A Quick List of Free & Open Source Website Security Checkers (2025)

aydinasuh

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I've been interested in monitoring tools for a long time. You could say it's part of my job, as I'm involved in a SaaS project of this kind. Now I want to give you a list that I think you'll find useful. With this list, you can audit your website's security issues.

By the way, a small note... None of the tools I tried to add to the list are paid. I believe we should support all initiatives that offer Open Source and completely free tools.



OWASP ZAP (Zed Attack Proxy) ( https://www.zaproxy.org/ ) A powerful open-source tool from the Open Web Application Security Project (OWASP). It's great for finding common vulnerabilities like XSS and SQL Injection. ZAP works as a proxy to intercept traffic and has both automated scanning for beginners and advanced features for manual penetration testing.


Nikto: ( https://github.com/sullo/nikto ) This is a classic open-source web server scanner. Nikto checks for thousands of potentially dangerous files, outdated server versions, and other common security misconfigurations. It's a fantastic tool for getting a quick overview of your server's security health from an external perspective.


Qualys SSL Labs SSL Test ( https://www.ssllabs.com/ssltest/ ) A must-use free online service for anyone running a website on HTTPS. It performs a deep analysis of your SSL/TLS certificate configuration and grades it from A+ to F. It helps you identify weak ciphers, incorrect certificate chains, and other issues that could make your secure connection vulnerable.


Sucuri SiteCheck A popular free online scanner that checks your website for known malware, blacklist status, and common security issues. It's a very quick way to see if your site has been flagged by major security authorities or if it contains malicious code.


OpenVAS (Greenbone Vulnerability Manager) For those who want a more comprehensive and self-hosted solution, OpenVAS (now part of Greenbone Vulnerability Manager's free community edition) is a full-featured vulnerability scanner. It goes beyond web applications to check your network and server infrastructure for a wide range of security risks using a regularly updated feed of tests.

For those who are a bit more professional or want a more detailed list, you can also check the list here. I generally got these tools from there as well.
 
Great list, many thanks for sharing! I can attest to the reliability of ZAP and Nikto because I have personally used them, particularly for fast scans during staging. OpenVAS is a powerful tool for conducting more thorough infrastructure checks. It's wonderful to see open-source and free tools receiving recognition; I've bookmarked this for use in audits in the future.
 
Great list, many thanks for sharing! I can attest to the reliability of ZAP and Nikto because I have personally used them, particularly for fast scans during staging. OpenVAS is a powerful tool for conducting more thorough infrastructure checks. It's wonderful to see open-source and free tools receiving recognition; I've bookmarked this for use in audits in the future.
Being helpful made me happy. Thank you for your interest.
 

Nice roundup! I’d also throw in Wfuzz for custom fuzzing and Arachni for a lightweight Ruby-based scanner. For TLS deep dives, testssl.sh is a killer CLI tool. All open-source, all free just plug, play, and audit away.

 
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