236+ iOS apps & games curated and reviewed
The best koi fish aquarium apps and games on iPhone average 4.4★ across 236+ titles — we've ranked them by what real users actually keep on their phones. Updated August 2026.
| # | App | Price | Rating | Ads | In-App Purchases | Updated |
|---|---|---|---|---|---|---|
| 1 |  | Free | 4.0★ (8) | Yes | No | Aug 2026 |
| 2 |  | Free | 4.2★ (35) | Yes | No | Aug 2026 |
| 3 |  | Free | 4.2★ (14K) | No | Yes | Aug 2026 |
| 4 |  | Free | 4.6★ (6.6K) | Yes | Yes | Aug 2026 |
| 5 |  | Free | 4.6★ (3.5K) | No | Yes | Aug 2026 |
| 6 |  | Free | 4.7★ (6.3K) | Yes | Yes | Aug 2026 |
| 7 |  | Free | — | — | No | Jul 2026 |
| 8 |  | $2.99 | 4.9★ (218) | No | No | Jul 2026 |
Design and maintain your own virtual koi pond. Care for your fish, customize the environment, and enjoy a peaceful, interactive aquarium experience.
Observe and interact with beautiful koi and goldfish in a virtual aquarium. Increase their favorability, collect more fish, and unlock new views. Enjoy a relaxing experience with optional in-game currency for faster progression.
This app helps aquarium owners plan their tanks and avoid common mistakes. It checks fish compatibility and tank stocking levels, offering information on over 1000 fish species. You can save and share your aquarium setups.
Create and manage your own vibrant 3D aquariums filled with a vast array of marine life. Buy, breed, and sell fish to expand your collection, customize your tanks with decorations, and enjoy realistic fish behavior and interactions.
Create and customize your own vibrant underwater world with a vast array of fish, sea creatures, and decorations. Raise and breed exotic fish, discover new species, and connect with a community of fellow aquarium enthusiasts through chat and gifting.
Care for a vibrant ocean reef and collect hundreds of sea creatures. Discover new species, learn facts about marine life, and decorate your sanctuary. Participate in special events and connect with friends to build thriving underwater worlds.
Create and nurture your own virtual koi pond. Customize fish, environments, and watch them grow. This relaxing app offers a serene escape with beautiful graphics and calming sounds.
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.
Create and manage your own virtual aquarium empire. Choose from over 200 exotic 3D fish and sharks, and customize your underwater environments with more than 85 decorations. Buy, breed, and sell fish to earn coins and unlock new content.
Breed and discover unique koi fish in an infinite procedurally generated world. Collect your favorite patterns as trading cards and share them with others. Explore new mutations and fill your koi book.
Design and populate your own virtual fish tanks with a variety of decorations and fish. Earn rewards by caring for your aquatic life and completing daily challenges to expand your underwater world.
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.
Digitally manage your koi population and pond water quality. Track fish growth, calculate optimal feeding amounts, and monitor water parameters with automated analysis and suggestions. View trends with generated charts and manage multiple ponds.
Transform your device into a stunning, dynamic aquarium with high-definition ocean scenes. Enjoy relaxing ambient sounds or play your own music. Features include a sleep timer and flashlight, perfect for background ambiance.
Create and manage your own 3D aquarium, raising fish from babies to adults. Customize your underwater world with vibrant backgrounds and decorations, and interact with friends' aquariums. Buy, sell, and collect a variety of marine life.
Create and manage your own virtual aquarium with realistic 3D fish. Buy, breed, and sell a variety of species, customize your tanks with decorations, and enjoy a lifelike aquatic experience.
Experience a vibrant, interactive 3D aquarium on your device. Watch realistic fish swim, interact with them by touching the screen, and even download new species. Personalize your aquarium with custom backgrounds from your photo library.