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Tenable Nessus alternatives: 2 apps ranked by verified data

Facts checked Nov 1, 2026AppBreakup editorialHow we rank

Common reasons people leave Tenable Nessus: free licence lasts 30 days and covers only 5 IPs, and professional costs thousands per year. We ranked 2 alternatives by how directly each one replaces Tenable Nessus, then by reviews, real visits and how recently each app's facts were checked against its own website. ZAP currently ranks first.

Quick comparison

#AppPricingOpen sourcePlatformsVerified factsScore
1ZAP logoZAPOpen sourceYesWindows, macOS, Linux4 of 462.6
  1. ZAP logo

    1. ZAPTop pick

    Best for: Developers and AppSec teams who want free automated web scanning, including in CI

    Open sourceWindows, macOS, Linux

    62.6

    score / 100

    Why switch from Tenable Nessus

    Free and open source, a better fit if you mainly scan web applications.

    Pros

    • Free and open source, with the automated scanner included
    • Docker images and automation framework for CI pipelines
    • Add-on marketplace extends it

    Cons

    • Interface is dated and busier than Burp or Caido
    • Windows and Linux builds need Java 17 or newer installed
    • Releases are unsigned, so operating systems show warnings on install
    Visit ZAP Details and reviews
    How this score is calculated
    Editorial fit ×0.387
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.1585
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is ZAP a good Tenable Nessus alternative?

    Verified facts

    4 of 4 verified
    Price
    Free and open source
    Checked Oct 30, 2026zaproxy.org(opens source in a new tab)
    License
    Apache-2.0
    Checked Oct 30, 2026github.com(opens source in a new tab)
    Platforms
    Windows, Linux, macOS, Docker
    Checked Oct 30, 2026zaproxy.org(opens source in a new tab)
    Requirements
    Java 17+ on Windows and Linux
    Checked Oct 30, 2026zaproxy.org(opens source in a new tab)

The best Tenable Nessus alternative for…

The highest-ranked app in this list for each need.

ZAP logo

Best Tenable Nessus alternative for most people

ZAP

Free and open source, a better fit if you mainly scan web applications.

ZAP logo

Best Tenable Nessus alternative for a free option

ZAP

Free and open source, a better fit if you mainly scan web applications.

Burp Suite logo

Best Tenable Nessus alternative for a free plan you can upgrade

Burp Suite

The standard for hands-on web app testing, with an automated scanner in Pro.

ZAP logo

Best Tenable Nessus alternative for open source

ZAP

Free and open source, a better fit if you mainly scan web applications.

ZAP logo

Best Tenable Nessus alternative for Mac

ZAP

Free and open source, a better fit if you mainly scan web applications.

ZAP logo

Best Tenable Nessus alternative for Windows

ZAP

Free and open source, a better fit if you mainly scan web applications.

ZAP logo

Best Tenable Nessus alternative for Linux

ZAP

Free and open source, a better fit if you mainly scan web applications.

Tenable Nessus alternatives: common questions

What is the best alternative to Tenable Nessus?

ZAP ranks first right now. Free and open source, a better fit if you mainly scan web applications.

Is there a free alternative to Tenable Nessus?

Yes. ZAP (open source) and Burp Suite (free plan + paid) have a free option. Check each app's verified facts for current plan limits.

Is there an open-source alternative to Tenable Nessus?

Yes: ZAP.

Which Tenable Nessus alternatives work on Linux?

ZAP and Burp Suite run on Linux.

Why do people switch from Tenable Nessus?

The complaints we hear most: free licence lasts 30 days and covers only 5 IPs; professional costs thousands per year; cheaper editions are limited to non-commercial use.

How is this list ranked?

Every app is scored with the same published formula: how directly it replaces Tenable Nessus, reviews (weighted by verification), visits from AppBreakup, how recently its facts were checked against its own website, and reader votes.