Acunetix Alternatives (2026): 7 Web Scanners Compared

Acunetix is a well-established dynamic application security testing (DAST) tool: you point it at a web application and it crawls and probes for vulnerabilities automatically. It is a capable product, but it is commercial, and many teams start looking for an alternative once they weigh the licensing cost against how much of it they actually use. This guide compares seven credible alternatives, honestly, and explains which fits which situation.

Why look for an Acunetix alternative?

The usual reasons are straightforward:

• Cost. Commercial DAST licences are a significant line item, especially for smaller teams or a handful of sites.
• Scope mismatch. A full DAST suite is a lot of tool if what you really need is to find exposed hosts, check TLS, and watch for new issues on your external surface.
• Workflow. Some teams prefer an open-source scanner they can script into CI, or a manual toolkit for hands-on testing, rather than a heavyweight automated product.

Match the alternative to that reason and the choice gets easy.

The 7 best Acunetix alternatives

1. OWASP ZAP — best free DAST

ZAP (Zed Attack Proxy) is the leading free, open-source web application scanner. It offers active and passive scanning, an intercepting proxy, and automation for CI pipelines. For teams that want Acunetix-style automated web scanning without a licence, ZAP is the natural first stop — at the cost of more hands-on setup and tuning.

2. Burp Suite — best for manual testing

PortSwigger's Burp Suite is the industry standard for hands-on web application testing. The Community edition is free with limited automation; Burp Suite Professional is a paid subscription and adds an automated scanner. Choose Burp when a human tester drives the process and you want the best manual toolkit, rather than fully unattended scanning.

3. Nuclei — best for fast, scriptable checks

Nuclei (by ProjectDiscovery) is a free, open-source scanner driven by community-maintained YAML templates. It is fast, easy to run in automation, and excellent for checking large numbers of hosts against known CVEs and misconfigurations. It is not a full crawler, so it complements rather than fully replaces a DAST — but it is a superb free building block.

4. Nikto — best simple web server scanner

Nikto is a long-standing free, open-source web server scanner that checks for outdated software, dangerous files, and common misconfigurations. It is simple and quick, though noisy and narrower than a modern DAST. It works well as a fast first look at a server.

5. Intruder — best managed external scanner

Intruder is a commercial cloud-based vulnerability scanner aimed at continuous external and internal scanning with a low-maintenance, managed feel. It suits teams that want commercial scanning and alerting without operating the scanner themselves, on a subscription model.

6. Qualys WAS — best enterprise platform

Qualys Web Application Scanning is part of the broader Qualys cloud platform. It is an enterprise-grade option for large organisations that want web app scanning integrated with wider vulnerability management and compliance. It carries enterprise pricing and complexity to match.

7. Secably — best for free tools + affordable external monitoring

Secably takes a different angle from a full DAST. It provides free, on-demand security tools — a website vulnerability scanner, subdomain finder, SSL checker, and more — plus affordable continuous monitoring of your external attack surface. It is not an enterprise authenticated DAST and does not try to be. It fits teams that mainly want to discover exposed assets, run quick checks for free, and be alerted when something changes on their public-facing surface — see the monitoring plans.

Acunetix alternatives compared

Which Acunetix alternative should you choose?

• Want a free replacement for automated web scanning? Start with OWASP ZAP, add Nuclei for fast templated checks.
• Doing hands-on penetration testing? Burp Suite is the standard.
• Want commercial scanning without running it yourself? Look at Intruder, or Qualys WAS at the enterprise end.
• Mainly need to find exposed assets and watch your external surface affordably? Try Secably's free tools and continuous monitoring.

The honest answer is that many teams use more than one: a free scanner for depth, plus lightweight external monitoring so nothing new slips through unnoticed. You can start right now with the free website vulnerability scanner — no account required.

How we compared these tools

This comparison groups tools by the job they actually do rather than treating them as interchangeable "scanners." A DAST like Acunetix or OWASP ZAP crawls and actively tests a running application. A template scanner like Nuclei checks known signatures fast. A manual toolkit like Burp is driven by a tester. External monitoring watches your public surface over time. Those are different jobs — the right Acunetix alternative is the one that matches the job you are trying to do, which is why "best free alternative" and "best enterprise alternative" are different answers. Pricing is described by model (free, subscription, enterprise) rather than exact figures, because commercial vendors quote per application, per user, or per asset and those numbers change.

Frequently asked questions

Is there a free alternative to Acunetix?

Yes. OWASP ZAP is the leading free, open-source DAST and the closest free equivalent for automated web scanning. Nuclei and Nikto are also free and open-source, and Secably offers free on-demand scanners. The trade-off with free tools is more setup and tuning versus a packaged commercial product.

What is the best Acunetix alternative for a small team?

Small teams usually get the furthest with a free scanner (OWASP ZAP or Nuclei) for depth plus lightweight external monitoring so new exposures are caught automatically. That combination covers most needs without an enterprise licence.

How does Acunetix compare to OWASP ZAP?

Both are DAST scanners. Acunetix is a polished commercial product with vendor support and a managed experience; OWASP ZAP is free and open-source with comparable core scanning but more hands-on configuration. Teams choosing on budget lean ZAP; teams paying for support and packaging lean Acunetix.

Do I still need a scanner if I have external monitoring?

They complement each other. A scanner tests an application in depth at a point in time; continuous external monitoring watches your whole public surface for new or changed exposures between those tests. Many teams run both.