# Koi vs Coelacanth and ancient fish

The clearest difference is rating: Koi at 4.3 against Coelacanth and ancient fish's 3.7. Koi also leads on ratings volume (36 vs 7). Coelacanth and ancient fish's advantage is update cadence (every 5 weeks vs every 20 months) and review sentiment (50% vs 33%). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Koi holds the better App Store score, 4.3 against 3.7. That said, the two scores are not equally well evidenced: Koi has 36 ratings behind it against 7, so its average is the more settled of the two. Written reviews complicate that: 33% of Koi's written reviews are positive against 50% of Coelacanth and ancient fish's, so the app with the better star average is not the one people write more warmly about.

Koi ships an update every 20 months, Coelacanth and ancient fish every 5 weeks. Both last shipped on November 3, 2026.

## The numbers

| Metric | Koi | Coelacanth and ancient fish |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (36 ratings)](https://appshunter.io/ios/app/koi-aquarium/id1558420605/reviews)** | [3.7 (7 ratings)](https://appshunter.io/ios/app/coelacanth-and-ancient-fish/id1574487489/reviews) |
| Number of ratings | **36** | 7 |
| Positive reviews | 33.3% of reviews | **50.0% of reviews** |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 20 months | **Every 5 weeks** |
| Monetization | Ad-supported | Ad-supported |
| Size | 126 MB | 108 MB |
| Requires iOS | 12.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [HAREPPO](https://appshunter.io/developer/604325074) | [Yamabus](https://appshunter.io/developer/923714578) |

## What reviewers say

### Koi

[App page](https://appshunter.io/ios/app/koi-aquarium/id1558420605)

Observe and interact with beautiful koi and goldfish in a virtual aquarium. Increase their favorability, collect more fish, and unlock new views. Enjoy a relaxing experience with optional in-game currency for faster progression.

**Highlights:** Observe koi and goldfish, Change viewing angles, Increase fish favorability, Purchase fish with in-game currency, Earn currency via mini-games and ads

**Features:** Vision Pro support

**In-app purchases:** none


### Coelacanth and ancient fish

[App page](https://appshunter.io/ios/app/coelacanth-and-ancient-fish/id1574487489)

Customize coelacanth colors and feed them to earn points. Excavate fossils for bonuses and purchase new backgrounds and creatures. Experience AR to bring the ancient world into your room.

**Highlights:** Color customization for coelacanth, Dynamic predation for points, Fossil excavation with bonus multipliers, Purchase background images and creatures, AR function for recreating ancient worlds

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Koi free?

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

### Is Coelacanth and ancient fish free?

Coelacanth and ancient fish is free to download, with no in-app purchases.

### Which has better reviews, Koi or Coelacanth and ancient fish?

Koi is rated higher. Koi averages 4.3 out of 5 from 36 ratings, while Coelacanth and ancient fish averages 3.7 from 7 ratings.

### Do Koi or Coelacanth and ancient fish have ads?

Both Koi and Coelacanth and ancient fish show ads.

### Which is updated more often, Koi or Coelacanth and ancient fish?

Koi ships an update every 20 months, and Coelacanth and ancient fish every 5 weeks. Most recently, Koi was updated on November 3, 2026 and Coelacanth and ancient fish on November 3, 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.*