Free Active Directory Security Tool
Every Microsoft Identity.
Continuously Protected.
Find Identity Security Risks
Identify privilege escalations, AI agent abuse, policy changes, dormant account activity, and over 300 integrated threat detections.
Monitor Identity Changes
Track identity and AI Agent activity continuously instead of relying on periodic scans and reports.
Get Real-Time Security Alerts
Receive immediate notifications when risky, suspicious, or unauthorized identity changes occur.
Investigate Threats Faster
See who or which agent made a change, what changed, when it happened, and where it originated.
Secure Non-Human Identities
Monitor and protect AI identities, service principals, applications, and automated accounts.
Scale Without Limits
Monitor Microsoft identity objects across multi-domain, multi-forest, and multi-tenant environments at no cost.
What Protector Detects
Stay ahead of attackers by leveraging the over 300 pre-built threat detections in Cayosoft Protector. New threats are pushed live into your instance and ready to use. No pre-configurations required.
300+
Built-in Detections
Need Support?
Visit the Guardian Protector Reddit Community for product support, troubleshooting, and to engage yours peers and Cayosoft product engineers.
Need instant rollback or forest‑wide disaster recovery?
Upgrade path:
Rollback, automated remediation, unlimited change monitoring, and customer alerts
Cayosoft Guardian™
Patented instant recovery of entire AD forests in minutes
Cayosoft Guardian Instant Forest Recovery™
2026 Cybersecurity Stars Award for Most Innovative Ransomware Recovery Platform
Inc.’s 2026 Best Workplaces Award
American Business Awards 2026 Gold Stevie® Award
Microsoft Security Excellence Awards 2026 Finalist
Global InfoSec 2026 Editor’s Choice Cyber Resilience Award
2025 Enterprise IT Awards Product of the Year
2024 InfoWorld Technology of the Year
Ready to Protect Your Hybrid Identities?
Download the only free, continuous monitoring and real-time threat detection for Active Directory, Entra ID and Microsoft 365.
Additional Resources
Frequently Asked Questions
Active Directory security is the practice of protecting Active Directory from unauthorized access, excessive privileges, misconfigurations, malicious changes, and policy tampering. It includes monitoring users, groups, permissions, service accounts, and policies to identify security risks, maintain compliance, and strengthen identity resilience against cyberattacks.
A third-party Active Directory tool can centralize monitoring, alerts, and change context across Active Directory, Entra ID, Microsoft 365, Intune, and Exchange Online rather than asking administrators to investigate separate native logs and consoles.
Guardian Protector is a free, agentless Active Directory security tool that provides continuous assessment, real-time threat detection, change monitoring, and audit visibility across Active Directory, Entra ID, and Microsoft 365.
An Active Directory security assessment identifies misconfigurations, excessive privileges, stale accounts, policy weaknesses, and other identity risks that could expose your environment to attack.
Unlike traditional Active Directory security assessment tools that provide a point-in-time snapshot, Guardian Protector continuously assesses Active Directory, Entra ID, and Microsoft 365 to identify new risks as they are introduced.
It is both. Guardian Protector continuously assesses your identity environment for security weaknesses while also providing real-time monitoring, threat detection, alerting, and identity change tracking.
Many free tools perform periodic scans and generate assessment reports. Guardian Protector continuously monitors for risky changes, suspicious activity, privilege escalation, and policy modifications, providing visibility between assessment cycles
Guardian Protector detects privilege escalation, dormant account activity, GPO and policy changes, suspicious delegations, unauthorized deletions, permission changes, and indicators of exposure, compromise, and attack.
No. Guardian Protector is 100% agentless and can begin monitoring your environment without deploying agents to domain controllers or endpoints.
No. Guardian Protector operates in a read-only mode and does not modify Active Directory or Entra ID. It provides detection, alerting, assessment, and visibility without changing production systems.
Guardian Protector focuses on continuous security assessment, monitoring, alerting, and threat detection. Cayosoft Guardian adds rollback, remediation, object recovery, unlimited retention, SIEM integration, and patented Active Directory forest recovery capabilities.
Follow the quick-start steps in product help and check out our How-To-Resources. When you’re ready for remediation features, upgrading is seamless. Support is also available on Reddit and YouTube.