AI21 vs Sickle
A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.
AI21 compared with Sickle
| Detail | 
AI21 | 
Sickle |
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| What it does | Post-train specialized models for your task, creating an AI edge your competitors can't buy
| Email MCP server for Claude, Cursor and other AI agents to access every mailbox you own
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| Stage | Established
| Not given
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| Founded | Not given
| Not given
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| Based in | IL
| GB
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| Pricing model | Contact for pricing
| 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 | - Forward-Deployed Researchers provide end-to-end model training and optimization
- Custom evaluation suite development from real tasks
- Production-ready deployment with cost-quality trade-offs
- Deployment flexibility including on-premises and VPC options
- Data security with no retention and full traceability
- Continuous model improvement from production traffic
- Customer ownership of model weights and training recipes
| - 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 | - Customers own specialized models trained on proprietary data, not rented general-purpose models
- Achieve frontier-level quality at lower costs through specialized training
- Five years of experience with diverse post-training and optimization methods
- Models ship production-ready in weeks with ongoing improvement capability
- Secure deployment with no data retention and auditable access controls
| - 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) | 75 ● no change since last check | 13 ▲ +1 (up) since last check |
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| Trust Flow (Majestic) | 22 | 8 |
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| Citation Flow (Majestic) | 44 | 22 |
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| Referring domains (Majestic) | 3529 | 17 |
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5 details filled in for both companies.
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