HDRI Prep vs prefx
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
HDRI Prep
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HDRI Prep is a small utility for use in visual effects for creating HDRI bracketing sets for RICOH THETA 360 cameras, specifically, the V, Z1 and X. (If you don't know what all that is than this app probably isn't for you.) Different bracket settings are needed for different production situations. The THETA cameras does do multi-image exposure bracketing that you can set with the iPhone THETA app, but modifying them is painfully slow and difficult and you can't save sets and reuse them later. I wrote this to fill that need and speed up use of the THETA on set for taking HDRIs. With HDRI Prep you can: • Define brackets as X number of photos (3 to 19, always odd numbers) taken X stops apart (1 to 3) rather than setting each photo’s parameters individually • Pick the camera and you can set the Aperture, ISO and Color Temperature for all the photos at once with the settings limited to what the camera can actually execute • Pick a Center Shutter Speed and the bracket extends exposures equally higher and lower • Custom name brackets, organize by show, drag and drop reorder them, move between shows, and duplicate them as needed • View the photos taken read from the camera Quickly modify the Camera’s speaker volume and time it takes to auto-sleep (up to 60 minutes so watch your battery) HDRI Prep is not intended to be a full featured replacement for other THETA iPhone apps. It is designed only to fill a hole in the current functionality of the official THETA app (and what 3rd party apps I've played with): to make a library of Bracket settings, a method of organizing them, and a way to call them up and use them quickly on set. As such you will find it is missing various functions of the official THETA app. Those extended features may be added at some later date, but I make no promises. I recommend using it in conjunction with other apps as needed. Some limitations of the app: • Currently this only works with a direct Wifi connection to the camera (camera hosting Wifi) and it assumes the ip address is 192.168.1.1. • Image viewing is minimal. You can see what is on the camera (heads up, it's slow to load) but I am leaving the downloading and deleting of images up to other apps. You can use the official THETA app or you can manage them on a Mac using Image Capture (you're on your own with Windows). • Be aware that adjusting the camera shutter sound volume and the sleep delay time writes these changes to the camera, overwriting any previous camera setting. If you change the sleep time to 10 minutes it will stay that way even when HDRI Prep isn't connected or running. • If you want to see a live count of the images as they are taken you can actually switch to the official THETA app after beginning a capture. I hope to add this to my interface in the future.
prefx
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.
- 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
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Stop losing production time to dead screens. Prefx transforms your iPhone or iPad and any external display connected via USB-C/HDMI into a high-fidelity, interactive digital prop. Built by baffe, a creative production company, Prefx is the professional on-set tool designed to bridge the gap between live-set interaction and post-production precision. Interactive Prop Themes A library of fully customizable modules for every narrative need, governed by a global Clearance Toggle and tunable via the Signature Secret Menu. • Stitch (Custom UI): Import your own designs or video plates to create a seamless, scrollable custom surface. • Strike Up (Social Media): Scrollable feeds, profile grids, and realistic interactions for on-camera talent. • Live Feed: Social broadcast simulation with looping video, scrolling comments, and animated viewer counts. • Chatterbox: Scripted messenger simulations with adjustable reply timing, on-the-fly actor typing, and instant reset between takes. • News: Scrollable digital news site with authentic headline and article layouts. • CineVault: A high-fidelity VOD interface for "watching" content on-camera, now with full external display control, living where it was always meant to: your TV. Clearance — Hero Mode vs. Villain Mode One toggle flips every theme for legal clearance. • Hero Mode: Platform-native typography and iconography for brand-consistent "good guy" devices. • Villain Mode (True Neutral): 100% brand-neutral interface using open-source Inter typography and Lucide iconography, for antagonists or high-risk clearances. Professional VFX Tools • Chroma Key: High-visibility green, blue, and middle-grey backgrounds with optimized luminance for clean keying, fully supported on external displays so you can tune directly on the screen you're shooting against. • Precision Markers: High-contrast markers for rock-solid matchmoving in After Effects, Mocha, or DaVinci Resolve, with full external display size support. • Interactive Plates: Move tracking markers in real-time to simulate a live interface for the actor. • UI Saturation: Desaturate interfaces on the fly to prevent color blowout on set cameras and specific LUTs. On-Set Utility • Emissive Lighting: Use any screen as a practical light source. Dial in color temperature with a Kelvin slider or use the RGB wheel for creative effects — now across any display size via external output. • Status Bar Control: Set time, battery, signal, and wifi to exactly what the scene needs, across any theme, take after take. • Privacy First: No data collection. No cloud processing. All assets stay local. • Offline Ready: No internet required once installed. • Global Support: Full UI in 12 languages. Why Prefx? Reduce screen replacements. Simplify legal clearances. Give your actors something real to react to. Your VFX artists and your lawyers will thank you. Subscription Information • Unlock all professional screen templates and future updates with a Prefx Pro subscription. • Plans: Monthly or Annual auto-renewable subscriptions, or a one-time Lifetime License. • Payment: Charged to your Apple ID account at confirmation of purchase. • Auto-Renewal: Monthly and Annual plans renew automatically unless canceled at least 24 hours before the end of the current period. • Manage or cancel anytime via Account Settings on the App Store. • Previously purchased? Use the Restore Purchases button on the unlock screen. Developed by baffe, LLC. All templates are original. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.baffefilms.com/privacy
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | HDRI Prep | prefx |
|---|---|---|
| Price | $9.99 | Free — better |
| Rating | — | 5.0 (3 ratings) — better |
| Number of ratings | — | 3 — better |
| Update frequency | Every 6 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Freemium |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 1 MB | 24 MB |
| Age rating | 4+ | 12+ |
| Developer | Squirrel FX LLC | baffe, LLC |
In-app purchases
HDRI Prep
No in-app purchases
prefx
- prefx Monthly$9.991 Month
- prefx Annual$59.991 Year
- prefx Lifetime$99.99





