# Zen Koi 2 vs EcoBuilder

The clearest difference is rating: Zen Koi 2 at 4.8 against EcoBuilder's 4.0. Zen Koi 2 also leads on ratings volume (30K vs 4). EcoBuilder's advantage is in-app purchases (none vs 63) and ads (none vs shown). On price, update cadence and device support there is nothing between them.

Both are free to download. Zen Koi 2 sells 63 one-off in-app purchases. EcoBuilder asks for nothing beyond the download.

Zen Koi 2 holds the better App Store score, 4.8 against 4.0. That said, the two scores are not equally well evidenced: Zen Koi 2 has 30K ratings behind it against 4, so its average is the more settled of the two.

Zen Koi 2 ships an update monthly, EcoBuilder every 3 weeks. The most recent releases landed on October 20, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Zen Koi 2 | EcoBuilder |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (30K ratings)](https://appshunter.io/ios/app/zen-koi-2/id1280254438/reviews)** | [4.0 (4 ratings)](https://appshunter.io/ios/app/ecobuilder/id1512806460/reviews) |
| Number of ratings | **30K** | 4 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 153 MB | 68 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 9+ |
| Developer | [LandShark Games Pte. Ltd.](https://appshunter.io/developer/635142101) | [Jonathan Zheng](https://appshunter.io/developer/1511225031) |

## What reviewers say

### Zen Koi 2

[App page](https://appshunter.io/ios/app/zen-koi-2/id1280254438)

Nurture and breed vibrant koi, guiding them through a serene journey to transform into majestic dragons. Customize your underwater sanctuary and create unique constellations in a breathtaking celestial realm.

**Highlights:** Breed and nurture koi, Transform koi into dragons, Explore the Dragon Realm, Craft and share constellations, Customize personal aquarium, Compete on leaderboards

**Features:** Vision Pro support

**In-app purchases (63)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small handful of Pearls | $1.99 | one-time |
| Starter Pack | $1.99 | one-time |
| Value Pack | $1.99 | one-time |
| Offer Pack | $1.99 | one-time |
| Fun Pack | $3.99 | one-time |
| Suiryū Pack | $3.99 | one-time |
| Senkou Pack | $3.99 | one-time |
| Shodo Pack | $3.99 | one-time |
| Zashi Pack | $3.99 | one-time |
| Hageshī Pack | $3.99 | one-time |
| Ryūtai Pack | $3.99 | one-time |
| Seiun Pack | $3.99 | one-time |
| Saibā Pack | $3.99 | one-time |
| Handful of Pearls | $4.99 | one-time |
| Nice Pack | $8.99 | one-time |
| Hanrin Pack | $8.99 | one-time |
| Bag of Pearls | $9.99 | one-time |
| Tsuru Pack | $9.99 | one-time |
| Saishō Pack | $9.99 | one-time |
| Minori Pack | $9.99 | one-time |
| Tsurai Pack | $9.99 | one-time |
| Origami Pack | $9.99 | one-time |
| Boronoi Pack | $9.99 | one-time |
| Cheshā Pack | $9.99 | one-time |
| Meiro Pack | $9.99 | one-time |
| Kurōjū Pack | $9.99 | one-time |
| Konoha Pack | $9.99 | one-time |
| Sanbīmu Pack | $9.99 | one-time |
| Burokku Pack | $9.99 | one-time |
| Wagasa Pack | $9.99 | one-time |
| Torippī Pack | $9.99 | one-time |
| Nitto Pack | $9.99 | one-time |
| Showa Pack | $9.99 | one-time |
| Sakyū Pack | $9.99 | one-time |
| Enaga Pack | $9.99 | one-time |
| Daimon Pack | $9.99 | one-time |
| Akinoha Pack | $9.99 | one-time |
| Robotto Pack | $9.99 | one-time |
| Kumo Pack | $9.99 | one-time |
| Guradē Pack | $9.99 | one-time |
| Azarashi Pack | $9.99 | one-time |
| Reinī Pack | $9.99 | one-time |
| Māburu Pack | $9.99 | one-time |
| Berī Pack | $9.99 | one-time |
| Byōga Pack | $9.99 | one-time |
| Baabaa Pack | $9.99 | one-time |
| Itoo Pack | $9.99 | one-time |
| Taiju Pack | $18.99 | one-time |
| Seiryu Pack | $19.99 | one-time |
| Ireke Pack | $19.99 | one-time |
| Dōnatsu Pack | $19.99 | one-time |
| Uranai Pack | $19.99 | one-time |
| Kagami Pack | $19.99 | one-time |
| Kaō Pack | $19.99 | one-time |
| Norudiku Pack | $19.99 | one-time |
| Karasu Pack | $19.99 | one-time |
| Shojo Pack | $19.99 | one-time |
| Mikkusu Pack | $19.99 | one-time |
| Inko Pack | $19.99 | one-time |
| Habu Pack | $19.99 | one-time |
| Ōrora Pack | $19.99 | one-time |
| Hareta Pack | $19.99 | one-time |
| Huge chest of Pearls | $99.99 | one-time |

**What reviewers like**

- 🌊 Relaxing and calming game
- 🐉 Ability to play as dragons
- 🎨 Beautiful graphics and animations
- 🎶 Soothing music
- 🔓 No intrusive ads

**What reviewers complain about**

- 🕰️ Slow progression and high costs for new koi slots
- 🐟 Repetitive prey-catching gameplay
- 🔌 Connectivity issues and loading problems
- 🤖 Unsatisfying dragon gameplay

**Reported bugs**

- Saved progress being lost or not loading properly
- Glitches with dragon appearances

**Requested features**

- Offline play mode
- More variety in pond environments and prey
- Ability to interact with and customize dragons
- Easier way to complete collections
- Improved friend integration and trading


### EcoBuilder

[App page](https://appshunter.io/ios/app/ecobuilder/id1512806460)

Build and manage your own virtual ecosystem, learning about ecological principles through realistic simulations. Your gameplay can contribute to real scientific research by helping scientists understand complex environmental systems.

**Highlights:** Build virtual ecosystems, Realistic ecological simulations, Learn ecological phenomena, Contribute to scientific research, High score tracking

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Zen Koi 2 free?

Zen Koi 2 is free to download, with in-app purchases available.

### Is EcoBuilder free?

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

### Which has better reviews, Zen Koi 2 or EcoBuilder?

Zen Koi 2 is rated higher. Zen Koi 2 averages 4.8 out of 5 from 30K ratings, while EcoBuilder averages 4.0 from 4 ratings.

### Do Zen Koi 2 or EcoBuilder have ads?

Zen Koi 2 shows ads; EcoBuilder does not.

### Which is updated more often, Zen Koi 2 or EcoBuilder?

Zen Koi 2 ships an update monthly, and EcoBuilder every 3 weeks. Most recently, Zen Koi 2 was updated on October 20, 2026 and EcoBuilder on October 17, 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.*