String Utility Belt vs ASO Engine
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 ASO Engine
| Detail | 
String Utility Belt | 
ASO Engine |
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| What it does | Free online string and text tools for encoding, decoding, hashing, formatting and converting text in your browser
| Research App Store keywords, translate metadata with your own OpenAI key, and review global pricing
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| Stage | Not given
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| Founded | Not given
| Not given
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| Based in | Not given
| US
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| Pricing model | Free
| Free
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| Pricing | Not given
| $0 free to use for the current release. OpenAI API usage for AI translation is billed separately to your API account.
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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
| - Keyword research with estimated popularity and difficulty scores
- Competitor analysis showing public app listings and keyword rankings
- App rank tracker for monitoring position by country
- Metadata translation using your own OpenAI API key
- Price Parity for reviewing in-app purchase and subscription pricing across territories
- Protected Keychain credential storage
- Apple Silicon and Intel Mac support
- Native Mac app with no browser dashboard required
- Drafts and review workflow before publishing changes
- macOS 15 or later 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
| - Native Mac app designed specifically for App Store research workflow, not a web dashboard
- You control your own credentials and API keys stored in the Mac's Data Protection Keychain
- Use your own OpenAI key for metadata translation with no separate AI service subscription
- Review and edit translations and pricing changes as drafts before publishing to App Store Connect
- No account or checkout required to download and use the current free release
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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 | 9 ▼ −3 (down) since last check |
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| Trust Flow (Majestic) | 5 | 7 |
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| Citation Flow (Majestic) | 24 | 20 |
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| Referring domains (Majestic) | 18 | 6 |
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4 details filled in for both companies.
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