ASO Engine vs CurlyJSON
A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.
ASO Engine compared with CurlyJSON
| Detail | 
ASO Engine | 
CurlyJSON |
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| What it does | Research App Store keywords, translate metadata with your own OpenAI key, and review global pricing
| JSON Formatter & Validator — Free, Private & Offline
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| Stage | Not given
| Not given
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| Founded | Not given
| Not given
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| Based in | US
| Not given
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| Pricing model | Free
| Freemium
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| Pricing | $0 free to use for the current release. OpenAI API usage for AI translation is billed separately to your API account.
| Free for all tools. Pro: $29.99 per year or $4 per month, plus tax.
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| Key features | - 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
| - 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
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| What makes it different | - 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
| - 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
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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) | 9 ▼ −3 (down) since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 7 | 7 |
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| Citation Flow (Majestic) | 20 | 13 |
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| Referring domains (Majestic) | 6 | 2 |
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5 details filled in for both companies.
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