# KaleidoscopeClock vs RYUKIN

The clearest difference is in-app purchases: KaleidoscopeClock at none against RYUKIN's 38. KaleidoscopeClock also leads on price ($0.99 vs $3.49) and iOS requirement (13.0 vs 16.0). RYUKIN's advantage is update cadence (weekly vs every 10 months) and chart position (#141 vs unranked). On ads and device support there is nothing between them.

KaleidoscopeClock costs $0.99 and RYUKIN $3.49 up front. RYUKIN sells 35 one-off in-app purchases. KaleidoscopeClock asks for nothing beyond the download.

KaleidoscopeClock ships an update every 10 months, RYUKIN weekly. The most recent releases landed on October 7, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | KaleidoscopeClock | RYUKIN |
| --- | --- | --- |
| Price | **$0.99** | $3.49 |
| Rating | — | **[4.9 (62 ratings)](https://appshunter.io/ios/app/ryukin/id6471839445/reviews)** |
| Number of ratings | — | **62** |
| Positive reviews | — | 94.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 10 months | **Weekly** |
| Monetization | — | Free with in-app purchases |
| Best chart rank | — | **#141** |
| Size | 18 MB | 227 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Yoshiaki Onishi](https://appshunter.io/developer/852893746) | [Masataka Hakozaki](https://appshunter.io/developer/323346554) |

## What reviewers say

### KaleidoscopeClock

[App page](https://appshunter.io/ios/app/kaleidoscopeclock/id893468766)

**Features:** macOS Compatibility

**In-app purchases:** none


### RYUKIN

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

**Currently charting:** #141 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 KaleidoscopeClock free?

KaleidoscopeClock costs $0.99, with no in-app purchases.

### Is RYUKIN free?

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

### Do KaleidoscopeClock or RYUKIN have ads?

Neither KaleidoscopeClock nor RYUKIN shows ads.

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

KaleidoscopeClock ships an update every 10 months, and RYUKIN weekly. Most recently, KaleidoscopeClock was updated on October 7, 2026 and RYUKIN on October 25, 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.*