toHDR vs DuoImage Viewer
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
toHDR
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toHDR instantly converts any photo into a bright, vivid HDR (High Dynamic Range) effect. Simple interface, easy to use. γCore Featuresγ β Convert any photo to standard HDR format. β Built-in sticker mode to enhance facial expressions. β Real-time preview, long press to compare with the original. β Adjust strength, highlights, shadows, color correction, and more. β Supports landscape editing, multi-device, and dark mode. γPro Benefitsγ - Unlimited photo exports. ----- Contact us: jerrycode@126.com Terms of Service: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://jerrycode.fun/docs/tohdr/privacy/
DuoImage Viewer
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DuoImage Viewer is a fast and efficient viewer built for VR and 360Β° panoramic photos. Browse all kinds of immersive images right on your iPhone or iPad. Supported Formats - VR180 / VR180 Fisheye - VR360 / VR360 Stereo - Stereo 3D (Side-by-Side / Top-Bottom) - Spatial Photo - HDR / Standard Photos Key Features - Smart Classification: Automatically detects image type on import and sorts by VR180, 360Β°, 3D, etc. - Immersive Viewing: Drag to rotate, pinch to zoom β a true VR panorama experience - Flat Mode: Switch back to the original image with one tap for comparison - Collections: Favorites + custom folders to organize your VR work - Batch Operations: Re-mark format, move to folder, batch favorite and delete - File Import: Import from system Photos library or Files app Highlights - Auto-detects major VR image metadata - Smooth thumbnail grid browsing - Dark mode support - Multi-language interface Privacy Commitment DuoImage Viewer collects no user data. All images are processed locally on your device. No network connection required β your photos and personal information never leave your device.
Screenshots
Verdict
The clearest difference is price: toHDR at Free against DuoImage Viewer's $1.99. DuoImage Viewer's advantage is in-app purchases (none vs 2). On ads, device support and iOS requirement there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
toHDR is free to download; DuoImage Viewer costs $1.99 up front. toHDR sells 2 in-app purchases, starting at $3.99 per month. DuoImage Viewer asks for nothing beyond the download.
| Parameter | toHDR | DuoImage Viewer |
|---|---|---|
| Price | Free β better | $1.99 |
| Update frequency | β | Every 5 weeks |
| Ads | No | No |
| In-app purchases | Yes | No β better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.6 β better | 18.6 |
| Further details β not scored | ||
| Size | 5 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | ε± θ | δ½ ζ¨ |
In-app purchases
toHDR
- Monthly Plan$3.991 Month
- Yearly Plan$9.991 Year
DuoImage Viewer
No in-app purchases









