# Pond Koi vs Thunderstorm Simulator

The clearest difference is review sentiment: Thunderstorm Simulator at 100% against Pond Koi's 31%. Thunderstorm Simulator also leads on rating (4.5 vs 3.1) and price ($1.99 vs $2.99). Pond Koi's advantage is update cadence (every 2 months vs every 4 months) and ratings volume (16 vs 2). On ads, in-app purchases, monetization model and chart position there is nothing between them.

Pond Koi costs $2.99 and Thunderstorm Simulator $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Thunderstorm Simulator holds the better App Store score, 4.5 against 3.1. That said, the two scores are not equally well evidenced: Pond Koi has 16 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 31% of Pond Koi's written reviews are positive against 100% of Thunderstorm Simulator's.

Pond Koi ships an update every 2 months, Thunderstorm Simulator every 4 months. The most recent releases landed on October 8, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Pond Koi | Thunderstorm Simulator |
| --- | --- | --- |
| Price | $2.99 | **$1.99** |
| Rating | [3.1 (16 ratings)](https://appshunter.io/ios/app/pond-koi/id642875147/reviews) | **[4.5 (2 ratings)](https://appshunter.io/ios/app/thunderstorm-simulator/id1200949907/reviews)** |
| Number of ratings | **16** | 2 |
| Positive reviews | 30.8% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 4 months |
| Monetization | Paid | Paid |
| Best chart rank | #198 | **#193** |
| Size | 228 MB | 72 MB |
| Requires iOS | **12.0** | 15.0.0 |
| Devices | **iPhone, iPad, iPod, Mac, Apple TV** | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [荣辉 张](https://appshunter.io/developer/517582330) | [Scott Dodson](https://appshunter.io/developer/1033778296) |

## What reviewers say

### Pond Koi

[App page](https://appshunter.io/ios/app/pond-koi/id642875147)

**Currently charting:** #198 Top Paid · Entertainment (US App Store)

Create a serene digital pond with swimming koi, customizable backgrounds, and natural soundscapes. Interact with the fish, add flowers, and enjoy a stress-relieving visual and auditory experience.

**Highlights:** Realistic koi fish simulation, Customizable pond backgrounds, Interactive fish feeding and teasing, Variety of natural sound effects, Flower and leaf arrangement, Realistic water splashes and ripples

**Features:** Vision Pro support

**In-app purchases:** none


### Thunderstorm Simulator

[App page](https://appshunter.io/ios/app/thunderstorm-simulator/id1200949907)

**Currently charting:** #193 Top Paid · Entertainment (US App Store)

Create a personalized thunderstorm experience with adjustable rain, thunder, and lightning effects. Customize sound volumes, lightning occurrences, and light colors to relax or fall asleep. Includes a sleep timer and options for background nature sounds.

**Highlights:** Adjustable rain sounds and volume, Customizable thunder and lightning occurrences, Screen or camera flash lightning effects, Background nature sounds, Sleep timer with fade-out, Keep Awake mode, Lightning on Demand control

**In-app purchases:** none


## Frequently asked questions

### Is Pond Koi free?

Pond Koi costs $2.99, with no in-app purchases.

### Is Thunderstorm Simulator free?

Thunderstorm Simulator costs $1.99, with no in-app purchases.

### Which has better reviews, Pond Koi or Thunderstorm Simulator?

Thunderstorm Simulator is rated higher. Pond Koi averages 3.1 out of 5 from 16 ratings, while Thunderstorm Simulator averages 4.5 from 2 ratings.

### Do Pond Koi or Thunderstorm Simulator have ads?

Neither Pond Koi nor Thunderstorm Simulator shows ads.

### Which is updated more often, Pond Koi or Thunderstorm Simulator?

Pond Koi ships an update every 2 months, and Thunderstorm Simulator every 4 months. Most recently, Pond Koi was updated on October 8, 2026 and Thunderstorm Simulator on October 13, 2026.

### Which is more popular, Pond Koi or Thunderstorm Simulator?

Pond Koi currently peaks at #198 in the App Store charts, and Thunderstorm Simulator at #193. Chart position reflects recent download velocity rather than total install base.

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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.*