Report updated Apr 17, 2026
Koikoi
For fans of traditional Japanese card games and casual gamers looking for a classic, ad-free Hanafuda experience.
Koikoi is an established games app that is a paid app. With a 3.4/5 rating from 5 reviews, it shows polarized user reception.
What is Koikoi?
Current Momentum
v2.0
The developer has changed from Googoleplex Ltd. to Hayashi Koichi's own business. This is why the support URL has been changed.
Active Nemesis
ザ・花札 - 「花合わせ」と「こいこい」が遊べるカードゲーム
By UNBALANCE
Other Rivals
7-Day Rank Pulse 🇺🇸
CasinoRating Pulse 🇺🇸
What makes this app unique?
What Does It Look Like?
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What Are The Key Features?
Traditional Japanese card game mechanics based on matching cards by month
Automatically saves game progress and history for the user
Competitive format where the winner is determined by the highest total score after 12 games
Allows players to choose between finishing a round for points or continuing for higher stakes
How much does it cost?
- One-time purchase of $1.99
The app utilizes a straightforward premium model with no in-app purchases, targeting users who prefer a one-time payment over ad-supported or freemium models.
Who Built It?
Kouichi Hayashi
Preserving a niche portfolio of 3D hobby simulations and traditional Japanese card games for a dedicated enthusiast community.
Portfolio
13
Apps
What other apps does Kouichi Hayashi make?
Explore the full Kouichi Hayashi report
Portfolio breakdown, audience, momentum, and every app published by Kouichi Hayashi.
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.
What is the competitive landscape for Koikoi?
Where is it available?
Localized markets (2)
How's The Games Market?
How does it evolve in the Games market?
Rank progression
38 active rankings tracked — 30-day window
The rivals identified
The outtake for Koikoi
Strengths to defend, gaps to attack
Core Strengths
- Ad-free premium experience
- Authentic traditional rules
- Long-term platform stability
Critical Frictions
- Low review volume
- Dated UI/UX
- Lack of social/online features
Growth Levers
- UI modernization
- Introduction of a freemium 'Lite' version
- Western market localization/tutorials
Market Threats
- Rise of online-enabled competitors
- High-polish titles from major developers
- Stagnant App Store visibility
Key Takeaways
Koikoi is an established games app that is a paid app. With a 3.4/5 rating from 5 reviews, it shows polarized user reception.
Where Is It Heading?
Trend analysis
Available very soon