i3DSteroid vs HDRI Prep
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
i3DSteroid
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.
- 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
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[i3DSteroid] is a stereoscopic Universal application for iPhone/iPad/iPod touch. - Auto-alignment L/R images - Input file : L/R independent,SBS,MPO,spatial photos - Over 1000 images WEB Galleries access - Display method : SBS,Mirror,2D,Anaglyph,wiggle,etc - Support for smart glasses such as XREAL Air2/VITURE One - Save displayed image. - Slide Show - Take L/R pictures with the internal camera. - Adjust L/R image positions and rotation error. - Post the image to Twitter/Facebook. - Image crop. - Support Flucard. - etc
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.
Screenshots
Verdict
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 6 months). On ads, in-app purchases, device support and iOS requirement 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
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 6 months. The most recent releases landed on September 25, 2026 and September 10, 2026 respectively.
| Parameter | i3DSteroid | HDRI Prep |
|---|---|---|
| Price | $2.99 — better | $9.99 |
| Rating | 4.4 (38 ratings) — better | — |
| Positive reviews | 75.8% of reviews | — |
| Number of ratings | 38 — better | — |
| Update frequency | Every 3 weeks — better | Every 6 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 14.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 6 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Spmaker | Squirrel FX LLC |
In-app purchases
i3DSteroid
No in-app purchases
HDRI Prep
No in-app purchases









