AgileBlue M365 Security vs s3tk: Side-by-Side Comparison (2026)
Features, pricing, ratings, and pros & cons — compared head-to-head.
AgileBlue M365 Security is a commercial cloud security posture management tool by AgileBlue. s3tk is a free cloud security posture management tool. Compare features, ratings, integrations, and community reviews side by side to find the best cloud security posture management fit for your security stack.
CST VerdictBased on our analysis of NIST CSF 2.0 coverage, core features, company size fit, deployment model, here is our conclusion:
Teams managing Microsoft 365 security across multiple workloads will find AgileBlue M365 Security worthwhile because it actually catches misconfigurations that break Exchange, Teams, and SharePoint at once instead of requiring separate tools. Continuous monitoring aligned with Microsoft and CISA baselines covers Entra ID through Power Platform, and the risk-based prioritization means you're not drowning in false positives. Skip this if your organization needs detection and response for active threats; AgileBlue prioritizes configuration drift and compliance posture, not incident hunting.
DevOps and security teams running S3-heavy AWS environments will get immediate value from s3tk because it's free, open-source, and requires no agent deployment or cloud integration,just point it at your buckets. The 461 GitHub stars and zero setup friction mean you can scan your entire S3 estate for misconfigurations, overpermissioned ACLs, and unencrypted data in minutes, not weeks. Skip this if you need continuous runtime monitoring or policy enforcement across your broader cloud infrastructure; s3tk is a scanner, not a guard rail, and works best as part of a larger CSPM rather than a replacement for one.
