Comparison

Simple HDR vs HDRI Prep

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Simple HDR

Capture bracketed 360° images with this app, designed for Ricoh Theta cameras. Choose between Auto and Pro settings for quick HDR landscape creation or light and reflection map generation.

Highlights
  • Capture bracketed 360° images
  • Create 360° landscapes
  • Generate light maps
  • Generate reflection maps
  • Auto capture setting (3 shots, 5 stops)
  • Pro capture setting (7 shots, 12 stops)
Features
Read full description

NOTE: A Ricoh Theta camera is required to use Simple HDR. We support the Ricoh Theta m15 and Ricoh Theta S models. Simple HDR is the easy way to quickly capture a full set of bracketed 360° images. You can use these images to create beautiful 360° landscapes, or to capture light maps or reflection maps for use in visual effects or video games. Unlike other HDR apps, we remove the complexity from this process and give you just two great options to choose from. We did our research, took hundreds of test images, and found the options that let you get the most out of the Ricoh Theta’s capabilities. Choose our Auto setting to quickly capture three 360° images, covering a range of 5 stops in just 15 seconds. This should be enough light data to capture most indoor or mixed lighting scenes. Or you can choose our Pro setting to take up to 7 shots, covering a range of 12 stops. This setting is ideal for outdoor scenes in bright daylight. When you’re done shooting, you can use Photoshop or your favorite HDR tool to create beautiful landscapes, lighting maps, or reflection maps. Make 360° HDR images quickly and easily with Simple HDR.

About

HDRI Prep

Features
Read full description

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

Simple HDR4 screens
HDRI Prep4 screens

Verdict

The call

The clearest difference is update cadence: Simple HDR at every 2 months against HDRI Prep's every 6 months. Simple HDR also leads on chart position (#192 vs unranked) and iOS requirement (12.0 vs 15.0). On price, ads, in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

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

UpkeepUpdate frequency

Simple HDR ships an update every 2 months, HDRI Prep every 6 months. The most recent releases landed on September 15, 2026 and September 10, 2026 respectively.

Scorecard3 real differences · 8 level
Simple HDR versus HDRI Prep: the parameters behind the verdict, then further details
ParameterSimple HDRHDRI Prep
Price$9.99$9.99
Rating2.7 (7 ratings) — better—
Positive reviews55.6% of reviews—
Number of ratings7 — better—
Update frequencyEvery 2 months — betterEvery 6 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
Best chart rank#192 — better—
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS12.0 — better15.0
Further details — not scored
Size2 MB1 MB
Age rating4+4+
DeveloperBuilt LightSquirrel FX LLC

In-app purchases

None

Simple HDR

No in-app purchases

None

HDRI Prep

No in-app purchases

Questions

Is Simple HDR free?
Simple HDR costs $9.99, with no in-app purchases.
Is HDRI Prep free?
HDRI Prep costs $9.99, with no in-app purchases.
Do Simple HDR or HDRI Prep have ads?
Neither Simple HDR nor HDRI Prep shows ads.
Which is updated more often, Simple HDR or HDRI Prep?
Simple HDR ships an update every 2 months, and HDRI Prep every 6 months. Most recently, Simple HDR was updated on September 15, 2026 and HDRI Prep on September 10, 2026.

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