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Sickle vs fractal

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

Sickle compared with fractal
DetailSickle logo Sickle fractal
What it doesEmail MCP server for Claude, Cursor and other AI agents to access every mailbox you own Long-term memory for AI agents that organizes itself and corrects itself
StageNot given MVP
FoundedNot given Not given
Based inGB SE
Pricing modelFree trial Free
PricingMonthly: €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. Personal: Free during early access. Unlimited memories, all agents with separate memories, no card required. Enterprise: On request, set up by the team for departmental organization with cross-department sharing and direct support.
Key features
  • 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
  • Self-correcting memory that updates when facts change
  • Historical memory queries with time-based retrieval
  • Automatic topic organization and hierarchy
  • Separate memory for each agent with controlled sharing
  • Multi-agent support via MCP, REST API, or LangGraph
  • AES-256 encryption at rest and in backups
  • OAuth 2.1 authentication and API key management
  • Data export and deletion capabilities
  • 37 MCP tools with automated verification on every code change
What makes it different
  • 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
  • Understands what changed, when it was true, and where it belongs - beyond vector database similarity
  • Never contradicts itself by automatically replacing outdated facts
  • Fully GDPR aligned with built-in privacy by design
  • Two-minute integration with Claude, ChatGPT, Cursor and any MCP client
  • Data stays in Europe on AWS eu-north-1 and never used for model training
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)13 +1 (up) since last checkNot checked yet no change since last check
Trust Flow (Majestic)80
Citation Flow (Majestic)220
Referring domains (Majestic)170

6 details filled in for both companies.

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