# iPartyHeteroptics vs RYUKIN

The clearest difference is in-app purchases: iPartyHeteroptics at none against RYUKIN's 10. iPartyHeteroptics also leads on price ($0.99 vs $3.49) and iOS requirement (13.0 vs 16.0). RYUKIN's advantage is update cadence (every 8 days vs every 60 months). On review sentiment, ads, monetization model and device support there is nothing between them.

iPartyHeteroptics costs $0.99 and RYUKIN $3.49 up front. RYUKIN sells 10 one-off in-app purchases. iPartyHeteroptics asks for nothing beyond the download.

iPartyHeteroptics ships an update every 60 months, RYUKIN every 8 days. The most recent releases landed on November 1, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | iPartyHeteroptics | 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 | **100.0% of reviews** | 94.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 60 months | **Every 8 days** |
| Monetization | Paid | Paid |
| Size | 214 MB | 229 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Amenity Design&Planning ,Ltd.](https://appshunter.io/developer/362341189) | [Masataka Hakozaki](https://appshunter.io/developer/323346554) |

## What reviewers say

### iPartyHeteroptics

[App page](https://appshunter.io/ios/app/ipartyheteroptics/id413897363)

Explore ten types of optical illusions by interacting with shapes and patterns. Manipulate lines, squares, and circles to experience visual mysteries and become the life of the party with these engaging illusions.

**Highlights:** Ten types of optical illusions, Interactive shape manipulation, Visual mystery experiences, Party entertainment content, Engaging pattern distortion, Size and color perception illusions

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

**In-app purchases:** none


### RYUKIN

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

Experience the serene beauty of a virtual goldfish aquarium. Customize your tank, interact with the fish, and enjoy soothing sounds. Features a special mode for young children and a sleep timer for relaxation.

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

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ROBO FISH 02 | $1.99 | one-time |
| GHOST TRANSLUCENT | $1.99 | one-time |
| GHOST BLACK | $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 |
| YELLOW GOLD RYUKIN | $1.99 | one-time |
| CALICO KITTY 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 iPartyHeteroptics free?

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

### Is RYUKIN free?

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

### Do iPartyHeteroptics or RYUKIN have ads?

Neither iPartyHeteroptics nor RYUKIN shows ads.

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

iPartyHeteroptics ships an update every 60 months, and RYUKIN every 8 days. Most recently, iPartyHeteroptics was updated on November 1, 2026 and RYUKIN on November 4, 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.*