# Koi Feeder vs aqua − バーチャル水族館

The clearest difference is in-app purchases: Koi Feeder at none against aqua − バーチャル水族館's 1. Koi Feeder also leads on iOS requirement (12.0 vs 16.0). aqua − バーチャル水族館's advantage is ads (none vs shown) and update cadence (weekly vs every 19 months). On price and device support there is nothing between them.

Both are free to download. aqua − バーチャル水族館 sells 1 one-off in-app purchase. Koi Feeder asks for nothing beyond the download.

Koi Feeder ships an update every 19 months, aqua − バーチャル水族館 weekly. The most recent releases landed on November 2, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | Koi Feeder | aqua − バーチャル水族館 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/koi-feeder/id1325380896/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 19 months | **Weekly** |
| Monetization | Ad-supported | — |
| Size | 67 MB | 5 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [kume toru](https://appshunter.io/developer/731695033) | [VIRTUALCROSS](https://appshunter.io/developer/1589687997) |

## What reviewers say

### Koi Feeder

[App page](https://appshunter.io/ios/app/koi-feeder/id1325380896)

Interact with digital koi by feeding them. Enjoy a simple, relaxing experience designed to be played with.

**Highlights:** Feed digital koi, Interact with koi, Relaxing gameplay, Simple interface

**Features:** macOS Compatibility

**In-app purchases:** none


### aqua − バーチャル水族館

[App page](https://appshunter.io/ios/app/aqua/id6819573223)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1回券 | $1.99 | one-time |


## Frequently asked questions

### Is Koi Feeder free?

Koi Feeder is free to download, with no in-app purchases.

### Is aqua − バーチャル水族館 free?

aqua − バーチャル水族館 is free to download, with in-app purchases available.

### Do Koi Feeder or aqua − バーチャル水族館 have ads?

Koi Feeder shows ads; aqua − バーチャル水族館 does not.

### Which is updated more often, Koi Feeder or aqua − バーチャル水族館?

Koi Feeder ships an update every 19 months, and aqua − バーチャル水族館 weekly. Most recently, Koi Feeder was updated on November 2, 2026 and aqua − バーチャル水族館 on November 10, 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.*