cost to verified students and educators through their Nessus for Education program. For anyone else, the annual cost is shown at the Tenable store — it is not published as a flat rate on their marketing pages.

Nessus Professional ($4,790/year) is the standard commercial tier. It includes:

• Unlimited IP scanning (no per-asset fees)
• Full compliance and configuration auditing against CIS, DISA STIG, PCI-DSS, and HIPAA templates
• Configurable and exportable reports
• Live Results (offline vulnerability assessment on every plugin update)
• Standard Support and self-service resources
• Optional add-ons: Advanced Support and on-demand training (sold separately)

Nessus Expert ($6,790/year) includes everything in Professional plus three capabilities that extend coverage beyond internal network scanning:

• Web app scanning: Scans up to 5 FQDNs for web application vulnerabilities — coverage that network scanning alone does not reach.
• External attack surface discovery scanning: Discovers and assesses up to 5 external domains per quarter to surface internet-facing exposures you may not be actively monitoring.
• Infrastructure-as-Code scanning: Checks Terraform and Kubernetes configuration files for misconfigurations in DevSecOps pipelines.

The $2,000/year premium over Professional covers those three capabilities. If you do not need web app scanning, external attack surface discovery, or IaC checks, Professional will usually be the better fit.

What Nessus costs beyond the list price

Three costs to factor beyond the list price: the Advanced Support upgrade ($400/year for 24x365 phone, email, and chat access), optional on-demand training ($275), and multi-year pricing that can lower the effective annual rate.

Advanced Support ($400/year add-on): The base Professional and Expert licenses include Standard Support — a community portal, knowledge base, and self-service resources. Advanced Support adds 24x365 phone, email, chat, and community access for $400/year. For teams that rely on vendor support for troubleshooting credential failures or scan policy issues, it is worth including in the purchase.

Multi-year savings: Tenable offers 2-year and 3-year license options at a reduced effective annual rate. The exact savings are applied at checkout in the Tenable store; the marketing page only advertises the one-year rate. If you are planning to run Nessus for more than a year, confirm the multi-year rate at checkout before purchasing.

Nessus Fundamentals training ($275, optional): An on-demand video course covering asset discovery through compliance reporting. Worth the cost for teams new to vulnerability operations; experienced users will not need it.

Total cost of ownership by scenario:

Is the free Nessus tier enough for a small business?

For most small businesses, no. The current free Essentials license is a 30-day evaluation covering 5 IPs. A typical small office environment — even a 10-person team — will have servers, workstations, a firewall, switches, and NAS devices that collectively exceed 5 scannable IPs. Once the 30-day period expires, scan history is lost unless you upgrade.

Where Essentials still makes sense:

• Pre-purchase evaluation before committing to Professional
• A home lab or isolated test environment with genuinely few assets
• A student or educator who qualifies for the free Essentials Plus license through the Nessus for Education program

The practical threshold: If you have more than 5 active networked assets and want scan data you can act on over time, Nessus Professional is the minimum viable tier. At $4,790/year, that is a meaningful commitment for a small team — evaluate the alternatives below before deciding.

For organizations evaluating whether vulnerability scanning belongs in their security program at all, the endpoint protection guide covers how periodic scanning fits alongside always-on endpoint detection tools.

Best Nessus alternatives by budget

For teams where $4,790/year is too steep, OpenVAS (free) covers core CVE detection and Action1 (free up to 200 endpoints) addresses patch-driven exposure — both with meaningful tradeoffs in depth and setup overhead.

If your budget is under $4,790/year and you have strong Linux skills, OpenVAS (Greenbone Community Edition) covers the core vulnerability detection use case at no cost — with the understanding that you will spend more time on setup, tuning, and keeping the feed current. If your budget cannot stretch to Professional and you primarily need to ensure patching is current, Action1 handles endpoint patch visibility for free up to 200 endpoints, which addresses a significant portion of the exposure that vulnerability scanning would surface.

If you need compliance auditing (CIS benchmarks, PCI-DSS, HIPAA), there is no credible free alternative to Nessus Professional. The compliance template depth in Nessus is one of the specific capabilities that justify the annual cost for regulated environments.

For a detailed feature and verdict comparison, see the full Tenable Nessus review.

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