# ThunderCam vs MergeHDR

The clearest difference is price: MergeHDR at Free against ThunderCam's $2.99. MergeHDR also leads on update cadence (every 5 days vs every 39 months). ThunderCam's advantage is in-app purchases (none vs 2) and iOS requirement (14.1 vs 18.0). On ads and device support there is nothing between them.

MergeHDR is free to download; ThunderCam costs $2.99 up front. MergeHDR sells 2 in-app purchases, starting at $9.99 per year. ThunderCam asks for nothing beyond the download.

ThunderCam ships an update every 39 months, MergeHDR every 5 days. The most recent releases landed on October 14, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | ThunderCam | MergeHDR |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/mergehdr/id6793486041/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 39 months | **Every 5 days** |
| Monetization | — | Free with in-app purchases |
| Size | 3 MB | 9 MB |
| Requires iOS | **14.1** | 18.0 |
| Devices | iPhone, iPod | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Tomasz Lukaszyk](https://appshunter.io/developer/1434196795) | [Sandro Gumz](https://appshunter.io/developer/1194790286) |

## What reviewers say

### ThunderCam

[App page](https://appshunter.io/ios/app/thundercam/id1565806764)

**Features:** Vision Pro support

**In-app purchases:** none


### MergeHDR

[App page](https://appshunter.io/ios/app/mergehdr/id6793486041)

Automatically finds and merges exposure-bracketed photos from your library. Offers manual control over alignment, deghosting, and tone-mapping for professional HDR results. All processing happens on your device for privacy and offline use.

**Highlights:** Automatic exposure bracket detection, Manual alignment and deghosting, Adjustable tone-mapping styles, Per-exposure layer control, On-device processing, Export to HEIC, Universal Purchase

**Features:** Family Sharing, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MergeHDR Pro (Yearly) | $9.99 | per year |
| MergeHDR Pro (Lifetime) | $19.99 | one-time |


## Frequently asked questions

### Is ThunderCam free?

ThunderCam costs $2.99, with no in-app purchases.

### Is MergeHDR free?

MergeHDR is free to download, with in-app purchases available.

### Do ThunderCam or MergeHDR have ads?

Neither ThunderCam nor MergeHDR shows ads.

### Which is updated more often, ThunderCam or MergeHDR?

ThunderCam ships an update every 39 months, and MergeHDR every 5 days. Most recently, ThunderCam was updated on October 14, 2026 and MergeHDR on October 24, 2026.

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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.*