Responsive Tool 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.
Responsive Tool compared with Spacemail for Claude
| Detail | 
Responsive Tool | 
Spacemail for Claude |
|---|
| What it does | Free responsive website checker for mobile, tablet and desktop
| 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 | Free
| Open source
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| Pricing | Not given
| Free
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| Key features | - Test multiple device viewports simultaneously
- Real CSS viewport rendering
- Share setup links
- Custom pixel width testing
- No installation required
- Sync scroll across panes
- Browser-based with no account needed
| - 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 | - Compare multiple real device widths side by side instead of switching one at a time
- Faster than DevTools for checking several device sizes at once
- Entirely browser-based with no setup, signup or download
- Built and maintained by one developer in the open
| - 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) | 1 | 0 |
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| Citation Flow (Majestic) | 25 | 4 |
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| Referring domains (Majestic) | 14 | 3 |
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4 details filled in for both companies.
More alternatives to Responsive Tool More alternatives to Spacemail for Claude