# iQuarium vs RYUKIN

The clearest difference is price: iQuarium at Free against RYUKIN's $3.49. iQuarium also leads on ratings volume (240 vs 62) and iOS requirement (8.0 vs 16.0). RYUKIN's advantage is rating (4.9 vs 4.3) and review sentiment (94% vs 61%). On ads, in-app purchases, monetization model and device support there is nothing between them.

iQuarium is free to download; RYUKIN costs $3.49 up front. iQuarium sells 9 one-off in-app purchases and RYUKIN sells 35 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

RYUKIN holds the better App Store score, 4.9 against 4.3. Both are backed by a comparable volume of ratings — 240 and 62 respectively. Written reviews point the same way: 61% of iQuarium's written reviews are positive against 94% of RYUKIN's.

iQuarium ships an update monthly, RYUKIN weekly. The most recent releases landed on October 23, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | iQuarium | RYUKIN |
| --- | --- | --- |
| Price | **Free** | $3.49 |
| Rating | [4.3 (240 ratings)](https://appshunter.io/ios/app/iquarium/id486736110/reviews) | **[4.9 (62 ratings)](https://appshunter.io/ios/app/ryukin/id6471839445/reviews)** |
| Number of ratings | **240** | 62 |
| Positive reviews | 61.2% of reviews | **94.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Weekly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | — | **#136** |
| Size | 123 MB | 227 MB |
| Requires iOS | **8.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Infinite Dreams](https://appshunter.io/developer/306712040) | [Masataka Hakozaki](https://appshunter.io/developer/323346554) |

## What reviewers say

### iQuarium

[App page](https://appshunter.io/ios/app/iquarium/id486736110)

A virtual aquarium app designed for relaxation and stress relief. Watch your fish swim, feed them, and interact with them in a calming environment. Discover new decorations to personalize your tank and develop your fish's unique personality.

**Highlights:** Virtual fish tank simulation, Interactive fish care (feeding, playing), Discover and place decorations, Develop fish personality, Relaxing ambient sounds, Personalizable aquarium space

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

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 5000 Points | $0.99 | one-time |
| 5000 Points + Pirate Theme | $0.99 | one-time |
| 5000 Points + Zombie Theme | $0.99 | one-time |
| Pink Theme | $0.99 | one-time |
| Military Theme | $0.99 | one-time |
| Gangsta Theme | $0.99 | one-time |
| Christmas Theme | $0.99 | one-time |
| Happy New Year Theme | $0.99 | one-time |
| Bundle (4 Themes + 5000 pts) | $2.99 | one-time |

**What reviewers like**

- 🐟 Realistic fish behavior
- 🌱 Relaxing aquarium experience
- 🎨 Beautiful graphics and animations
- 🕰️ Useful clock feature

**What reviewers complain about**

- 🕰️ Slow progression and unlocking of new items
- 🐟 Limited number of fish
- 🛑 Lack of updates and new content
- 💤 Boring after initial novelty wears off

**Reported bugs**

- Compatibility issues with newer iOS versions
- Crashing and performance problems
- Inconsistent point tracking and unlocking

**Requested features**

- Add more fish species and color variations
- Implement fish breeding and baby fish
- Allow for more customization and decoration of the aquarium
- Introduce new interactive elements and mini-games


### RYUKIN

[App page](https://appshunter.io/ios/app/ryukin/id6471839445)

**Currently charting:** #136 Top Paid · Entertainment (US App Store)

Experience the serene beauty of goldfish swimming in a customizable virtual aquarium. Interact with the fish, adjust tank settings, and enjoy soothing visuals and sounds. Perfect for relaxation or a calming presence.

**Highlights:** Interactive goldfish that respond to touch, Customizable tank shape and background, Soothing water sounds and visuals, Cat & Baby Mode for safe interaction, Sleep timer for bedtime use, Play your own music, Clock and date display

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

**In-app purchases (35)**

| Purchase | Price | Billing |
| --- | --- | --- |
| WIREFRAME RAINBOW | $0.99 | one-time |
| ROBO FISH 02 | $1.99 | one-time |
| ROBO FISH 04 | $1.99 | one-time |
| ROBO FISH 06 | $1.99 | one-time |
| GHOST BRIDE | $1.99 | one-time |
| BAT FISH | $1.99 | one-time |
| CALICO ORANGE/WHITE/BLACK | $1.99 | one-time |
| BLACK WHITE KITTY FISH | $1.99 | one-time |
| GHOST TRANSLUCENT | $1.99 | one-time |
| BLACK KITTY FISH | $1.99 | one-time |
| WHITE KITTY FISH | $1.99 | one-time |
| ROBO FISH 03 | $1.99 | one-time |
| GHOST BLACK | $1.99 | one-time |
| ROBO FISH 01 | $1.99 | one-time |
| ORANGE & WHITE KITTY FISH | $1.99 | one-time |
| RED RYUKIN | $1.99 | one-time |
| RED-WHITE RYUKIN | $1.99 | one-time |
| CALICO RED/WHITE/BLACK | $1.99 | one-time |
| ORANGE/WHITE | $1.99 | one-time |
| CALICO RED/GRAY/BLACK | $1.99 | one-time |
| YELLOW GOLD RYUKIN | $1.99 | one-time |
| RED CAP ORANDA | $1.99 | one-time |
| RED/WHITE II | $1.99 | one-time |
| LIONHEAD ORANGE/WHITE/BLACK | $1.99 | one-time |
| GHOST LUMINOUS | $1.99 | one-time |
| BLACK RYUKIN | $1.99 | one-time |
| CALICO KITTY FISH | $1.99 | one-time |
| GRAY WHITE KITTY FISH | $1.99 | one-time |
| WHITE VAMPIRE | $1.99 | one-time |
| BLACK VAMPIRE | $1.99 | one-time |
| BLACK WITCH | $1.99 | one-time |
| WHITE WITCH | $1.99 | one-time |
| ZOMBIE FISH | $1.99 | one-time |
| SKELETON FISH | $1.99 | one-time |
| PANDA TELESCOPE | $1.99 | one-time |

**What reviewers like**

- 💎 Gorgeous and lifelike fish
- 🎨 Beautiful and customizable environments
- 🎶 Soothing water sounds
- 🕰️ Useful clock feature
- 👍 Immersive and relaxing experience

**What reviewers complain about**

- 🔋 High battery consumption on max settings
- 💰 Additional fish require paid purchases
- 🌱 Lack of plant/natural decor options
- 🐟 Limited variety of standard goldfish

**Reported bugs**

- Occasional crashing on high-end devices

**Requested features**

- Ability to change fish colors
- Add more fish species (e.g. bettas, tetras)
- Implement fish breeding/growth mode
- Allow customizing fish placement in tank
- Add desktop/widget mode for always-on display


## Frequently asked questions

### Is iQuarium free?

iQuarium is free to download, with in-app purchases available.

### Is RYUKIN free?

RYUKIN costs $3.49, and also offers in-app purchases.

### Which has better reviews, iQuarium or RYUKIN?

RYUKIN is rated higher. iQuarium averages 4.3 out of 5 from 240 ratings, while RYUKIN averages 4.9 from 62 ratings.

### Do iQuarium or RYUKIN have ads?

Neither iQuarium nor RYUKIN shows ads.

### Which is updated more often, iQuarium or RYUKIN?

iQuarium ships an update monthly, and RYUKIN weekly. Most recently, iQuarium was updated on October 23, 2026 and RYUKIN on October 27, 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.*