Comet vs Sickle
A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.
Comet compared with Sickle
| Detail | 
Comet | 
Sickle |
|---|
| What it does | The AI Developer Platform
| 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 | 2017
| Not given
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| Based in | US
| GB
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| Pricing model | Not given
| 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 | - LLM trace logging with 40+ integrations
- Automatic error detection and diagnostics
- Ollie agent for code fix recommendations
- Test Suites and 40+ LLM-as-a-judge evaluation metrics
- Production dashboards and alerts for agents
- Prompt playground and optimization
- Agent Playground for local agent development
- Cost intelligence for Claude Code and Codex tracking
| - 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 | - Truly open-source platform with enterprise-grade infrastructure
- Traces appear almost instantly even at high volumes
- Flexible hosting options including self-hosted, cloud, and custom deployments
- Easy integration with just a few lines of code
- Opik automatically turns trace data and eval results into code fixes
| - 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) | 74 ▲ +1 (up) since last check | 13 ▲ +1 (up) since last check |
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| Trust Flow (Majestic) | 28 | 8 |
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| Citation Flow (Majestic) | 51 | 22 |
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| Referring domains (Majestic) | 4448 | 17 |
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4 details filled in for both companies.
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