Comparison

Atomus vs RYUKIN

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Atomus

This app is an interactive visualizer that creates beautiful, dynamic art inspired by natural phenomena and abstract concepts. It offers customizable particle effects, multi-touch interaction, and music integration, designed to inspire creativity or provide a relaxing visual experience.

Highlights
  • 10-Finger Multi-touch Display
  • 5 Music Choices
  • Fastest Speed (60 FPS)
  • 12,000 Particles
  • Customizable Particle Length, Number, & Size
  • 3-Color Modes
Features
Read full description

ATOMUS — A Living Kinetic Universe in Your Hands Touch energy. Shape motion. Watch light come alive. ATOMUS transforms your screen into a living kinetic universe where thousands of particles react instantly to every movement, creating flowing structures, cosmic patterns, and mesmerizing visual motion that feels both dynamic and calming. Designed for moments when you want to reset your mind, explore visual creativity, or simply watch something beautiful evolve under your fingertips, ATOMUS offers a unique sensory experience between digital art and meditation. Every touch creates shifting forms that can feel like fireworks, auroras, galaxies, waves, atomic structures, or living energy — always moving, always changing. Why users love ATOMUS • Deeply immersive touch interaction • Hypnotic moving particle structures • Ideal for creative focus and visual relaxation • A satisfying sensory experience that never feels the same twice • Beautiful for both quiet moments and playful exploration A Dynamic Visual Experience ATOMUS is inspired by: • fireworks • whirlwinds • fireflies • auroras • rainbows • waves • atomic forms Each interaction creates evolving structures that feel alive and endlessly surprising. Real-Time Performance • Up to 12,000 particles in real time • Smooth 60 FPS rendering • 10-finger multi-touch support • Adjustable particle size, quantity, and trail length • 3 color modes: Neon, Crystal, Nature • Built-in music by Aden Ray (optional) Free Version Enjoy ATOMUS for free. Upgrade to HD for: • 2× more particles • Ad-free experience • Richer visual density Support If you have ideas, questions, or feedback, I would love to hear from you. sunglab@gmail.com http://www.sunglab.com

About

RYUKIN

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
Read full description

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

Screenshots

Atomus4 screens
RYUKIN4 screens

Verdict

The call

The clearest difference is price: Atomus at Free against RYUKIN's $3.49. Atomus also leads on in-app purchases (none vs 38) and ratings volume (525 vs 62). RYUKIN's advantage is ads (none vs shown) and update cadence (weekly vs every 2 months). On rating, review sentiment, monetization model and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Atomus is free to download; RYUKIN costs $3.49 up front. RYUKIN sells 35 one-off in-app purchases. Atomus asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.8 for Atomus against 4.9 for RYUKIN. That said, the two scores are not equally well evidenced: Atomus has 525 ratings behind it against 62, so its average is the more settled of the two. Written reviews are what separate them: 89% of Atomus's written reviews are positive against 94% of RYUKIN's.

UpkeepUpdate frequency

Atomus ships an update every 2 months, RYUKIN weekly. The most recent releases landed on October 16, 2026 and October 14, 2026 respectively.

Scorecard5 real differences · 5 level
Atomus versus RYUKIN: the parameters behind the verdict, then further details
ParameterAtomusRYUKIN
PriceFree — better$3.49
Rating4.8 (525 ratings)4.9 (62 ratings) — better
Positive reviews89.5% of reviews94.0% of reviews — better
Number of ratings525 — better62
Update frequencyEvery 2 monthsWeekly — better
AdsYesNo — better
In-app purchasesNo — betterYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.6 — better16.0
Further details — not scored
Size92 MB227 MB
Age rating4+4+
DeveloperSungLab IncMasataka Hakozaki

Customer experience

Atomus

All ratings525 ratings
Positive93.9%
Neutral2.7%
Negative3.4%
Written reviews152 reviews
Positive89.5%
Neutral4.6%
Negative5.9%

RYUKIN

All ratings62 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews100 reviews
Positive94.0%
Neutral0.0%
Negative6.0%

User reviews

Atomus

From 525 App Store ratings

What we love

  • 👍 Relaxing and calming experience
  • 🚀 Smooth and responsive
  • 💡 Customizable particle effects
  • 🔒 No ads or in-app purchases

Room to improve

  • 🐛 Occasional crashes or performance issues
  • 💡 Limited color and customization options
  • 🔋 Drains battery life quickly

RYUKIN

From 62 App Store ratings

What we love

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

Room to improve

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

Bugs and requests

Atomus

Reported bugs

2 issues
  • Crashes when using more than 10 fingers
  • Inconsistent ad frequency

Requested features

3 requests
  • More color and particle effect options
  • Ability to turn off sound/music
  • Haptic feedback support

RYUKIN

Reported bugs

1 issue
  • Occasional crashing on high-end devices

Requested features

5 requests
  • 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

In-app purchases

None

Atomus

No in-app purchases

35 purchases

RYUKIN

One-time35
  • WIREFRAME RAINBOW$0.99
  • ROBO FISH 02$1.99
  • ROBO FISH 04$1.99
Show 32 more
  • ROBO FISH 06$1.99
  • GHOST BRIDE$1.99
  • BAT FISH$1.99
  • CALICO ORANGE/WHITE/BLACK$1.99
  • BLACK WHITE KITTY FISH$1.99
  • GHOST TRANSLUCENT$1.99
  • BLACK KITTY FISH$1.99
  • WHITE KITTY FISH$1.99
  • ROBO FISH 03$1.99
  • GHOST BLACK$1.99
  • ROBO FISH 01$1.99
  • ORANGE & WHITE KITTY FISH$1.99
  • RED RYUKIN$1.99
  • RED-WHITE RYUKIN$1.99
  • CALICO RED/WHITE/BLACK$1.99
  • ORANGE/WHITE$1.99
  • CALICO RED/GRAY/BLACK$1.99
  • YELLOW GOLD RYUKIN$1.99
  • RED CAP ORANDA$1.99
  • RED/WHITE II$1.99
  • LIONHEAD ORANGE/WHITE/BLACK$1.99
  • GHOST LUMINOUS$1.99
  • BLACK RYUKIN$1.99
  • CALICO KITTY FISH$1.99
  • GRAY WHITE KITTY FISH$1.99
  • WHITE VAMPIRE$1.99
  • BLACK VAMPIRE$1.99
  • BLACK WITCH$1.99
  • WHITE WITCH$1.99
  • ZOMBIE FISH$1.99
  • SKELETON FISH$1.99
  • PANDA TELESCOPE$1.99

Questions

Is Atomus free?
Atomus is free to download, with no in-app purchases.
Is RYUKIN free?
RYUKIN costs $3.49, and also offers in-app purchases.
Which has better reviews, Atomus or RYUKIN?
RYUKIN is rated higher. Atomus averages 4.8 out of 5 from 525 ratings, while RYUKIN averages 4.9 from 62 ratings.
Do Atomus or RYUKIN have ads?
Atomus shows ads; RYUKIN does not.
Which is updated more often, Atomus or RYUKIN?
Atomus ships an update every 2 months, and RYUKIN weekly. Most recently, Atomus was updated on October 16, 2026 and RYUKIN on October 14, 2026.

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