Nessus and Detectify are two security tools with distinct focuses and methodologies, designed to address different problems in the realm of cybersecurity. Nessus is primarily geared towards infrastructure vulnerability scanning, excelling in deep, authenticated scans for internal assets such as servers and workstations, and is known for its extensive plugin library useful for patch management and compliance auditing. However, its web application scanning capabilities are relatively new and less specialized, often leading to a higher volume of false positives due to its signature-based approach. In contrast, Detectify emphasizes providing users with comprehensive visibility and context of their attack surface, specifically targeting modern web applications and APIs. It employs a payload-based testing methodology, which minimizes false positives by confirming exploitability with each finding. Moreover, Detectify’s strength is bolstered by contributions from a community of ethical hackers and an AI agent, enabling it to detect novel vulnerabilities beyond common CVEs. This comparison is informed by feedback from clients and users transitioning from Nessus to Detectify, as well as official resources and documentation from Nessus.