The Best Free Vulnerability Scanners in 2026

Cyberpresso data: Toolradar evaluated 18 vulnerability scanning tools for its ranking, updated October 2026. Free scanners look free on the landing page, and the fine print decides the bill.

That fine print sits in three places: how many IPs or apps the free tier covers, whether a company may use it, and how much of the work your team does itself. We read those three on each vendor page where the page states them, on 10 October 2026.

We priced the options for a commercial team with 50 external IPs and 3 web apps over one year. Our penetration testing guide covers the testing side of the same budget.

How we ranked: most of these tools cost nothing to license, so the order follows scope.

A free option moves up when its free plan covers more of the 50 IPs and 3 apps, and when a company may use it. Nessus Professional, the paid benchmark, sets the cost of the scenario.

A vulnerability scanner probes systems, web applications or networks for known flaws and misconfigurations, then reports each one with a severity. A free scanner is either an open-source tool with no license fee or the free tier of a commercial product.

The free part almost always carries a limit: a cap on IPs or apps, a bar on commercial use, or features held back for paid plans. The license is free. The time to run, tune and act on the output is not. For the wider category, see our SIEM tools guide.

Free scanners fall into two groups.

Network scanners look for flaws on hosts and services, which is what 50 IPs need. Web application scanners test a site from the outside, which is what the 3 apps need. A team with both kinds of asset usually needs one of each, so this page ranks tools by the scope they cover, not by one shared list.

A free tool that covers the wrong scope costs more than the paid one. A free tier capped at 5 IPs leaves 45 of 50 IPs to another tool, a second process or nobody. The bill that does not appear in a price table is staff time: setup, scheduled runs, patching the scanner itself and triaging the findings.

A security lead should put that time next to any license quote before calling a tool free. The same staff-time question runs through our SIEM cost guide.

Commercial-use terms matter for the same reason. A license that forbids company use turns a free install into a compliance problem.

Every price here was checked on the vendor's own page on 10 October 2026. Tenable lists Nessus Professional as a one-year license on its Nessus page. For the scenario, the cost is one license for one year, the Professional line in the pricing table.

No IP cap is stated for Professional, so the figure assumes one license covers all 50 IPs. Confirm that with Tenable before buying.

Essentials Plus is $199 a year for 20 IPs, and Tenable says both Essentials tiers are for non-commercial use.

Greenbone lists its paid OPENVAS BASIC plan at 2,524 EUR a year on its community page.

We did not convert euros, so that plan sits outside the dollar ranking. OWASP ZAP, Wazuh and Nuclei show no license fee, so their cost at the scenario is staff time, which this table does not price.