# prefx vs Understudy

The clearest difference is update cadence: Understudy at every 5 days against prefx's every 3 weeks. prefx's advantage is ratings volume (3 vs 1). On price, rating, ads and in-app purchases there is nothing between them.

Both are free to download. prefx sells 3 in-app purchases, starting at $9.99 per month and Understudy sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for prefx against 5.0 for Understudy. Both are backed by a comparable volume of ratings — 3 and 1 respectively.

prefx ships an update every 3 weeks, Understudy every 5 days. The most recent releases landed on September 23, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | prefx | Understudy |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (3 ratings)](https://appshunter.io/ios/app/prefx/id6761247126/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/understudy-prop-phone/id6766074672/reviews) |
| Number of ratings | **3** | 1 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 5 days** |
| Monetization | Freemium | Free with in-app purchases |
| Size | 24 MB | 25 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 12+ | 12+ |
| Developer | [baffe, LLC](https://appshunter.io/developer/1888380312) | [Ginsberg AI LLC](https://appshunter.io/developer/1895990338) |

## What reviewers say

### 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 |


### Understudy

[App page](https://appshunter.io/ios/app/understudy-prop-phone/id6766074672)

This app transforms a spare iPhone into a customizable prop phone for film and video production. Create realistic lock screens, scripted message conversations, and on-cue incoming calls. It's designed to keep the screen awake during long takes, ensuring seamless filming.

**Highlights:** Customizable lock screen, Scripted message conversations, Triggered incoming calls/texts, Short-form video feed, Screen stays awake, Built-in editor

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Access | $29.99 | one-time |


## Frequently asked questions

### Is prefx free?

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

### Is Understudy free?

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

### Which has better reviews, prefx or Understudy?

prefx and Understudy are both rated 5.0 out of 5 on the App Store, from 3 and 1 ratings respectively.

### Do prefx or Understudy have ads?

Neither prefx nor Understudy shows ads.

### Which is updated more often, prefx or Understudy?

prefx ships an update every 3 weeks, and Understudy every 5 days. Most recently, prefx was updated on September 23, 2026 and Understudy on October 13, 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.*