# i3DSteroid vs HDRI Prep

The clearest difference is price: i3DSteroid at $2.99 against HDRI Prep's $9.99. i3DSteroid also leads on update cadence (every 3 weeks vs every 9 months) and iOS requirement (15.0 vs 17.0). HDRI Prep's advantage is review sentiment (100% vs 76%). On ads, in-app purchases and device support there is nothing between them.

i3DSteroid costs $2.99 and HDRI Prep $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

i3DSteroid ships an update every 3 weeks, HDRI Prep every 9 months. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | i3DSteroid | HDRI Prep |
| --- | --- | --- |
| Price | **$2.99** | $9.99 |
| Rating | **[4.4 (38 ratings)](https://appshunter.io/ios/app/i3dsteroid/id467945370/reviews)** | — |
| Number of ratings | **38** | — |
| Positive reviews | 75.8% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 9 months |
| Monetization | **Free** | Paid |
| Size | 5 MB | 11 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Spmaker](https://appshunter.io/developer/467945373) | [Squirrel FX LLC](https://appshunter.io/developer/1557764202) |

## What reviewers say

### i3DSteroid

[App page](https://appshunter.io/ios/app/i3dsteroid/id467945370)

View and create stereoscopic images and videos on your iPhone, iPad, or iPod touch. Supports various input formats and display methods, including smart glasses. Offers tools for image adjustment, saving, and sharing.

**Highlights:** Auto-align L/R images, Supports SBS, MPO, and spatial photos, Multiple display methods (SBS, Anaglyph, Wiggle), Smart glasses support (XREAL Air2, VITURE One), Take L/R pictures with internal camera, Adjust L/R image positions and rotation, Save and slideshow displayed images

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

**In-app purchases:** none


### HDRI Prep

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

This utility helps visual effects professionals create HDRI bracketing sets for RICOH THETA 360 cameras. It allows for quick definition, organization, and reuse of bracket settings, streamlining on-set workflows for HDR photography.

**Highlights:** Define custom bracket sets (3-19 photos, 1-3 stops apart), Set Aperture, ISO, and Color Temperature for all photos at once, Define Center Shutter Speed to extend exposures, Name, organize, and reorder brackets by show, Duplicate and move bracket sets between shows, View photos read directly from the camera, Quickly adjust camera speaker volume and auto-sleep time

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is i3DSteroid free?

i3DSteroid costs $2.99, with no in-app purchases.

### Is HDRI Prep free?

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

### Do i3DSteroid or HDRI Prep have ads?

Neither i3DSteroid nor HDRI Prep shows ads.

### Which is updated more often, i3DSteroid or HDRI Prep?

i3DSteroid ships an update every 3 weeks, and HDRI Prep every 9 months. Most recently, i3DSteroid was updated on November 1, 2026 and HDRI Prep on October 30, 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.*