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Free Acunetix alternatives: 3 apps ranked by verified data

Facts checked Nov 8, 2026AppBreakup editorialHow we rank

3 of the 6 Acunetix alternatives we track can be used for free (free, open source, or with a free plan). Burp Suite, ZAP and Intruder rank highest, with facts last verified Nov 8, 2026.

Quick comparison

#AppPricingVerified priceOpen sourcePlatformsVerified factsScore
1Burp Suite logoBurp SuiteFree plan + paid$499 (Burp Suite Professional)NoWindows, macOS, Linux7 of 768.8
2ZAP logoZAPOpen source—YesWindows, macOS, Linux4 of 464.8
3Intruder logoIntruderFree plan + paid—NoWeb6 of 657.5
  1. Burp Suite logo

    1. Burp SuiteTop pick

    Best for: Pentesters and bug bounty hunters doing hands-on web application testing

    Free plan + paidWindows, macOS, Linux

    68.8

    score / 100

    Why switch from Acunetix

    Combines a capable automated scanner with the manual testing tools most web pentesters already use.

    Pros

    • Industry-standard proxy, Repeater and Intruder workflow
    • Free Community Edition for learning and manual testing
    • Large extension library and free training from PortSwigger

    Cons

    • The scanner and full-speed Intruder require the paid Professional licence
    • Community Edition can't save projects
    • Java-based UI can be heavy on memory during big tests
    Visit Burp Suite Details and reviews
    How this score is calculated
    Editorial fit ×0.3100
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.15100
    Votes ×0.150

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

    Is Burp Suite a good Acunetix alternative?

    Verified facts

    7 of 7 verified
    Free edition
    Community Edition
    Checked Nov 8, 2026portswigger.net(opens source in a new tab)
    Pro-only features
    Project files, full Intruder, vulnerability scanner
    Checked Nov 8, 2026portswigger.net(opens source in a new tab)
    Billing
    Yearly licence terms
    Checked Nov 8, 2026portswigger.net(opens source in a new tab)
    Owner
    PortSwigger Ltd
    Checked Nov 8, 2026portswigger.net(opens source in a new tab)
    Starting price
    $499 (Burp Suite Professional)
    Checked Nov 8, 2026portswigger.net(opens source in a new tab)
    Free plan
    Yes, Community Edition
    Checked Nov 8, 2026portswigger.net(opens source in a new tab)
    Free trial
    Yes (Professional)
    Checked Nov 8, 2026portswigger.net(opens source in a new tab)
  2. ZAP logo

    2. ZAP

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

    Open sourceWindows, macOS, Linux

    64.8

    score / 100

    Why switch from Acunetix

    Free, open-source web app scanner with active scanning, spidering and CI automation, no licence needed.

    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 ×0.15100
    Votes ×0.150

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

    Is ZAP a good Acunetix alternative?

    Verified facts

    4 of 4 verified
    Price
    Free and open source
    Checked Nov 8, 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 Nov 8, 2026zaproxy.org(opens source in a new tab)
    Requirements
    Java 17+ on Windows and Linux
    Checked Nov 8, 2026zaproxy.org(opens source in a new tab)
  3. Intruder logo

    3. Intruder

    Best for: Small and mid-sized companies that need easy external and cloud scanning for compliance

    Free plan + paidWeb

    57.5

    score / 100

    Why switch from Acunetix

    Combines web app scanning with infrastructure and cloud checks, plus a free tier.

    Pros

    • Free plan and 14-day trial with no sales call
    • Combines several scanning engines with its own checks
    • Clear reports suited to SOC 2 and ISO 27001 evidence
    • Monthly or annual billing

    Cons

    • Internal network scanning only on Pro and Enterprise plans
    • Per-target licences add up for large estates
    • Lighter on internal enterprise networks than Qualys or Tenable
    Visit Intruder Details and reviews
    How this score is calculated
    Editorial fit ×0.363
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.15100
    Votes ×0.150

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

    Is Intruder a good Acunetix alternative?

    Verified facts

    6 of 6 verified
    Free plan
    Yes
    Checked Nov 8, 2026intruder.io(opens source in a new tab)
    Free trial
    14 days
    Checked Nov 8, 2026intruder.io(opens source in a new tab)
    AI pentests
    From $3,500 per test
    Checked Nov 8, 2026intruder.io(opens source in a new tab)
    Scanning engines
    Nuclei, OpenVAS, Tenable
    Checked Nov 8, 2026intruder.io(opens source in a new tab)
    Internal scanning
    Pro and Enterprise only
    Checked Nov 8, 2026intruder.io(opens source in a new tab)
    AI pentest
    From $3,500 per test
    Checked Nov 8, 2026intruder.io(opens source in a new tab)