# toHDR vs DuoImage Viewer

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.

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.

## The numbers

| Metric | toHDR | DuoImage Viewer |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | — | Every 5 weeks |
| Size | 5 MB | 2 MB |
| Requires iOS | **17.6** | 18.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [展 舒](https://appshunter.io/developer/1803985128) | [余 杨](https://appshunter.io/developer/6784909940) |

## What reviewers say

### toHDR

[App page](https://appshunter.io/ios/app/tohdr/id6746218392)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Plan | $3.99 | per month |
| Yearly Plan | $9.99 | per year |


### DuoImage Viewer

[App page](https://appshunter.io/ios/app/duoimage-viewer/id6788791560)

**In-app purchases:** none


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*