# HDRI Prep vs prefx

The clearest difference is price: prefx at Free against HDRI Prep's $9.99. prefx also leads on update cadence (every 3 weeks vs every 6 months). HDRI Prep's advantage is in-app purchases (none vs 3) and iOS requirement (15.0 vs 17.0). On ads and device support there is nothing between them.

prefx is free to download; HDRI Prep costs $9.99 up front. prefx sells 3 in-app purchases, starting at $9.99 per month. HDRI Prep asks for nothing beyond the download.

HDRI Prep ships an update every 6 months, prefx every 3 weeks. The most recent releases landed on September 10, 2026 and June 27, 2026 respectively.

## The numbers

| Metric | HDRI Prep | prefx |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/prefx/id6761247126/reviews)** |
| Number of ratings | — | **3** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 3 weeks** |
| Monetization | — | Freemium |
| Size | 1 MB | 24 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Squirrel FX LLC](https://appshunter.io/developer/1557764202) | [baffe, LLC](https://appshunter.io/developer/1888380312) |

## What reviewers say

### HDRI Prep

[App page](https://appshunter.io/ios/app/hdri-prep/id1616103466)

**Features:** Vision Pro support

**In-app purchases:** none


### prefx

[App page](https://appshunter.io/ios/app/prefx/id6761247126)

Transform your device into an interactive digital prop for film and video production. Customize on-screen content, simulate social media feeds, and utilize professional VFX tools for seamless on-set integration and post-production.

**Highlights:** Interactive prop themes, Customizable UI and social media simulation, Professional VFX tools (Chroma Key, Markers), On-set utility (Emissive Lighting, Status Bar Control), Privacy-focused, offline ready, Global language support

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| prefx Monthly | $9.99 | per month |
| prefx Annual | $59.99 | per year |
| prefx Lifetime | $99.99 | one-time |


## Frequently asked questions

### Is HDRI Prep free?

HDRI Prep costs $9.99, with no in-app purchases.

### Is prefx free?

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

### Do HDRI Prep or prefx have ads?

Neither HDRI Prep nor prefx shows ads.

### Which is updated more often, HDRI Prep or prefx?

HDRI Prep ships an update every 6 months, and prefx every 3 weeks. Most recently, HDRI Prep was updated on September 10, 2026 and prefx on June 27, 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.*