String Utility Belt 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.
String Utility Belt compared with Agent Caffeine
| Detail | 
String Utility Belt | 
Agent Caffeine |
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| What it does | Free online string and text tools for encoding, decoding, hashing, formatting and converting text in your browser
| Keep your Mac awake while AI agents work, also with the lid closed
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| Stage | Not given
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| Founded | 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 | - Base64 encoding and decoding
- URL encoding and decoding
- JSON formatting, validation and minifying
- JWT decoding with readable timestamps
- SHA-256 and other cryptographic hashing
- UUID generation with multiple versions
- Text diffing with multiple formats
- Chainable pipelines with live preview
- CSV to JSON and JSON to YAML conversion
- Regular expression explanation in plain English
| - 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 | - All processing happens in your browser with no data uploaded to servers
- Chain multiple tools into pipelines with live preview of each step
- Available across VS Code, CLI, MCP and as a Node.js library
- No cookies or tracking scripts, privacy-focused
- 248 utilities organized by category with guides and worked examples
| - 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
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| Open source | Not given
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| Platforms | 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) | 38 ▲ +1 (up) since last check | 11 ▲ +2 (up) since last check |
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| Trust Flow (Majestic) | 5 | 6 |
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| Citation Flow (Majestic) | 24 | 33 |
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| Referring domains (Majestic) | 18 | 8 |
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4 details filled in for both companies.
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