N vs Onikeisan
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
N
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Equations keep coming, and you answer the one you saw a few turns ago while calculating the next. Memorising and calculating at the same time, a dual task that keeps your head working. This is the N-back task, a working memory exercise. SLEEP & SCORE (APPLE HEALTH) - Reads sleep and steps from Apple Health. "Sleep & Score" in the Review tab shows last night's sleep, today's steps, and your accuracy by how long you slept - "What Health reveals" answers questions from your own records, such as how many hours of sleep make you sharpest and how far two short nights pull your score down (Premium) - Saves how your mind feels after each round to Apple Health as State of Mind - Health data stays on this device and is never sent anywhere. Not for medical use KNOW YOUR MENTAL CONDITION - After every round, slide along a color band to record how your mind feels, from foggy to clear - "When your mind feels clear" ranks when you most often feel clear, such as mornings, your first round of the day, or after a break - "Mood and score" plots each round so you can check whether clearer rounds score higher THREE INPUT MODES - Tap: answer quickly with number buttons - Writing: write the digit on screen with your finger - Listening: the equation is read aloud and never shown. Keep your eyes closed, listen, remember, and write BUILT FOR HABIT - One short session a day - Streak counting - Record how your head feels after each session WHAT YOU LEAVE BEHIND - A graph of how far up the levels you have climbed - The hours you tend to practise, and total time - A calendar showing which days you played WHERE YOU STAND - Connect Game Center to see your rank in the world - Today, this week, and all time - Ranks are free for everyone INSIGHTS - Once enough sessions pile up, the app names a pattern you would not notice yourself - Accuracy runs higher on mornings; a level you lost tends to return after a rest day - Differences between levels are factored out, so moving up alone is never called "doing well" - Available on devices with Apple Intelligence, processed entirely on device MAKE IT YOURS - Set the number of questions and the time limit - Choose a starting level, up to the highest you have reached - Three colour themes - iPhone and iPad 1 5 minutes a day is enough to start. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://note.com/toastar/n/n9e6b03d99470
Onikeisan
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「鬼計算 - N-Back 脳トレ」は、次々と表示される計算問題の「N問前の答え」を記憶して答える、シンプルながら奥深い脳トレゲームです。ワーキングメモリ(作業記憶)を効果的に鍛え、集中力や情報処理能力の向上を目指しましょう! 【ゲームのルール】 画面に「A + B = ?」のような簡単な計算式が1問ずつ表示されます。 あなたの役目は、今表示されている問題ではなく、「N問前に表示された問題」の答えを入力することです。(Nは選択した難易度によって変わります) 1問目(1-Backの場合)は答える必要はありません。 各問題には短い制限時間があります。素早く、正確に答えましょう! 1セットは最大5分間。時間内にできるだけ多くの問題に挑戦しましょう。 【主な機能】 選べる難易度「N-Back」: 最初は簡単な「1-Back」(1問前の答え)からスタート。 正答率90%以上を達成すると、より難しい「2-Back」「3-Back」…と、最大「20-Back」までのレベルがアンロック!自分の限界に挑戦できます。 集中力を高める時間制限: 1セット5分間の集中トレーニング。 各問題にも10秒の時間制限があり、テンポよく進められます。 毎日の習慣化をサポート: 連続プレイ日数と自己ベストを記録する「ストリーク機能」。 指定した時間にトレーニングを促す「デイリー通知機能」(ON/OFF、時刻設定可能)。 成長を実感「プレイ履歴」: 過去のプレイ結果(日付、N-Backレベル、スコア、正答率)を確認できます。 分かりやすいチュートリアル: 初めての方でも安心。ゲームのルールと操作方法を丁寧に解説します。 シンプルで使いやすい入力: 押し間違いの少ない、専用の数字キーパッドを採用。 【こんな方におすすめ】 記憶力や集中力を向上させたい方 脳を活性化させたい方 スキマ時間に手軽に脳トレしたい方 数字や計算が好きな方 自分の限界に挑戦したい方 さあ、あなたも「鬼計算」で脳の限界に挑戦してみませんか? 今すぐダウンロードして、毎日の脳トレ習慣を始めましょう!
Screenshots
Verdict
The clearest difference is in-app purchases: Onikeisan at none against N's 1. Onikeisan also leads on ads (none vs shown) and iOS requirement (12.0 vs 26.0). On price, update cadence and device support 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
Both are free to download. N sells 1 in-app purchase, starting at $7.49 per month. Onikeisan asks for nothing beyond the download.
N ships an update every 8 days, Onikeisan every 9 days. The most recent releases landed on November 12, 2026 and October 30, 2026 respectively.
| Parameter | N | Onikeisan |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 8 days — better | Every 9 days |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 26.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 28 MB | 37 MB |
| Age rating | 4+ | 4+ |
| Developer | chunson yamada | iori kojima |
In-app purchases
N
- 1ヶ月プラン14 Days trial$7.491 Month
Onikeisan
No in-app purchases








