# USRK55 vs Thunderstorm Simulator (w/Ads)

The clearest difference is price: Thunderstorm Simulator (w/Ads) at Free against USRK55's $24.99. Thunderstorm Simulator (w/Ads) also leads on update cadence (every 3 months vs every 11 months) and iOS requirement (13.0.0 vs 16.0). USRK55's advantage is ads (none vs shown) and review sentiment (83% vs 50%). On rating, ratings volume, in-app purchases and device support there is nothing between them.

Thunderstorm Simulator (w/Ads) is free to download; USRK55 costs $24.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.6 for USRK55 against 4.6 for Thunderstorm Simulator (w/Ads). Both are backed by a comparable volume of ratings — 7 and 12 respectively. Written reviews are what separate them: 83% of USRK55's written reviews are positive against 50% of Thunderstorm Simulator (w/Ads)'s.

USRK55 ships an update every 11 months, Thunderstorm Simulator (w/Ads) every 3 months. The most recent releases landed on June 1, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | USRK55 | Thunderstorm Simulator (w/Ads) |
| --- | --- | --- |
| Price | $24.99 | **Free** |
| Rating | [4.6 (7 ratings)](https://appshunter.io/ios/app/usrk55/id1225047720/reviews) | **[4.6 (12 ratings)](https://appshunter.io/ios/app/thunderstorm-simulator-wads/id1482707561/reviews)** |
| Number of ratings | 7 | **12** |
| Positive reviews | **83.3% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 11 months | **Every 3 months** |
| Monetization | Paid | **Ad-supported** |
| Size | 2 MB | 75 MB |
| Requires iOS | 16.0 | **13.0.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [David Seeger](https://appshunter.io/developer/1185367971) | [Scott Dodson](https://appshunter.io/developer/1033778296) |

## What reviewers say

### USRK55

[App page](https://appshunter.io/ios/app/usrk55/id1225047720)

Experience a 30-minute 360-degree video of a Karate demonstration. Explore different angles by swiping, zoom, and pan like a photo. Features slow-motion playback and a search function to find specific katas.

**Highlights:** 360-degree video playback, Interactive angle selection, Zoom and pan functionality, Slow motion playback, Searchable kata demonstrations, Dynamic menu with images

**Features:** macOS Compatibility

**In-app purchases:** none


### Thunderstorm Simulator (w/Ads)

[App page](https://appshunter.io/ios/app/thunderstorm-simulator-wads/id1482707561)

Create a personalized thunderstorm experience to aid relaxation and sleep. Customize rain intensity, thunder frequency, lightning effects, and background sounds. Includes a sleep timer with audio fade-out.

**Highlights:** Customizable thunderstorm types, Adjustable rain and thunder sounds, Toggleable lightning effects, Background ambient sounds, Sleep timer with fade-out, Bluetooth and AirPlay support

**In-app purchases:** none


## Frequently asked questions

### Is USRK55 free?

USRK55 costs $24.99, with no in-app purchases.

### Is Thunderstorm Simulator (w/Ads) free?

Thunderstorm Simulator (w/Ads) is free to download, with no in-app purchases.

### Which has better reviews, USRK55 or Thunderstorm Simulator (w/Ads)?

Thunderstorm Simulator (w/Ads) is rated higher. USRK55 averages 4.6 out of 5 from 7 ratings, while Thunderstorm Simulator (w/Ads) averages 4.6 from 12 ratings.

### Do USRK55 or Thunderstorm Simulator (w/Ads) have ads?

Thunderstorm Simulator (w/Ads) shows ads; USRK55 does not.

### Which is updated more often, USRK55 or Thunderstorm Simulator (w/Ads)?

USRK55 ships an update every 11 months, and Thunderstorm Simulator (w/Ads) every 3 months. Most recently, USRK55 was updated on June 1, 2026 and Thunderstorm Simulator (w/Ads) on September 23, 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.*