Kastra vs Sublime Security
Side-by-side comparison of features, pricing, and ratings
Kastra or Sublime Security: which should you choose?
| Dimension | Kastra | Sublime Security |
|---|---|---|
| Pricing | Freemium (free local tier + paid cloud control plane) | Contact for pricing (enterprise, custom quote) |
| Primary Use Case | Runtime authorization for AI coding agents (e.g., Claude Code, Cursor) | Agentic email security against BEC and phishing |
| Deployment | macOS GUI app + CLI + cloud control plane (US, EU, AP regions); self-hosted/air-gapped available | Cloud-based, integrates with Microsoft 365 and Google Workspace |
| Key Feature | Real-time policy enforcement (shell, file, network, database, browser) with sub-ms latency | Autonomous Security Analyst (ASA) for triage and Autonomous Detection Engineer (ADÉ) for auto-authoring detections |
| Audit & Compliance | Ed25519-signed append-only audit trail, SIEM streaming (Datadog, Splunk, S3) | Full transparency with evidence-backed verdicts; custom detection rules via Sublime Script |
| Best For | Development teams, platform engineers, DevSecOps, solo developers using AI coding agents | Enterprise security teams, SOC analysts, detection engineers targeting email threats |
Runtime authorization for AI agents — allow, deny, redact, or hold every action before it executes
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Agentic email security that auto-triages phishing reports and drafts backtested detections
Visit WebsiteWho should pick Kastra, and who should pick Sublime Security?
- Solo developer using Claude Code locallyPick: Kastra
Kastra's free macOS GUI app and CLI provide zero-setup runtime authorization, preventing destructive commands without slowing workflows.
- Enterprise SOC analyst fighting BECPick: Sublime Security
Sublime's ASA and ADÉ automate triage and detection authoring, giving transparent, evidence-backed verdicts to reduce false positives.
- Platform team enforcing governance on AI agentsPick: Kastra
Kastra's cloud control plane with SIEM streaming and signed audit trails enables consistent policy enforcement across teams.
- Detection engineer needing custom email rulesPick: Sublime Security
Sublime Script (YARA-like) allows writing precise detections for targeted phishing, with full transparency into each verdict.
- DevSecOps integrating AI agent security into CI/CDPick: Kastra
Kastra's policy-as-code approach and sub-ms PDP fit into automated pipelines, with self-hosted options for air-gapped environments.
Frequently Asked Questions
Can Kastra protect against email-based attacks like phishing?
No. Kastra is designed for AI coding agents, not email. For email security, consider Sublime Security.
Does Sublime Security control AI coding agents?
No. Sublime focuses on email security (BEC, phishing) and does not integrate with coding agents like Claude Code or Cursor.
Which tools are supported by Kastra?
Kastra supports Claude Code, Cursor, Codex CLI, and OpenClaw. For other agents, custom SDK work may be needed.
Is Sublime Security a replacement for existing email gateways?
Sublime targets advanced threats like BEC and novel phishing, often supplementing or replacing legacy gateways for mid-to-large enterprises.
Can I try Kastra for free?
Yes. Kastra offers a free tier with local governance via macOS app/CLI. Paid cloud and self-hosted plans are available.
Does Sublime offer a free trial?
Pricing is contact-based; a free trial may be available upon inquiry, but it's not publicly stated.
What compliance features does Kastra provide?
Kastra provides ed25519-signed append-only audit trails that can be streamed to SIEMs like Datadog, Splunk, and S3.
What integrations does Sublime support?
Sublime integrates with Microsoft 365 and Google Workspace, with an API for programmatic access.
What else are Kastra and Sublime Security compared with?
These two products are not competitors — they solve unrelated problems for unrelated buyers, so a head-to-head pick doesn't really exist. Choose ScreenMind if you're a macOS user who wants a free, pri
Where can you read more about Kastra and Sublime Security?
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