Overview
ShareWatcher and Kastra are both security-focused tools, but they address fundamentally different domains. ShareWatcher is a file share monitoring solution for Windows and FTP environments, providing visibility into who accesses files and when changes occur. Kastra is a runtime authorization layer for AI agents, deciding what actions an AI can take before they execute. This comparison highlights their distinct features, use cases, and ideal audiences.
Feature Comparison
| Feature | ShareWatcher | Kastra |
|---|---|---|
| Primary Function | Monitors Windows file shares and FTP servers for access and changes | Runtime authorization layer for AI agents, deciding actions before execution |
| Target Users | Network administrators, IT security teams managing shared files | AI developers, platform teams, compliance officers governing AI agents |
| Monitoring Scope | Local and remote Windows File Shares, FTP servers | AI agent actions: prompts, tool calls, shell commands, API requests, browser actions |
| Alerting | Email, sound notifications, Windows event logs, custom commands | Real-time decision logging, signed audit trail, SIEM integration |
| Automation | QuickMove to relocate new files, trigger custom scripts | Policy-based allow/deny decisions, human approval checkpoints |
| Latency | Not specified (file system monitoring) | Sub-millisecond (p99 < 1ms) decision latency |
| Deployment | Windows-based, on-premises | Cloud, self-hosted, air-gap; CLI and macOS GUI |
| Integration | Windows File Shares, FTP servers | Claude Code, Cursor, Codex, OpenClaw, Anthropic SDK, OpenAI SDK, and more |
| Compliance | Not explicitly mentioned | SOC 2, ISO 27001, HIPAA, GDPR, EU AI Act, FedRAMP |
| Audit Trail | Windows Event Logs | Signed, append-only audit vault with ed25519 signatures |
Pricing
ShareWatcher offers a free trial; pricing is not explicitly listed on the website but is likely a one-time license or subscription for Windows-based deployment.
Kastra offers a free tier for solo developers, with paid plans for teams and enterprises. Pricing details are not fully public but are available via demo request.
Pros and Cons
ShareWatcher
Pros:
- Easy to set up and use for Windows file share monitoring
- Real-time alerts via multiple channels (email, sound, events)
- Automates file relocation with QuickMove feature
- Tracks user access and file changes on local and remote shares
- Supports both Windows and FTP servers
Cons:
- Limited to Windows and FTP environments only
- No AI or agent governance capabilities
- Lacks modern compliance certifications (SOC 2, etc.)
- No cloud or cross-platform deployment options
Kastra
Pros:
- Sub-millisecond decision latency for AI agent actions
- Comprehensive policy enforcement across prompts, tools, and outputs
- Supports multiple AI frameworks (Claude, OpenAI, OpenClaw, etc.)
- Strong compliance posture with SOC 2, HIPAA, GDPR, etc.
- Signed, append-only audit trail for regulatory requirements
Cons:
- Focused exclusively on AI agents, not general file monitoring
- Requires integration with AI agent frameworks
- Pricing may be higher for enterprise deployments
- Newer product with evolving ecosystem
Verdict
ShareWatcher and Kastra serve entirely different purposes. ShareWatcher is ideal for IT administrators who need to monitor Windows file shares and FTP servers for security and automation. Kastra is essential for teams deploying AI agents that require runtime authorization and compliance governance. Choose ShareWatcher for traditional file monitoring; choose Kastra for AI agent safety and control.