Cybersecurity Qualys Nmap Network Scanner

Qualys vs Nmap

Pallavi Vishwakarma

member of technical staff

Apr 26 2023

3 min reading

Qualys vs Nmap
Figure 1

Qualys and Nmap are two of the most widely used tools by security experts for network scanning. While both tools are capable of scanning networks for security flaws and threats, there are differences between them in terms of their functionality, features, and cost. In this blog post, we will compare Qualys and Nmap to help you choose the tool that best fits your needs.




Qualys is a cloud-based security and compliance platform that offers a variety of tools for web application security, compliance management, and vulnerability management. The ability to scan networks for security risks and vulnerabilities is one of Qualys' key features.


Based on the verified Qualys reviews on platforms like G2 and Capterra, It’s the ease of deployment of the cloud agent and cloud agent in general.


While some reviews are positive, some Qualys customers say that getting support is painful, and not any meaningful updates to the platforms we use (VMDR, PCI, WAS, FIM) aside from them breaking out pre-existing modules into new stand-alone services that they then add as new SKUs ( and want to charge extra $$$). For example, instead of improving the existing, native asset management/inventory management module that is included with VMDR, they build a new Cyber Security Asset Management (CSAM) platform, designate the old one as a "legacy" module, and now charge extra for the new one.




Nmap, short for "Network Mapper", is a popular open-source tool for network scanning and port discovery. Nmap is highly versatile and can be used for a wide range of purposes, including network exploration, vulnerability scanning, and penetration testing.


Nmap provides a wide range of scanning options, including TCP and UDP ports scanning, version detection, and OS fingerprinting. The tool can also be used for service and application discovery, It can even be used to map out an entire network topology.


Based on the verified Nmap reviews on platforms like G2 and Capterra, Network Mapper (Nmap) is the best scanning tool used for reconnaissance and network scanning purposes, it will help to identify open/closed ports, OS detection, fingerprinting, and many other things useful for exploitation. 


But some Nmap users say that as it is an open source tool, nmap is easily blocked by other security devices like firewalls, WAF, IPS, etc. If you scan your target multiple times then sometimes it will show different results.


Qualys or Nmap? Which is better?


Choosing between Qualys and Nmap largely depends on your specific needs and preferences. If you require a comprehensive cloud-based platform that provides a wide range of scanning options, then Qualys may be the better choice. On the other hand, if you require a highly configurable and versatile tool that can be customized to specific needs, then Nmap may be the better option.


One factor to consider when choosing between Qualys and Nmap is cost. Qualys is a commercial product that requires a subscription, while Nmap is open-source and free to use. While Qualys provides a wide range of features and capabilities, it may not be the most cost-effective solution for smaller organizations or individual users.


Another factor to consider is the ease of use. Qualys' cloud-based platform provides a user-friendly interface and requires minimal technical expertise to use. Nmap, on the other hand, is a command-line tool that may require more technical expertise to use effectively.


Ultimately, both Qualys and Nmap are highly capable and widely used network scanning tools that can help identify vulnerabilities and security threats. It is worth noting that many security professionals use both tools in their testing workflows, as each tool has its strengths and weaknesses.


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