A-LIGN Vulnerability Assessment Service is a commercial vulnerability assessment tool by A-LIGN. Semperis Purple Knight is a free vulnerability assessment tool by Semperis. Compare features, ratings, integrations, and community reviews side by side to find the best vulnerability assessment fit for your security stack.
Based on our analysis of NIST CSF 2.0 coverage, core features, company size fit, deployment model, here is our conclusion:
Mid-market and enterprise teams managing hybrid infrastructure will value A-LIGN Vulnerability Assessment Service for its ability to scan both on-premises and cloud environments in a single workflow without forcing tool consolidation. The service covers authenticated and unauthenticated scans across network and application layers with scheduled continuous monitoring, hitting both ID.RA and DE.CM in NIST CSF 2.0. Skip this if you need a platform that bundles remediation orchestration or threat intelligence; A-LIGN is assessment-focused, leaving remediation execution to your existing ticketing and patching systems.
Identity and access teams responsible for Active Directory or Entra ID hygiene should start with Purple Knight because it scans 185+ misconfigurations and risky admin patterns that your existing tools are likely missing, then delivers prioritized fixes instead of just a list of problems. The free model means no budget negotiation to run periodic scans across AD, Entra ID, and Okta simultaneously, making it genuinely low friction for gap assessment. Skip this if you need continuous runtime detection of lateral movement or persistence techniques; Purple Knight is a periodic scanner, not a monitor.
Vulnerability scanning service for network and application-level assessments
Free AD, Entra ID, and Okta security assessment tool for vulnerability scanning
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Common questions about comparing A-LIGN Vulnerability Assessment Service vs Semperis Purple Knight for your vulnerability assessment needs.
A-LIGN Vulnerability Assessment Service: Vulnerability scanning service for network and application-level assessments. built by A-LIGN. headquartered in United States. Core capabilities include Network layer vulnerability scanning, Application level vulnerability scanning, Authenticated and unauthenticated scans..
Semperis Purple Knight: Free AD, Entra ID, and Okta security assessment tool for vulnerability scanning. built by Semperis. headquartered in United States. Core capabilities include Scans for 185+ indicators of exposure and indicators of compromise, Security assessment for Active Directory, Entra ID, and Okta, Security report card with scores across five categories..
Both serve the Vulnerability Assessment market but differ in approach, feature depth, and target audience.
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