Sickle vs AINRA
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 AINRA
| Detail | 
Sickle | 
AINRA |
|---|
| What it does | Email MCP server for Claude, Cursor and other AI agents to access every mailbox you own
| The identity layer for autonomous AI
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| Stage | Not given
| Startup
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| Founded | Not given
| 2026
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| Based in | GB
| Not given
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| Pricing model | Free trial
| Open source
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| 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.
| Not given
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| 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
| - Offline verification in milliseconds
- Cryptographic passports for agents
- Revocation under 60 seconds
- Authority classes and assurance tiers
- No central authority calls required
- Local registrar lifecycle
- Request signing with short-lived keys
- Public conformance testing
- Fail-closed HTTP gating
- Appeal mechanism for revocation
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| 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
| - Neutral non-profit root barred by charter from issuing credentials or computing scores
- Fully open standard with published conformance vectors and reproducible releases
- Verification runs offline without phoning home to any authority
- Four independent implementations agreeing on all conformance vectors
- Public recorded ceremony to establish the root across independent custodians
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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) | 13 ▲ +1 (up) since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 8 | 0 |
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| Citation Flow (Majestic) | 22 | 0 |
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| Referring domains (Majestic) | 17 | 0 |
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4 details filled in for both companies.
More alternatives to Sickle More alternatives to AINRA