Responsive Tool vs Agent Caffeine
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 Agent Caffeine
| Detail | 
Responsive Tool | 
Agent Caffeine |
|---|
| What it does | Free responsive website checker for mobile, tablet and desktop
| Keep your Mac awake while AI agents work, also with the lid closed
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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
| TR
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| Pricing model | Free
| Free trial
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| Pricing | Not given
| Free for 7 days. After trial: $9 once (launch price), full price $14. One payment covers up to 3 Macs. Includes 1 year of updates.
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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
| - Detects 40+ AI coding agents automatically
- Keeps Mac awake with lid closed
- Pause for 30 minutes, 1 hour, or until tomorrow
- Stay reachable for 1, 2, or 4 hours
- Display dims as lid closes
- Sound notification when lid closes
- iPhone hotspot fallback when Wi-Fi drops
- Battery level indicator in menu bar
- Command-line integration and MCP server support
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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
| - Agent-aware sleep prevention knows when your agents work and only keeps Mac awake during actual work
- Closes lid without waking Mac or draining battery
- Automatic iPhone hotspot switching when Wi-Fi drops
- Works on up to 3 Macs with one lifetime purchase
- No subscription required after one-time purchase
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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 | 11 ▲ +2 (up) since last check |
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| Trust Flow (Majestic) | 1 | 6 |
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| Citation Flow (Majestic) | 25 | 33 |
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| Referring domains (Majestic) | 14 | 8 |
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4 details filled in for both companies.
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