Intruder

Detectify

Detectify is an application security platform that performs dynamic vulnerability scanning across external attack surfaces, testing domains, IPs, APIs, and applications with payload-based techniques rather than relying solely on static signature matching. Its Surface Monitoring product continuously discovers and maps external assets while testing them for exploitable vulnerabilities. Detectify's API scanning uses Dynamic AI Fuzzing to test REST and GraphQL endpoints, and its Application Scanning performs deep, authenticated DAST testing with AI-powered fuzzing and crawling. A distinctive part of the platform is its Crowdsource network of more than 400 ethical hackers who feed newly discovered vulnerabilities, including many without an assigned CVE, into Detectify's scanner within minutes of research.

OWASP ZAP

ZAP (Zed Attack Proxy) is a free and open-source web application security scanner that started under the OWASP umbrella and is now stewarded by Checkmarx with independent open-source governance. It bills itself as the world's most widely used web app scanner, aimed at both security professionals doing manual penetration testing and developers who want automated security checks in CI/CD pipelines. ZAP works as an intercepting proxy that can passively and actively scan web traffic for vulnerabilities, and it can be extended through a marketplace of community-built add-ons. Its interface is designed to be approachable for people new to security testing while still offering the automation hooks experienced testers expect, and the project maintains an active GitHub repository ranked among GitHub's top open-source projects.

Tenable Nessus

Nessus is Tenable's vulnerability assessment scanner, used to discover vulnerabilities and misconfigurations across operating systems, network devices, and applications. It covers over 117,000 CVEs through more than 319,000 detection plugins, with roughly 100 new plugins released weekly, and prioritizes findings using CVSS v4, EPSS, and Tenable's own VPR risk scoring. The product ships with 450+ pre-built policy and compliance audit templates and guided remediation workflows to help teams act on results rather than just collect them. Nessus Professional and Nessus Expert are sold as annual subscriptions, with Expert adding external attack surface scanning and expanded web application scanning.

Qualys

Qualys is an enterprise cyber risk and security platform built to help organizations "measure, communicate, and eliminate cyber risk." Its flagship VMDR (Vulnerability Management, Detection and Response) product continuously and automatically discovers assets across a network, including endpoints, servers, cloud workloads, containers, and IoT devices, then scans and prioritizes vulnerabilities for remediation. The platform emphasizes consolidation, positioning itself as a way for organizations to streamline and automate security and compliance work onto a single cloud platform rather than juggling multiple point tools, aiming for greater agility, better outcomes, and lower cost. Qualys does not publish list pricing on its site; prospective customers request pricing through the company's sales team based on organization size and needed modules.

UpGuard

UpGuard is a cyber risk posture management platform that helps organizations identify and reduce security risk across their vendor relationships, attack surface, and internal workforce. It continuously scans a company's external digital footprint to surface exposed assets, misconfigurations, and vulnerabilities, and produces security ratings that can be used to benchmark and monitor third-party vendors over time. The platform is used by over 45,000 companies across financial services, healthcare, technology, and education, and includes a Trust Exchange feature that automates security questionnaire handling between organizations and their vendors. Additional modules cover user risk management, including shadow AI usage monitoring, with automation workflows for discovery, notification, and remediation driven through its API.