The AppCheck alternative for unified exposure management
AppCheck is a powerful tool for deep application and infrastructure scanning. Intruder helps lean teams go further - bringing vulnerability scanning, cloud security posture, and continuous discovery into one platform so nothing falls between the cracks.
Complete visibility across your entire environment
AppCheck provides thorough DAST and infrastructure scanning with a first-principles testing methodology. Intruder takes a different approach, combining application and API testing with continuous asset discovery, infrastructure scanning, and cloud security posture in a single platform. Teams get one prioritised view across their external perimeter, cloud accounts, and applications.
Continuous discovery, not periodic scans
Intruder continuously monitors for new assets across your external and cloud environments, triggering scans automatically when something changes.
Audit-ready compliance reports, instantly
Track cyber hygiene and generate instant, audit-ready reports for SOC 2 or ISO 27001. Sync evidence directly with Drata and Vanta.
Find assets you did not know were exposed
Uncover forgotten subdomains, Shadow IT, and orphaned services that sit outside your known inventory.
Trusted by thousands of companies worldwide
Scan web applications and APIs for real vulnerabilities
Intruder’s DAST scanner tests web applications, single-page apps, and APIs for critical security flaws including injection, cross-site scripting, and broken authentication. Teams can scan behind login pages with authenticated testing and upload OpenAPI or Swagger schemas for API coverage.
Findings appear alongside infrastructure and cloud results in one prioritised view, so teams can see how application vulnerabilities relate to their broader exposure rather than managing them in a separate tool.
Know your full attack surface, continuously
Intruder continuously discovers assets across your external and cloud environments, identifying new subdomains, IPs, and cloud instances as they appear. When changes are detected, adaptive scanning automatically triggers a vulnerability check, keeping cloud sprawl and Shadow IT under control without manual intervention.
Secure your cloud from the inside out
An external scan shows what’s exposed. Intruder integrates directly with your AWS, Azure, and Google Cloud accounts to audit the configuration itself, pinpointing insecure permissions, risky network access controls, and misconfigured storage. Teams can fix the root cause driving exposure rather than chasing symptoms visible from outside.
Focus on what attackers will exploit first
Visibility is only useful if it leads to action. Intruder prioritises findings based on exploit likelihood by blending CVSS and EPSS scores, helping teams concentrate on vulnerabilities most likely to be weaponised within the next 30 days rather than chasing low-impact findings.
Faster response to emerging threats
When critical vulnerabilities like MOVEit or Ivanti Connect Secure emerge, hours matter. Intruder's Emerging Threat Scans proactively scan your environment for specific new threats as soon as checks are available, closing the gap between disclosure and detection. AppCheck's VulnFeed takes a different approach, delivering regular signature updates for known CVE coverage.
Move from findings to action without friction
Intruder integrates with Slack, Jira, and Github to keep remediation moving. GregAI, Intruder’s AI security analyst, triages findings, explains root causes in plain language, and drafts remediation notes so teams can close issues faster without specialist security expertise.
Intruder checks your systems for 75+ web-layer security problems (such as SQL injection and cross-site scripting), 140,000+ infrastructure weaknesses (such as remote code execution flaws), and other security misconfigurations (such as weak encryption configurations, and systems which are unnecessarily exposed). Learn more about what checks we run.
Intruder’s emerging threat scans check your systems for newly discovered vulnerabilities automatically. This kind of proactive action is essential for businesses that don’t have processes in place to research the latest threats and manually run scans for them. Learn more.
Our team of experienced penetration testers will seek to identify serious weaknesses in your external targets that are undetectable by scanners. Continuous penetration testing is a bolt-on service available to Enterprise users and is sold and booked by the day. Learn more.
Intruder is powered by industry-leading scanners, including Tenable, Nuclei, OpenVas, and ZAP. Learn more.
