Comparison

Zen Koi 2 vs EcoBuilder

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

Head to head
About

Zen Koi 2

Nurture and breed vibrant koi, guiding them through a serene journey to transform into majestic dragons. Customize your underwater sanctuary and create unique constellations in a breathtaking celestial realm.

Highlights
  • Breed and nurture koi
  • Transform koi into dragons
  • Explore the Dragon Realm
  • Craft and share constellations
  • Customize personal aquarium
  • Compete on leaderboards
Features
Read full description

Dive into Tranquility: Unwind and Ascend with Zen Koi 2 (Free-to-Play) Embark on a captivating journey of serenity and wonder with Zen Koi 2, the enchanting sequel to the beloved Zen Koi game. Immerse yourself in the soothing flow of the Koi's motion. Tranquil gameplay and calming music complete the serene experience. Breed and nurture vibrant koi and witness their transformation into majestic dragons, all within the comfort of your mobile device. A Legacy of Relaxation Evolves: Zen Koi 2 builds upon the core gameplay that captivated players in the original, offering a soothing and relaxing experience suitable for all ages. While retaining the essence of the classic collection mechanic, Zen Koi 2 introduces exciting new features that enrich your gameplay journey: Ascend to the Dragon Realm: Witness the culmination of your carp's journey as they transcend the koi pond and ascend to a celestial plane. Explore the vast expanse of the Dragon Realm, a breathtaking astral space adorned with shimmering constellations. Unleash Your Creativity: Gather essence as your dragon soars through the Dragon Realm. Use this essence to craft unique and shareable constellations, expressing your artistic vision and leaving your mark on the celestial canvas. Cultivate Your Personal Aquarium: Descend from the ethereal heights and return to your cherished koi pond. In 'My Pond', you can create a personalized underwater zen garden. Decorations range from plants and rocks, to seasonal effects, sand ripples, flowers, and glowing stones. Arrange and customize your underwater haven to reflect your individual style and preferences. Witness the Beauty of Transformation: As you breed and nurture your koi through their lifecycle, marvel at their stunning visual transformations. Observe the vibrant patterns and colors displayed by your koi, culminating in the awe-inspiring metamorphosis into majestic dragons. Connect with Family and Friends: Share your love for Zen Koi 2 with loved ones. Compete in friendly leaderboards, showcasing your koi fish collection and dragon constellations with your family and friends. Beyond Relaxation: A Journey of Discovery and Expression: Zen Koi 2 transcends the boundaries of a mere relaxation tool by offering players a platform for creativity and self-expression. The ability to craft and share constellations in the Dragon Realm allows players to explore their artistic side, while the customizable My Pond fosters a sense of ownership and individuality. Additionally, the family-friendly nature of the game encourages social engagement and fosters a sense of community among players of all ages. Unveiling the Art of Zen Koi 2: The developers at LandShark Games have poured their passion and dedication into crafting a visually captivating and emotionally engaging experience with Zen Koi 2. The game's breathtaking visuals transport players to a world of serenity, while the calming soundtrack soothes the mind and promotes relaxation. More than just a game, Zen Koi 2 offers a refuge from the daily grind, a space to unwind, connect with yourself, and unleash your inner artist. Whether you seek a moment of peace amidst a busy schedule, a creative outlet to express yourself, or a fun and engaging experience to share with friends and family, Zen Koi 2 welcomes you to embark on a journey of tranquility and discovery. Download Zen Koi 2 today and begin your ascent! 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).

About

EcoBuilder

Build and manage your own virtual ecosystem, learning about ecological principles through realistic simulations. Your gameplay can contribute to real scientific research by helping scientists understand complex environmental systems.

Highlights
  • Build virtual ecosystems
  • Realistic ecological simulations
  • Learn ecological phenomena
  • Contribute to scientific research
  • High score tracking
Features
Read full description

EcoBuilder is a game where you will build your own ecosystem of plants and animals, modelled using the same simulations that researchers use to study real ecosystems. You will learn about various ecological phenomena along the way, and if you get really good at playing then your high scores will help real researchers to understand ecosystems better! EcoBuilder is being developed by a team at Imperial College.

Screenshots

Zen Koi 24 screens
EcoBuilder3 screens

Verdict

The call

The clearest difference is rating: Zen Koi 2 at 4.8 against EcoBuilder's 4.0. Zen Koi 2 also leads on ratings volume (30K vs 4). EcoBuilder's advantage is in-app purchases (none vs 63) and ads (none vs shown). On price, update cadence 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

Both are free to download. Zen Koi 2 sells 63 one-off in-app purchases. EcoBuilder asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Zen Koi 2 holds the better App Store score, 4.8 against 4.0. That said, the two scores are not equally well evidenced: Zen Koi 2 has 30K ratings behind it against 4, so its average is the more settled of the two. Written reviews complicate that: 71% of Zen Koi 2's written reviews are positive against 100% of EcoBuilder's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Zen Koi 2 ships an update monthly, EcoBuilder every 3 weeks. The most recent releases landed on October 20, 2026 and October 17, 2026 respectively.

Scorecard7 real differences · 3 level
Zen Koi 2 versus EcoBuilder: the parameters behind the verdict, then further details
ParameterZen Koi 2EcoBuilder
PriceFreeFree
Rating4.8 (30K ratings) — better4.0 (4 ratings)
Positive reviews71.4% of reviews100.0% of reviews — better
Number of ratings30K — better4
Update frequencyMonthlyEvery 3 weeks — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.012.0 — better
Further details — not scored
Size153 MB68 MB
Age rating4+9+
DeveloperLandShark Games Pte. Ltd.Jonathan Zheng

Customer experience

Zen Koi 2

All ratings29,643 ratings
Positive94.9%
Neutral3.4%
Negative1.8%
Written reviews919 reviews
Positive71.4%
Neutral8.1%
Negative20.6%

EcoBuilder

All ratings4 ratings
Positive75.0%
Neutral0.0%
Negative25.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

Zen Koi 2

Reported bugs

2 issues
  • Saved progress being lost or not loading properly
  • Glitches with dragon appearances

Requested features

5 requests
  • Offline play mode
  • More variety in pond environments and prey
  • Ability to interact with and customize dragons
  • Easier way to complete collections
  • Improved friend integration and trading

EcoBuilder

Not enough reviews yet to summarise bugs or requests.

In-app purchases

63 purchases

Zen Koi 2

One-time63
  • Small handful of Pearls$1.99
  • Starter Pack$1.99
  • Value Pack$1.99
Show 60 more
  • Offer Pack$1.99
  • Fun Pack$3.99
  • Suiryū Pack$3.99
  • Senkou Pack$3.99
  • Shodo Pack$3.99
  • Zashi Pack$3.99
  • Hageshī Pack$3.99
  • Ryūtai Pack$3.99
  • Seiun Pack$3.99
  • Saibā Pack$3.99
  • Handful of Pearls$4.99
  • Nice Pack$8.99
  • Hanrin Pack$8.99
  • Bag of Pearls$9.99
  • Tsuru Pack$9.99
  • Saishō Pack$9.99
  • Minori Pack$9.99
  • Tsurai Pack$9.99
  • Origami Pack$9.99
  • Boronoi Pack$9.99
  • Cheshā Pack$9.99
  • Meiro Pack$9.99
  • Kurōjū Pack$9.99
  • Konoha Pack$9.99
  • Sanbīmu Pack$9.99
  • Burokku Pack$9.99
  • Wagasa Pack$9.99
  • Torippī Pack$9.99
  • Nitto Pack$9.99
  • Showa Pack$9.99
  • Sakyū Pack$9.99
  • Enaga Pack$9.99
  • Daimon Pack$9.99
  • Akinoha Pack$9.99
  • Robotto Pack$9.99
  • Kumo Pack$9.99
  • Guradē Pack$9.99
  • Azarashi Pack$9.99
  • Reinī Pack$9.99
  • Māburu Pack$9.99
  • Berī Pack$9.99
  • Byōga Pack$9.99
  • Baabaa Pack$9.99
  • Itoo Pack$9.99
  • Taiju Pack$18.99
  • Seiryu Pack$19.99
  • Ireke Pack$19.99
  • Dōnatsu Pack$19.99
  • Uranai Pack$19.99
  • Kagami Pack$19.99
  • Kaō Pack$19.99
  • Norudiku Pack$19.99
  • Karasu Pack$19.99
  • Shojo Pack$19.99
  • Mikkusu Pack$19.99
  • Inko Pack$19.99
  • Habu Pack$19.99
  • Ōrora Pack$19.99
  • Hareta Pack$19.99
  • Huge chest of Pearls$99.99
None

EcoBuilder

No in-app purchases

Questions

Is Zen Koi 2 free?
Zen Koi 2 is free to download, with in-app purchases available.
Is EcoBuilder free?
EcoBuilder is free to download, with no in-app purchases.
Which has better reviews, Zen Koi 2 or EcoBuilder?
Zen Koi 2 is rated higher. Zen Koi 2 averages 4.8 out of 5 from 30K ratings, while EcoBuilder averages 4.0 from 4 ratings.
Do Zen Koi 2 or EcoBuilder have ads?
Zen Koi 2 shows ads; EcoBuilder does not.
Which is updated more often, Zen Koi 2 or EcoBuilder?
Zen Koi 2 ships an update monthly, and EcoBuilder every 3 weeks. Most recently, Zen Koi 2 was updated on October 20, 2026 and EcoBuilder on October 17, 2026.

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