Intruder

Intruder has earned the highest G2 rating in this comparison, 4.8 from 87 reviews, by solving a specific problem that enterprise vulnerability scanners often ignore: making findings genuinely understandable to SMB IT teams without dedicated security specialists on staff. Rather than producing a technical report full of CVSS scores and jargon, Intruder prioritises and explains findings in plain language that a generalist IT administrator can act on directly, and the continuous monitoring that automatically rescans when new cloud infrastructure or open ports appear means coverage stays current without manual scan scheduling. This combination of clarity and continuous automation has made it a genuinely popular choice for growing technology companies pursuing their first SOC 2 or ISO 27001 certification.

The honest scope limitation is that Intruder is built around external attack surface monitoring specifically. Internal network scanning depth across complex, segmented enterprise infrastructure is narrower than Tenable or Qualys, and there is no native patch management beyond clear prioritisation guidance.

The verdict: Intruder is right for SMBs and growing technology companies wanting continuous, genuinely understandable external attack surface monitoring. Large enterprises needing comprehensive internal network scanning should evaluate Tenable or Rapid7 InsightVM instead.

Last reviewed: September 2026

Strongest: Risk prioritisation

Watch out for: Remediation workflows

Best for

SMBs and growing technology companies wanting continuous, easy to understand external attack surface monitoring without dedicated security specialists to interpret complex findings.

Not suitable for: Large enterprises needing comprehensive internal network vulnerability scanning across complex, segmented infrastructure.