Comparison

Flutter vs Zen Koi Classic

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

Head to head
About

Flutter

Create a vibrant rainforest sanctuary by collecting and nurturing hundreds of real butterfly species. Watch them grow through their life cycle, learn fascinating facts, and expand your magical forest with beautiful decorations. Enjoy relaxing gameplay with a calming soundtrack and discover new species through missions and events.

Highlights
  • Collect 400+ real butterfly species
  • Nurture butterflies through their life cycle
  • Expand and decorate your forest sanctuary
  • Engage in missions and limited-time events
  • Relaxing gameplay with peaceful ambiance
Features
Read full description

Watch your rainforest sanctuary come to life as you collect, nurture, and learn about hundreds of real butterfly species. Nurture each species through their incredible life cycle, feeding to help them grow from caterpillar to chrysalis to butterfly. Watch your Flutterpedia come alive with fascinating facts about each butterfly you collect. Behold their stunning wing patterns and playful quirks as they flutter around your rainforest sanctuary. Each butterfly is beautifully illustrated and based on real species from around the world. Discover new species, expand your collection, and create a thriving, magical rainforest. Features * Collect 400+ Butterflies: Discover real species from around the world, each beautifully illustrated with vibrant colors and unique wing patterns. * Nurture Each Species: Feed and grow butterflies through their amazing life cycle, from caterpillar to chrysalis to butterfly. * Expand and Decorate Your Forest: Expand your sanctuary and adorn it with plants and magical décor to help you progress. * Missions and Events: Missions, updates, and limited-time events bring exciting new butterflies, decor, and rewards. There is always something new to discover! * Relaxing Gameplay: Unwind with peaceful rainforest ambiance and a calming soundtrack. Made with love by Runaway, the award-winning studio behind some of the world’s most beloved nature games. Please note: This game is free-to-play but does include in-app purchases. For support or suggestions, contact: support@runaway.zendesk.com.

About

Zen Koi Classic

Nurture and collect vibrant Koi fish in a serene underwater world. Watch them grow, evolve into majestic dragons, and discover hundreds of unique varieties. Share your collection with friends and enjoy a calming, visually stunning experience.

Highlights
  • Breed and collect hundreds of unique Koi varieties
  • Watch Koi evolve into majestic dragons
  • Soothing music and mesmerizing visuals
  • Intuitive single-touch controls
  • Share and gift Koi with friends
  • Limited edition rewards for collectors
Features
Read full description

Looking for a relaxing game? Dive into Tranquility: Unwind and Ascend with Zen Koi Classic (Free-to-Play) Embark on a captivating journey of transformation and serenity in Zen Koi Classic, the enchanting mobile game where you experience the vibrancy and breathtaking beauty of the graceful Koi. Immerse yourself in a calming atmosphere filled with soothing music and mesmerizing visuals as you nurture these magnificent fish, witnessing their growth and culminating metamorphosis into majestic dragons. Unwind and Ascend: A Timeless Tale Zen Koi Classic offers a unique experience that blends relaxation with strategic collection. Breed, collect and discover beautiful Koi: witness the captivating journey of your Koi as they evolve from tiny hatchlings into breathtaking creatures, each boasting unique colors and intricate patterns. Guide them through their life cycle, culminating in a stunning transformation that embodies the legend of the Koi's ascension into a dragon. Features: Free-to-Play: Enjoy the core gameplay experience without any purchase required. Soothing and Intuitive Gameplay: Immerse yourself in a world of tranquility with simple controls and a serene environment. Unique Flowing Action: Guide your Koi with a single touch, mimicking their graceful movements through the water. A Calming Oasis: Find peace in the beautiful aquatic environment, enhanced by soothing music and sound effects. Unveiling a Spectrum of Koi: Discover and collect hundreds of stunning Koi varieties, each boasting unique color combinations and patterns. Some rare specimens await the most dedicated collectors! Share Your Passion: Share and gift magnificent Koi you have bred and collected with friends and fellow players. Limited Edition Reward: Collect and complete all Koi and Dragon collections in Zen Koi Classic and claim unique decorations for your personal pond and aquarium in Zen Koi 2 as a special bonus! Unveiling the Depths of Zen Koi Classic: A Visual Symphony: Immerse yourself in an underwater world teeming with vibrant life with plenty of prey to catch. The Calming Symphony: Escape the daily grind with a serene soundtrack by Kiat from System Sovereign featuring gentle melodies and calming ambient sounds. Soundscapes are designed by IMBA to further enhance the sense of tranquility. The Emotional Connection: Witness the heartwarming growth and transformation of your Koi. Observe their vibrant colors and discover a progression of beautiful patterns, building a special bond with your pond companions. As they evolve into majestic dragons, experience a sense of accomplishment for nurturing them throughout their journey. Download Zen Koi Classic today and embark on a captivating odyssey of transformation and tranquility! Note: Zen Koi is free to download and play. However, optional items are available via In-App Purchase within the game to expand upon your gameplay experience. By downloading this game, you agree to our Terms of Service & Privacy Policy: http://www.landsharkgames.com/terms-of-service/ http://www.landsharkgames.com/privacy-policy/ Rated 3+ by the Indonesia Game Rating System (IGRS).

Screenshots

Flutter4 screens
Zen Koi Classic4 screens

Verdict

The call

The clearest difference is update cadence: Flutter at every 8 days against Zen Koi Classic's every 3 months. Zen Koi Classic's advantage is review sentiment (86% vs 73%). On price, rating, ratings volume and ads 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

Both are free to download. Flutter sells 10 one-off in-app purchases and Zen Koi Classic sells 10 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.7 for Flutter against 4.7 for Zen Koi Classic. Both are backed by a comparable volume of ratings — 4.9K and 2.1K respectively. Written reviews are what separate them: 73% of Flutter's written reviews are positive against 86% of Zen Koi Classic's.

UpkeepUpdate frequency

Flutter ships an update every 8 days, Zen Koi Classic every 3 months. Both last shipped on November 11, 2026.

Scorecard2 real differences · 8 level
Flutter versus Zen Koi Classic: the parameters behind the verdict, then further details
ParameterFlutterZen Koi Classic
PriceFreeFree
Rating4.7 (4.9K ratings) — better4.7 (2.1K ratings)
Positive reviews72.7% of reviews85.6% of reviews — better
Number of ratings4.9K — better2.1K
Update frequencyEvery 8 days — betterEvery 3 months
AdsYesYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.015.0
Further details — not scored
Size539 MB128 MB
Age rating+44+
DeveloperRunawayLandShark Games Pte. Ltd.

Customer experience

Flutter

All ratings4,863 ratings
Positive92.7%
Neutral3.1%
Negative4.1%
Written reviews1,107 reviews
Positive72.7%
Neutral8.1%
Negative19.2%

Zen Koi Classic

All ratings2,057 ratings
Positive93.1%
Neutral3.8%
Negative3.1%
Written reviews383 reviews
Positive85.6%
Neutral7.6%
Negative6.8%

User reviews

Flutter

From 4.9K App Store ratings

What we love

  • 🦋 Beautiful and relaxing game
  • 👍 Informative and educational
  • 🎨 Gorgeous graphics and animations
  • 🎶 Calming music and ambiance

Room to improve

  • 🐛 Frequent crashes and bugs
  • 💰 Expensive in-app purchases and expansions
  • ⏱️ Slow progression and long wait times
  • 🔒 Requires constant internet connection

Zen Koi Classic

From 2.1K App Store ratings

What we love

  • 🌊 Relaxing and calming gameplay
  • 🎨 Beautiful and intricate koi designs
  • 🐉 Enjoyment of breeding and evolving koi into dragons
  • 🕰️ Great way to pass time and de-stress
  • 🎶 Soothing and pleasant background music

Room to improve

  • 💰 Difficulty earning pearls without in-app purchases
  • 🔒 Limited number of koi/egg slots without spending pearls
  • 🐛 Occasional crashes and bugs after updates
  • 🆕 Concerns about losing progress after updates
  • 📺 Disruptive full-screen ads

Bugs and requests

Flutter

Reported bugs

3 issues
  • Game resets progress after updates
  • Inability to access Flutterpedia and achievements
  • Inconsistent performance and freezing issues

Requested features

4 requests
  • Offline mode
  • Ability to sell or remove unwanted butterflies
  • More interactive events and mini-games
  • Expanded forest and storage space

Zen Koi Classic

Reported bugs

3 issues
  • Koi and dragon progress lost after updates
  • Inconsistent koi movement and speed issues
  • Ads causing frequent crashes or freezes

Requested features

5 requests
  • Ability to play as or interact with dragons
  • More koi slots or alternative ways to expand pond
  • Easier ways to earn pearls without watching ads
  • Ability to name or customize koi and dragons
  • Zoom out feature to see full pond layout

In-app purchases

10 purchases

Flutter

One-time10
  • Beetle Bank$0.99
  • 50 Flutterbucks$1.99
  • Amazing Value Pack$1.99
Show 7 more
  • Starter Park 001$2.99
  • Starter Pack B$4.99
  • 130 Flutterbucks$4.99
  • Nectar Booster$4.99
  • Spirit Booster$4.99
  • 275 Flutterbucks$9.99
  • 700 Flutterbucks$24.99
10 purchases

Zen Koi Classic

One-time10
  • Starter Pack$1.99
  • Small Handful of pearls$1.99
  • Handful of pearls$4.99
Show 7 more
  • Hasu Pack$4.99
  • Bag of pearls$9.99
  • Tenshi Pack$9.99
  • Splatto Pack$9.99
  • Yajiri Pack$9.99
  • Monkī Pack$19.99
  • Nami Pack$19.99

Questions

Is Flutter free?
Flutter is free to download, with in-app purchases available.
Is Zen Koi Classic free?
Zen Koi Classic is free to download, with in-app purchases available.
Which has better reviews, Flutter or Zen Koi Classic?
Flutter is rated higher. Flutter averages 4.7 out of 5 from 4.9K ratings, while Zen Koi Classic averages 4.7 from 2.1K ratings.
Do Flutter or Zen Koi Classic have ads?
Both Flutter and Zen Koi Classic show ads.
Which is updated more often, Flutter or Zen Koi Classic?
Flutter ships an update every 8 days, and Zen Koi Classic every 3 months. Most recently, Flutter was updated on November 11, 2026 and Zen Koi Classic on November 11, 2026.

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