--- title: "Koi - Aquarium — App Overview" url: https://marlvel.ai/intel-report/simulation/koi-aquarium-1 category: Simulation developer: HAREPPO platforms: android rating: 4.8 (23 ratings) pricing: freemium report_level: overview generated: 2026-05-09 last_verified: "2026-05-09T14:33:48.031Z" --- > **Key Insight:** This is a minimalist, passive simulation app centered on the collection and observation of virtual fish. | Metric | Value | |--------|-------| | Category | Simulation | | Rating | 4.8 ★ (23) | | Pricing | freemium | | Platforms | Android | | Latest Version (Android) | 1.0.7 | | Developer | HAREPPO | ## What is Koi - Aquarium? Koi - Aquarium is a simulation app by HAREPPO that allows users to observe carp and goldfish in a virtual environment. The experience focuses on passive viewing and interaction, enabling users to increase fish populations through a simple engagement loop. ## Key Features - **Observation Mode**: Users can adjust their point of view to observe fish from various angles. - **Interaction System**: Tapping on fish increases their liking, which serves as a currency for the shop. - **In-App Economy**: Users exchange accumulated liking for diamonds to purchase additional carp and goldfish. - **Daily Rewards**: The app provides a function to collect diamonds multiple times per day. ## Who is it for? Casual users seeking a low-stress, visual simulation experience. ## Links - [Google Play](https://play.google.com/store/apps/details?id=com.netk.Koi&hl=en&gl=us) - [Full Intelligence Report](https://marlvel.ai/intel-report/simulation/koi-aquarium-1) --- *This is an overview report. Sentiment analysis, competitive landscape, and SWOT analysis are available in the [full intelligence report](https://marlvel.ai/intel-report/simulation/koi-aquarium-1).* *Generated by [Marlvel.ai](https://marlvel.ai) — Independent app intelligence.*