Spacemail for Claude vs TestFlows Machine
A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.
Spacemail for Claude compared with TestFlows Machine
| Detail | 
Spacemail for Claude | 
TestFlows Machine |
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| What it does | Free MCP connector for Claude to access Spacemail email
| Run your programs deterministically. Record, replay, and branch your runs.
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| Stage | Not given
| Not given
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| Founded | Not given
| Not given
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| Based in | GB
| Not given
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| Pricing model | Open source
| Freemium
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| Pricing | Free
| Free: €0 with ₡3 credits included each month (about 20 vCPU-hours). Starter: €10/month with ₡25 credits (about 166 vCPU-hours). Plus: €25/month with ₡65 credits (about 433 vCPU-hours). Pro: €50/month with ₡150 credits (about 1,000 vCPU-hours). Dedicated: contact sales. Usage credits: €1 a credit, pu
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| Key features | - Check new mail across all mailboxes with message previews
- Search emails by sender, subject, words or date
- Read full email messages with attachment names
- Draft threaded replies and new emails saved to Drafts
- Mark messages as read or unread and flag important ones
- Archive, move or delete messages to Trash
- Works with Claude Desktop, Claude Code, Cursor and Windsurf
- Support for up to three mailboxes
- Drafts saved for manual review before sending
- Data stays on your computer, not collected by Norwich Website Design
| - Record runs with non-deterministic inputs pinned down
- Replay runs instruction-by-instruction
- Checkpoint and fork from any point
- Fault injection for disk, network, clock, containers and system calls
- Built-in debugger for machine programs
- Machine client and Python SDK
- Cloud storage for runs and disk images
- Multiple simultaneous sessions with configurable vCPUs
- Configurable session disk up to 256G
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| What makes it different | - Free and open-source under MIT licence
- Email content marked as untrusted to prevent phishing attacks
- Deleted messages go to Trash, not permanently deleted
- Independent project not affiliated with Spaceship or Spacemail
| - Deterministic replay of program runs with identical outcomes
- Fork and branch from any point without losing original timeline
- Comprehensive fault injection testing built-in
- Pay-as-you-go usage credits with free plan available
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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) | 44 ▼ −1 (down) since last check | 2 ● no change since last check |
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| Trust Flow (Majestic) | 0 | 4 |
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| Citation Flow (Majestic) | 4 | 21 |
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| Referring domains (Majestic) | 3 | 27 |
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5 details filled in for both companies.
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