Report updated May 9, 2026

Overview · Full Intel report in progress

Koi - Aquarium is an established games app that is free with in-app purchases. With a 4.2/5 rating from 33 reviews, it shows polarized user reception.

What is Koi - Aquarium?

Koi - Aquarium is a casual simulation game by HAREPPO that allows users to observe carp and goldfish in a virtual environment. The app focuses on a low-stress experience where players can adjust their viewing angles and interact with the fish to increase favorability.

Current Momentum

v1.0

No release notes available.

Competition

Rivals identification in progress

7-Day Rank Pulse 🇺🇸

Games

No ranking data

Rating Pulse 🇺🇸

What makes this app unique?

What Does It Look Like?

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What Are The Key Features?

Observation ModeStandard

Users can move their point of view to observe carp and goldfish from various angles.

Favorability SystemStandard

Players tap on fish to increase their favorability, which can be exchanged for in-game currency.

In-Game ShopStandard

Users can purchase additional carp and goldfish using diamonds earned through gameplay or advertisements.

Mini-gamesStandard

Players can participate in mini-games to earn diamonds for use in the shop.

How much does it cost?

Freemium

Who Built It?

Analysis in progress, available soon

What do users think recently?

Analysis in progress, available soon

View the full user-sentiment analysis

Mood gauge, ratings & review-volume history, every praise / complaint / request, and sentiment over time.

Go deeper

Analysis in progress, available soon

What is the competitive landscape for Koi - Aquarium?

How's The Games Market?

How does it evolve in the Games market?

Rank progression

1 active ranking tracked — 30-day window

No rank history available for this chart.

Strategic analysis coming soon

SWOT, key takeaways & outlook

The outtake for Koi - Aquarium

Key Takeaways

This is a minimalist, ad-supported aquarium simulation centered on passive observation and simple interaction mechanics.

Where Is It Heading?

Trend analysis

Available very soon

Disclosure: Independent intel to help mobile builders succeed.

AI-powered analysis with editorial review, built from publicly available sources. Marlvel.ai is not affiliated with, endorsed by, or sponsored by Koi - Aquarium, its developer, the app publisher, Apple, or Google Play. All trademarks, logos, and screenshots referenced remain the property of their respective owners.

Cite this report

Marlvel.ai. “Koi - Aquarium Intelligence Report.” Updated May 9, 2026. https://marlvel.ai/apps/koi-aquarium

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Data licensed under CC-BY-NC 4.0