CurlyJSON vs Spacemail for Claude
A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.
CurlyJSON compared with Spacemail for Claude
| Detail | 
CurlyJSON | 
Spacemail for Claude |
|---|
| What it does | JSON Formatter & Validator — Free, Private & Offline
| Free MCP connector for Claude to access Spacemail email
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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 | Freemium
| Open source
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| Pricing | Free for all tools. Pro: $29.99 per year or $4 per month, plus tax.
| Free
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| Key features | - Validate JSON with precise line and column errors
- Repair invalid JSON fixing trailing commas, quotes, and comments
- Preserve large integers without rounding
- Detect and mask API keys, tokens and passwords
| - 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
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| What makes it different | - Keeps large numbers exactly as written instead of silently rounding them like most online formatters
- All free tools run entirely in your browser, working offline without uploading data
- Automatically detects and warns about secrets like API keys and passwords
| - 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
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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 ● no change since last check | 44 ▼ −1 (down) since last check |
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| Trust Flow (Majestic) | 7 | 0 |
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| Citation Flow (Majestic) | 13 | 4 |
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| Referring domains (Majestic) | 2 | 3 |
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5 details filled in for both companies.
More alternatives to CurlyJSON More alternatives to Spacemail for Claude