Nessus review

Nessus is Tenable’s vulnerability scanning product. In one Reddit discussion, a user describes Nessus as the scanning engine; Tenable.io adds cloud management for scanners, scan setup, dashboards and reports. That distinction matters: the published Tenable homepage describes Tenable One, an exposure management platform, not Nessus. Its claims about exposure visibility across cloud, identity, OT and other areas should not be read as a description of Nessus itself.

The pricing page lists two Nessus licenses. Professional includes unlimited vulnerability scanning and real-time vulnerability updates. Expert adds web application scanning and external attack surface discovery scanning. The listed one-year prices are $4,790 for Professional and $6,790 for Expert. Dividing those totals by 12 gives annual-equivalent prices of $399.17 and $565.83 per license per month, respectively; the page does not list monthly billing.

The clearest selling point in the published material is scan volume: Professional includes unlimited vulnerability scanning, and a Reddit commenter says Nessus Pro allows scans of an unlimited number of assets. That can make the license easier to budget than a product priced per asset, though the pricing page does not specify an asset cap or confirm that detail.

Expert is the more relevant tier for teams that need web application and external attack surface discovery scans; those are listed features, not capabilities we can attribute to Professional. The one-year license prices are stated plainly, with two- and three-year totals also published: Professional is $9,330.95 for two years or $13,637.54 for three; Expert is $13,208.13 or $19,304.19.

Some Reddit users favor Tenable when they need broader coverage than a Windows-only setup, including network hardware and non-Windows systems. That is user opinion, not a guarantee of coverage for every environment. Another commenter’s comparison is useful for choosing the right product: standalone Nessus may suit a limited set of servers, while a cloud platform may fit teams needing multiple scanners and centralized dashboards.

The entry price is a real hurdle: Professional costs $4,790 for one year, and the pricing page does not list a free plan or trial. Expert raises the one-year bill to $6,790. These are license totals, not monthly subscriptions, and the annual-equivalent figures should not be mistaken for monthly billing. Advanced Support is listed as an add-on, but its price is not published.

Nessus also appears less suited to teams that want centralized management out of the box. A Reddit commenter contrasts standalone Nessus with Tenable.io’s cloud management, dashboards and consolidated scan data. Those comments are user reports, and the published pricing details do not specify management features, user limits or scanner limits for either Nessus plan.

Reporting is another concern raised by a Reddit commenter, who said Nessus required substantial data cleanup to report issues to asset owners. For a mostly Windows environment, some Reddit users argue that Microsoft Defender may be the cheaper fit. The trade-off depends on coverage needs; the published sources do not provide a direct, like-for-like cost comparison.

The pricing page lists Nessus Professional at $4,790 for a one-year license, or $399.17 per month when that total is divided by 12. It includes unlimited vulnerability scanning and real-time vulnerability updates. Nessus Expert costs $6,790 for one year, an annual equivalent of $565.83 per month. That is a $2,000 annual jump over Professional. Expert adds web app scanning and external attack surface discovery scanning, alongside Professional features.

These are per-license prices, not monthly billing. The page also lists two- and three-year totals: Professional is $9,330.95 and $13,637.54; Expert is $13,208.13 and $19,304.19. There is no free plan, and a free trial is not listed. Nessus Advanced Support is available as an add-on, but its price is not published. Budget for the license before treating support as included: the published pricing details do not say that it is.

The published material does not document migration steps, data-export formats, APIs, or how much work it takes to move scan history and configuration into or out of Nessus. It also does not specify contract or renewal terms beyond the listed one-, two- and three-year license totals. So we can’t confirm how portable your existing data is or whether switching creates lock-in; ask Tenable for export details and a migration plan before signing.

There are no Reddit posts or comments in the published sources, so we can’t credibly say what tends to make users leave. The vendor's homepage describes Tenable One, not Nessus, and does not fill in those product or migration details. For a switch decision, verify which Nessus license covers your needs, what happens to scan records and settings at renewal or cancellation, and whether the destination tool can use your current data. Treat those as questions to resolve, not documented Nessus limitations.