Rhyven vs Sickle
A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.
Rhyven compared with Sickle
| Detail | 
Rhyven | 
Sickle |
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| What it does | Marketplace and runtime for headless, agent-first apps
| Email MCP server for Claude, Cursor and other AI agents to access every mailbox you own
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| Stage | Not given
| Not given
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| Founded | Not given
| Not given
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| Based in | Not given
| GB
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| Pricing model | Open source
| 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 | - Install agent-first apps without graphical interface
- Connect via MCP or REST protocols
- Browse and install from marketplace
- Run apps locally on your server or computer
- Share app results between connected agents
- Build custom apps using Python, JavaScript or containers
- Test improvements before reusing apps
- Keep apps private or publish to marketplace
- Optional runner to track tasks without model API agent
- Linux x86-64 and ARM64 support
| - 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 | - Data stays in your own environment
- Add tools without changing agent harness
- Multiple agents share results in same collection
- Agents can create tools by automating repeated work
- Open source with Apache 2.0 license
| - 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) | Not checked yet ▼ −1 (down) since last check | 13 ▲ +1 (up) since last check |
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| Trust Flow (Majestic) | 0 | 8 |
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| Citation Flow (Majestic) | 12 | 22 |
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| Referring domains (Majestic) | 21 | 17 |
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4 details filled in for both companies.
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