Comparison

Hanafuda・Koi Koi vs BitFlip

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

Head to head
About

Hanafuda・Koi Koi

Experience a traditional Japanese card game played with Hanafuda cards. The objective is to form specific card combinations, known as 'yaku', before your opponent. Choose to cash in your points or continue playing for higher scores by saying 'koi-koi'.

Highlights
  • Play traditional Japanese card game
  • Use Hanafuda cards
  • Form 'yaku' card combinations
  • Score points by making combinations
  • Option to 'koi-koi' for more points
Features
Read full description

Koi-Koi (Japanese: こいこい) is a popular card game in Japan played with Hanafuda cards which is one of ways to play Hanafuda(Japanese playing cards) with two players. The goal of the game is to make the combination of severalcards earlier than your opponent. The phrase "koi-koi" means "come on" in Japanese which is said when the player wants to continue the hand. The object of the game is to form special card combinations called "yaku" from cards accumulated in a point pile. Players can gain cards in their point piles by matching cards in their hands, or drawn from the draw pile, with cards on the table. Once a yaku has been made, a player can stop to cash in points, or keep going (referred to as "koi-koi", hence the name of the game) to form additional yaku for more points. The point values assigned to individual cards have no effect on the score, but they are helpful to judge their value in forming yaku.

About

BitFlip

Features
Read full description

BITFLIPは、2進数と10進数の変換を楽しみながら学べる頭脳派パズルゲームです。 【遊び方】 画面に表示された数字を変換して入力するだけ。シンプルなルールで、誰でもすぐに始められます。 2進数→10進数 10進数→2進数 の2つのモードから選んで挑戦しましょう。 【2つのプレイスタイル】 ▶タイムアタック 制限時間30秒からスタート。正解すると+3秒、不正解で-3秒。時間が切れたらゲームオーバー。どこまでスコアを伸ばせるか? ▶ライフ制 ミスが3回でゲームオーバー。焦らずじっくり考えて、より多くの問題に正解しよう。 【難易度が自動上昇】 正解を重ねるごとにビット数が増加(3ビット〜8ビット)。初心者から上級者まで、常に適切な難易度で楽しめます。 【こんな方におすすめ】 ・プログラミングを学んでいる方 ・IT・情報系の資格勉強中の方 ・脳トレとして数字パズルを楽しみたい方 ・ハイスコアを追い求めたい方

Screenshots

Hanafuda・Koi Koi4 screens
BitFlip3 screens

Verdict

The call

The clearest difference is iOS requirement: Hanafuda・Koi Koi at 13.0 against BitFlip's 26.4. On price, update cadence, ads and in-app purchases 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. Hanafuda・Koi Koi sells 1 one-off in-app purchase and BitFlip sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Hanafuda・Koi Koi ships an update every 5 weeks, BitFlip every 2 months. The most recent releases landed on October 25, 2026 and October 11, 2026 respectively.

Scorecard1 real difference · 9 level
Hanafuda・Koi Koi versus BitFlip: the parameters behind the verdict, then further details
ParameterHanafuda・Koi KoiBitFlip
PriceFreeFree
Rating4.6 (559 ratings) — better—
Positive reviews56.3% of reviews—
Number of ratings559 — better—
Update frequencyEvery 5 weeks — betterEvery 2 months
AdsYesYes
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13.0 — better26.4
Further details — not scored
Size134 MB16 MB
Age rating4+4+
Developer慧 姚kodai takiguchi

Bugs and requests

Hanafuda・Koi Koi

Reported bugs

10 issues
  • App crashes frequently, especially with Facebook ads
  • Ads freeze without countdown timer
  • Ads lack close buttons or are difficult to close
  • App crashes on startup (some devices)
  • Music/BGM not working properly
Show 5 more
  • Card selection sensitivity causes wrong card to be played
  • Koi-koi dialog obscures game board completely
  • Display issues with newer iPhone models (notch obstruction)
  • Ad-removal purchases not restored after updates
  • Incorrect yaku point values compared to official rules

Requested features

10 requests
  • Multiplayer functionality (online or local)
  • Ability to review scored cards during koi-koi decision
  • Landscape mode support with better card visibility
  • Option to cancel card selection after dragging
  • Full English translation of all game elements
Show 5 more
  • Paid ad-removal option
  • 12-month full game length option
  • Better koi-koi decision dialog placement
  • Music/BGM improvements
  • Improved card selection UI for duplicate matches

BitFlip

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

Hanafuda・Koi Koi

One-time1
  • Remove Ads$3.99
1 purchases

BitFlip

One-time1
  • 広告を削除$1.99

Questions

Is Hanafuda・Koi Koi free?
Hanafuda・Koi Koi is free to download, with in-app purchases available.
Is BitFlip free?
BitFlip is free to download, with in-app purchases available.
Do Hanafuda・Koi Koi or BitFlip have ads?
Both Hanafuda・Koi Koi and BitFlip show ads.
Which is updated more often, Hanafuda・Koi Koi or BitFlip?
Hanafuda・Koi Koi ships an update every 5 weeks, and BitFlip every 2 months. Most recently, Hanafuda・Koi Koi was updated on October 25, 2026 and BitFlip on October 11, 2026.

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