Comparison

toHDR vs DuoImage Viewer

Price, ratings, monetisation and update history for both apps, side by side β€” with what reviewers say about each.

Head to head
About

toHDR

Features
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toHDR instantly converts any photo into a bright, vivid HDR (High Dynamic Range) effect. Simple interface, easy to use. 【Core Features】 β—Ž Convert any photo to standard HDR format. β—Ž Built-in sticker mode to enhance facial expressions. β—Ž Real-time preview, long press to compare with the original. β—Ž Adjust strength, highlights, shadows, color correction, and more. β—Ž Supports landscape editing, multi-device, and dark mode. 【Pro Benefits】 - 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/

About

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

toHDR3 screens
DuoImage Viewer4 screens

Verdict

The call

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

CostPrice Β· In-app purchases Β· Ads Β· Monetization

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.

Scorecard2 real differences Β· 4 level
toHDR versus DuoImage Viewer: the parameters behind the verdict, then further details
ParametertoHDRDuoImage Viewer
PriceFree β€” better$1.99
Update frequencyβ€”Every 5 weeks
AdsNoNo
In-app purchasesYesNo β€” better
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.6 β€” better18.6
Further details β€” not scored
Size5 MB2 MB
Age rating4+4+
Developer展 θˆ’δ½™ 杨

In-app purchases

2 purchases

toHDR

Subscriptions2
  • Monthly Plan$3.991 Month
  • Yearly Plan$9.991 Year
None

DuoImage Viewer

No in-app purchases

Questions

Is toHDR free?
toHDR is free to download, with in-app purchases available.
Is DuoImage Viewer free?
DuoImage Viewer costs $1.99, with no in-app purchases.
Do toHDR or DuoImage Viewer have ads?
Neither toHDR nor DuoImage Viewer shows ads.

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