# Pond Koi vs Roo's Lights

The clearest difference is review sentiment: Roo's Lights at 100% against Pond Koi's 31%. Roo's Lights also leads on price (Free vs $2.99) and rating (5.0 vs 3.1). Pond Koi's advantage is update cadence (every 2 months vs every 6 months) and ratings volume (16 vs 1). On ads and in-app purchases there is nothing between them.

Roo's Lights is free to download; Pond Koi costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Roo's Lights holds the better App Store score, 5.0 against 3.1. That said, the two scores are not equally well evidenced: Pond Koi has 16 ratings behind it against 1, 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 Roo's Lights's.

Pond Koi ships an update every 2 months, Roo's Lights every 6 months. The most recent releases landed on October 8, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Pond Koi | Roo's Lights |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | [3.1 (16 ratings)](https://appshunter.io/ios/app/pond-koi/id642875147/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/roos-lights/id1003055941/reviews)** |
| Number of ratings | **16** | 1 |
| Positive reviews | 30.8% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 6 months |
| Monetization | Paid | **Free** |
| Size | 228 MB | 13 MB |
| Requires iOS | 12.0 | **8.0** |
| Devices | **iPhone, iPad, iPod, Mac, Apple TV** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [荣辉 张](https://appshunter.io/developer/517582330) | [Sources and Methods](https://appshunter.io/developer/521947757) |

## What reviewers say

### Pond Koi

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

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


### Roo's Lights

[App page](https://appshunter.io/ios/app/roos-lights/id1003055941)

A simple, ad-free interactive toy for babies and toddlers inspired by minimalist children's books. It features four switches that control four lights, offering an engaging experience for little ones.

**Highlights:** Four switches, Four lights, Ad-free experience, Inspired by children's books, Toddler-friendly design

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Pond Koi free?

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

### Is Roo's Lights free?

Roo's Lights is free to download, with no in-app purchases.

### Which has better reviews, Pond Koi or Roo's Lights?

Roo's Lights is rated higher. Pond Koi averages 3.1 out of 5 from 16 ratings, while Roo's Lights averages 5.0 from 1 ratings.

### Do Pond Koi or Roo's Lights have ads?

Neither Pond Koi nor Roo's Lights shows ads.

### Which is updated more often, Pond Koi or Roo's Lights?

Pond Koi ships an update every 2 months, and Roo's Lights every 6 months. Most recently, Pond Koi was updated on October 8, 2026 and Roo's Lights on October 6, 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.*