RYUKIN

Masataka Hakozaki

In-app purchases

About this app

～ Gracefully Fluttering Goldfish ～
Goldfish glide gracefully through crystal-clear water, their fins fluttering gently as they swim. Their charming gestures and soft, delicate fin movements have been carefully recreated. Enjoy the beauty of goldfish anytime, anywhere — without the need for water changes or feeding.


App Highlights
- Fish respond to your touch and follow your finger
- Customize tank shape, background color, and floating objects
- Soothing water sounds and clear, refreshing visuals
- "Cat & Baby Mode" for safe play with kittens and toddlers
- Sleep timer for relaxing bedtime use
- Play your favorite music while watching the aquarium
- Clock and date display
- White and black goldfish included; colorful and themed fish available via in-app purchase


Settings & Customization
- Camera options (Free position / Follow fish / Auto-rotation)
- Screen orientation
- Tilt sensitivity
- Sleep timer
- UI size
- Toggle water surface, bubbles, and other effects
- Adjust brightness, saturation, contrast, and color tone
- Quality settings (resolution and various effects)
- Volume settings (water sounds, bubble sounds)
- Clock & date options (font, position, size)


Other Features
- Fish, objects, and the water surface respond to touch and device tilt
- Fish may whimsically swim toward your finger
- Tap too much and the fish may faint.
- Feed the fish
- Adjust the size of fish and objects
- Display up to six fish at once


‥∴ Bringing the Allure of Goldfish Closer ∴‥
This app was born from a childhood dream of recreating goldfish through programming. Fifteen years after the release of the original app *Wa Kingyo*, countless refinements have been made to capture the graceful and charming nature of these fish. From the gentle movement of their fins to the way they chase and munch on food, experience the beauty and warmth that goldfish bring.


Please note: SamsungDeX (desktop mode) is not officially supported at this time, and behavior in that environment may vary.


News and Support
X: @m_hakozaki
TikTok: @m_hakozaki
Instagram: @masataka.hakozaki

Ratings and reviews

Exactly what I needed~ ♡ I have a hard time focusing at work cause I need something passively "existing" near me to feel productive. Sometimes youtube, D&D, music, this weird aquarium game with creepy creatures. Otherwise, I'd be checking my phone constantly and getting hella distracted. Thank you for the tank dust option. It bothered the he// out of me. I treated myself to a 3.99$ game to justify a hard working week and now I need to budget around buying additional fish 😅 Maybe axolotls. Ty♡

Awesome virtual goldfish. I wanted a virtual goldfish tank to add some zen vibes to my office and this app delivers! The fish are beautiful and move very realistically. I'm really happy with the Ryukin app.

The fish are gorgeous and very pretty. Probably the nicest looking fish I've seen in a game. Relaxing to watch. Super cute. It's a pretty simple experience, think of it as an art toy for you to admire gold fish in various settings. The only downside is that aside from the white and black goldfish. All the other goldfish are IAP. It's a bit sad you'll need to pay extra for an iconic red goldfish.

What’s new

- UI fixes and improvements