Comparison

Fluids & Particle Simulation vs RYUKIN

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

Head to head
About

Fluids & Particle Simulation

Create mesmerizing, psychedelic fluid art with your fingertips. This app offers a calming and creative outlet to reduce stress and channel negative emotions into beautiful, flowing patterns. Enjoy a unique ASMR experience with sound-reactive visuals and customizable parameters.

Highlights
  • Interactive fluid art simulation
  • Sound-reactive fluids
  • Dozens of customizable parameters
  • Autopilot mode
  • Gyrosensor and haptic feedback integration
  • Real-time sound synthesis
  • Video recording and screenshot functionality
Read full description

Are you stressed and agitated? Do you want to channel your negative energies into something soulful and creatively free till you feel calm? The Fluids and Sounds app can help you - create satisfying, trippy and psychedelic art with your fingertips. This app helps you to reduce stress and calm down. Now you can touch on your screen to simulate colorful and luminescent fluids that flow with your touch movements. Create extraordinary patterns with single touch or multiple touches on the screen and delve deeper into a world of creative fascination and magical freedom till you feel the connection to our universe. --- Features of Fluids and Sounds --- - Wonderful and easy fluid art simulation - Sound reactive fluids (synchronize to your favorite music) - Dozens of parameters to play around with (color, bloom, sunrays, resolution, force and more) - Autopilot included. Let the fluids flow without interacting with the app. You also could stream this to a bigger screen using AirPlay. Please note: Autopilot is not generating sounds. - Gyrosensor, haptic feedback and force touch are integrated (if you want to use them) - Realtime sound synthesis for meditating music - Take screenshots and share them with anyone you like - Record videos of your fluids (please note: Videos are not including the fluid sounds, only the background music, also video recording excludes the UI, so you'll only record what matters - your art) - Save and load your favorite settings using presets --- Feel Free, Calm and Relaxed --- Art is a form of expression and expression helps in catharsis of inexplicable things we feel every day. If you think you suck at art or expression, this app offers you a safe, easy and creative outlet to channel your thoughts into wonderful art impressions that disappear intermittently. Allow yourself to come down and play around with Fluids & Shapes for some minutes to make beautiful expressions on your device’s screen. --- Seek Awareness and Peace --- You feel like the world is too overwhelming and you need to get a bit of awareness? Protect your peace from getting drowned in a pool of negative emotions such as stress, anxiety, agitation, depression etc. Seek awareness and peace the minute you open this app and make the most of your free time with this free, amazing app. --- Create Wonderful Fluid Art Impressions --- Use your fingertips to create wonderful forms and shapes on your device. While you do so, you can listen to relaxing music which is generated in realtime, depending on your input. Get in tune with the relaxing art and music as you make beautiful patterns on your screen. Customize the intensity, color dispersion, vortex index, music effects, waves and other items from the menu to enjoy a more personalized fluid art meditation and relaxation. Are you ready to feel the satisfaction of creative freedom and its impact on your mental wellbeing? The new fluid art meditation and stimulation app is here for you. Enjoy breathtaking art patterns and soulful music till you feel calm and relaxed. Download and use Fluids and Sounds today! Hope you'll enjoy, because we believe you deserve to feel calm and relaxed! Do you have ideas for new features or improvements? You are not satisfied with this app? Feel free to send me a message at info@mkgames.org Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

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

Fluids & Particle Simulation4 screens
RYUKIN4 screens

Verdict

The call

The clearest difference is price: Fluids & Particle Simulation at Free against RYUKIN's $3.49. Fluids & Particle Simulation also leads on ratings volume (770 vs 62) and device support (4 vs 2). RYUKIN's advantage is update cadence (weekly vs monthly). On rating, review sentiment, ads and in-app purchases 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

Fluids & Particle Simulation is free to download; RYUKIN costs $3.49 up front. Fluids & Particle Simulation sells 8 in-app purchases, starting at $2.99 per 7 days and RYUKIN sells 35 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

RYUKIN holds the better App Store score, 4.9 against 4.7. That said, the two scores are not equally well evidenced: Fluids & Particle Simulation has 770 ratings behind it against 62, so its average is the more settled of the two. Written reviews point the same way: 90% of Fluids & Particle Simulation's written reviews are positive against 94% of RYUKIN's.

UpkeepUpdate frequency

Fluids & Particle Simulation ships an update monthly, RYUKIN weekly. The most recent releases landed on October 15, 2026 and October 18, 2026 respectively.

Scorecard5 real differences · 5 level
Fluids & Particle Simulation versus RYUKIN: the parameters behind the verdict, then further details
ParameterFluids & Particle SimulationRYUKIN
PriceFree — better$3.49
Rating4.7 (770 ratings)4.9 (62 ratings) — better
Positive reviews89.6% of reviews94.0% of reviews — better
Number of ratings770 — better62
Update frequencyMonthlyWeekly — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad
Requires iOS13.0 — better16.0
Further details — not scored
Size189 MB227 MB
Age rating4+4+
DeveloperZipoAppsMasataka Hakozaki

Customer experience

Fluids & Particle Simulation

All ratings770 ratings
Positive94.2%
Neutral2.9%
Negative3.0%
Written reviews125 reviews
Positive89.6%
Neutral4.0%
Negative6.4%

RYUKIN

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

User reviews

Fluids & Particle Simulation

From 770 App Store ratings

What we love

  • 🚀 Mesmerizing visuals
  • 👍 Relaxing and calming experience
  • 🎨 Customizable color and fluid effects
  • 🎶 Enjoyable audio/music integration
  • 💡 Innovative and creative app concept

Room to improve

  • 🐛 Occasional crashes or bugs
  • 🔋 Device overheating issues
  • 💰 Paid features may be too expensive
  • 🔇 Lack of volume/audio control options

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

Fluids & Particle Simulation

Reported bugs

2 issues
  • Microphone input not working as expected
  • Difficulty resetting or restoring default settings

Requested features

4 requests
  • Ability to sync visuals with external audio/music
  • More preset options and visual effects
  • Improved UI/UX for settings and controls
  • Support for casting to external displays

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

8 purchases

Fluids & Particle Simulation

Subscriptions3
  • Unlock all features3 Days trial$2.997 Days
  • Unlock all | monthly premium$5.991 Month
  • Fluids PRO$17.991 Year
One-time5
  • Unlock all Presets (iOS)$1.99
  • Unlock all Presets (OS X Mac)$2.99
  • Unlock all features$14.99
Show 2 more
  • Psychedelic magic (OS X Mac)$24.99
  • Psychedelic magic (iOS)$44.99
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 Fluids & Particle Simulation free?
Fluids & Particle Simulation is free to download, with in-app purchases available.
Is RYUKIN free?
RYUKIN costs $3.49, and also offers in-app purchases.
Which has better reviews, Fluids & Particle Simulation or RYUKIN?
RYUKIN is rated higher. Fluids & Particle Simulation averages 4.7 out of 5 from 770 ratings, while RYUKIN averages 4.9 from 62 ratings.
Do Fluids & Particle Simulation or RYUKIN have ads?
Neither Fluids & Particle Simulation nor RYUKIN shows ads.
Which is updated more often, Fluids & Particle Simulation or RYUKIN?
Fluids & Particle Simulation ships an update monthly, and RYUKIN weekly. Most recently, Fluids & Particle Simulation was updated on October 15, 2026 and RYUKIN on October 18, 2026.

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