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Kakunin vs Sickle

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Kakunin compared with Sickle
DetailKakunin logo KakuninSickle logo Sickle
What it doesCryptographic identity and behavioral monitoring for AI agents in regulated industries Email MCP server for Claude, Cursor and other AI agents to access every mailbox you own
StageStartup Not given
Founded2025 Not given
Based inUS GB
Pricing modelFree trial Free trial
PricingStarter: $39/agent/month (minimum 5 agents, $195/month total); Professional: $99/agent/month (minimum 20 agents, $1,980/month total); Enterprise: custom pricing. 30-day free trial on all plans. Monthly: €8.99/month after 7-day free trial. Yearly: €30/year (€2.50/month equivalent, 72% savings). Includes both the Mac app and the MCP connector.
Key features
  • X.509 certificate issuance via AWS KMS with private keys stored in HSM
  • Real-time behavioral monitoring and drift detection across eight risk dimensions
  • Content-risk scoring of agent outputs per EU AI Act Article 5
  • Automatic certificate revocation when risk crosses 0.85 threshold within 60 seconds
  • Compliance reports mapped to NIST AI RMF, NIST CSF 2.0, ISO 27001, MiCA, and EU AI Act
  • Public verification endpoint with sub-500ms response and no authentication required
  • OpenTelemetry (OTLP) export to Datadog, Grafana, Honeycomb, and Splunk
  • RFC 8693 delegation chains and signed forensics
  • Webhook event delivery with HMAC signatures and audit logging
  • AgentMail: verifiable email inbox per certified agent for regulatory communication
  • Search across multiple mailboxes simultaneously
  • Read full email threads with conversation history
  • Move, archive and mark emails as read
  • Scoped permissions: read, change, and send separately
  • Attach files up to 18 MB to drafts and emails
  • Download and open email attachments
  • Native macOS mail client included
  • Support for multiple email providers
  • Encrypted file handling during transfer
  • Revoke access anytime within the hour
What makes it different
  • Only platform that issues cryptographic identity to deployed agents, monitors behavior in real time, and generates compliance reports as one unified product
  • X.509 certificates provide institutional trust standard used by banks and governments for 30+ years
  • Auto-revocation with sub-60-second SLA stops misbehaving agents without manual intervention
  • Content-risk scoring evaluates agent output language, not just actions, catching prompt injections and policy violations
  • Private keys never accessible; stored only in AWS KMS with cryptographic signing performed by KMS directly
  • Works with any MCP client, not locked to one AI platform
  • No installation required; works on macOS, Windows and Linux
  • Access unlimited email accounts simultaneously in one connection
  • Send emails with opt-in permission and approval workflow
Free planNot given Not given
Open sourceNot given Not given
PlatformsNot given Not given
Public APINot given Not given
Community votes00
DR (Domain Rating by Ahrefs)40 −1 (down) since last check13 +1 (up) since last check
Trust Flow (Majestic)98
Citation Flow (Majestic)3022
Referring domains (Majestic)25817

6 details filled in for both companies.

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