Fulcra vs Sickle
A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.
Fulcra compared with Sickle
| Detail | F
Fulcra | 
Sickle |
|---|
| What it does | The user-owned context backend for AI agents
| Email MCP server for Claude, Cursor and other AI agents to access every mailbox you own
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| Stage | Growing
| Not given
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| Founded | Not given
| Not given
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| Based in | US
| GB
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| Pricing model | Freemium
| Free trial
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| Pricing | Not given
| 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.
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| Key features | - One user-owned context for every agent
- Agents wake up to what changed since their last loop
- Readable, traceable context with every change logged
- End-to-end encryption with AES-256
- Granular sharing controls with revocable access
- Right to export, delete, and transparency
- Context that travels across AI products and models
| - 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
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| What makes it different | - User-owned context that travels with you across AI products
- Traceable agent activity with full visibility and control
- Agents coordinate through shared context without learning being trapped in silos
- End-to-end encryption with no data selling
| - 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
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| Free plan | Not given
| Not given
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| Open source | Not given
| Not given
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| Platforms | Not given
| Not given
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| Public API | Not given
| Not given
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 37 ▲ +3 (up) since last check | 13 ▲ +1 (up) since last check |
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| Trust Flow (Majestic) | 20 | 8 |
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| Citation Flow (Majestic) | 40 | 22 |
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| Referring domains (Majestic) | 593 | 17 |
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5 details filled in for both companies.
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