HOL Guard vs Sickle

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

HOL Guard compared with Sickle
Detail	HOL Guard	Sickle
What it does	Runtime security layer that stops risky AI actions before they execute	Email MCP server for Claude, Cursor and other AI agents to access every mailbox you own
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	GB
Pricing model	Freemium	Free trial
Pricing	Free plan: Local Guard runtime with real-time approval prompts and local audit log. Solo $4.99/mo: adds 2 cloud-connected devices and 30-day cloud retention. Pro $15/mo: adds 5 cloud-connected devices, 180-day retention, and policy versioning. Team $30/seat/mo: up to 25 cloud-connected devices, 365-	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	Surface-specific pre-action interception Policy routing with allow, observe, ask, and block outcomes Local review and evidence workflows MCP, skill, plugin, and package inspection Layered local and team policy Open source runtime under Apache-2.0 Offline local protection without cloud connectivity Continuous GitHub leaked-secret monitoring Decision audit trail and export Support for multiple AI coding agents	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	Open-source core runtime runs locally without cloud requirement Protects against secrets, destructive commands, prompt injection, and supply chain attacks No source code or secrets uploaded; decisions stored as redacted summaries	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 plan	Not given	Not given
Open source	Not given	Not given
Platforms	Not given	Not given
Public API	Not given	Not given
Community votes	0	0
DR (Domain Rating by Ahrefs)	53 +1 (up) since last check	13 +1 (up) since last check
Trust Flow (Majestic)	27	8
Citation Flow (Majestic)	44	22
Referring domains (Majestic)	735	17

5 details filled in for both companies.

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