Responsive Tool 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.
Responsive Tool compared with ASO Engine
| Detail | 
Responsive Tool | 
ASO Engine |
|---|
| What it does | Free responsive website checker for mobile, tablet and desktop
| Research App Store keywords, translate metadata with your own OpenAI key, and review global pricing
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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
| 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 | - 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
| - 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 | - 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
| - 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
| 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 | 9 ▼ −3 (down) since last check |
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| Trust Flow (Majestic) | 1 | 7 |
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| Citation Flow (Majestic) | 25 | 20 |
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| Referring domains (Majestic) | 14 | 6 |
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4 details filled in for both companies.
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