AISI DFIR vs NotRuler: 2026 Comparison
AISI DFIR is a commercial digital forensics and incident response tool by AISI. NotRuler is a free digital forensics and incident response tool. Compare features, ratings, integrations, and community reviews side by side to find the best digital forensics and incident response 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:
Mid-market and enterprise security teams that need to move fast on active incidents will find AISI DFIR's managed service model cuts through the hiring shortage for in-house forensics expertise. The Scout and Hunter tools automate evidence collection and persistence removal directly on affected systems, compressing response timelines that would otherwise stretch weeks. The caveat: this is a managed service first, so your team trades hands-on control for speed and specialist depth, making it less suitable for organizations that need full visibility and control over every forensic decision.
Exchange administrators defending against Ruler-based attacks need NotRuler because it's the only free tool that directly detects the client-side Outlook rules and VBScript forms that Ruler exploits, catching what most EDR and email gateway logs miss. The 94 GitHub stars and active development indicate it's trusted by practitioners who've actually hunted this attack chain. Skip this if your organization has already replaced Outlook client rules with Conditional Access policies or if you lack Exchange on-premises infrastructure; NotRuler solves a specific post-compromise detection problem, not general email security.
