Sickle vs ActionBox

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 ActionBox
Detail	Sickle	ActionBox
What it does	Email MCP server for Claude, Cursor and other AI agents to access every mailbox you own	Human approval infrastructure for AI agents and automation workflows
Stage	Not given	Not given
Founded	Not given	Not given
Based in	GB	Not given
Pricing model	Free trial	Freemium
Pricing	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.	Developer: Free forever with 250 Actions/month, 3 Sources, 3 Watches, 7-day history. Pro: $10/month ($120/year, save 17%) with 1,000 Actions/month, unlimited Sources, 20 Watches, 30-day history, additional Actions at $8 per 1,000-pack. Team: $49.17/month ($590/year, save 17%) with 5,000 Actions/mont
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	Typed decisions (Boolean, choice, text, number, rating, structured forms) Heartbeat Watches for silent-work detection Action Controls for safe follow-up operations Multi-surface inboxes (web, mobile, Slack, CLI, MCP) Model Context Protocol (MCP) integration Signed receipts and durable decision history Mobile app for iOS (15+) with push alerts Slack approval integration (Beta) CLI with bounded long-poll waiting Integration guides for GitHub Actions, n8n, LangGraph, OpenAI Agents SDK
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	Durable decision records that survive client disconnections and restarts Reduces median approval time significantly in production environments Unified API across multiple approval surfaces without building custom dashboards Source-scoped identity for independent credential rotation across runners Built-in monitoring for stalled background work with heartbeat watches
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)	13 +1 (up) since last check	5 no change since last check
Trust Flow (Majestic)	8	7
Citation Flow (Majestic)	22	24
Referring domains (Majestic)	17	42

5 details filled in for both companies.

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