RYUKIN
RYUKIN Summary
RYUKIN is a with in-app purchases Android app in Entertainment by Masataka Hakozaki. Released in Mar 2024 (2 years ago). It has about 6.4K+ installs and 254 ratings with a 4.82★ (excellent) average. Based on AppGoblin estimates, it reaches roughly 413 monthly active users and generates around $<10K monthly revenue (100% IAP / 0% ads). Store metadata: updated Apr 5, 2026.
Recent activity: 111 installs this week (398 over 4 weeks) showing steady growth , and 3.00 new ratings this week View trends →
Store info: Last updated on Google Play on Apr 5, 2026 .
4.82★
Ratings: 254
Screenshots
App Description
Gracefully Fluttering Goldfish
～ 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