Comparison

Let's Count 123 vs Onikeisan

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

Head to head
About

Let's Count 123

Features
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It is an application to solve the problem of considering the number of dots or cubes. From young children who have begun to be interested in numbers, adults who want to train the right brain can enjoy a wide range. Even children who do not know the numbers yet, by playing like tiddlywinks and building blocks, You can naturally learn the concept of numbers and increase the cognitive power of space. [Specification] - You can choose from a small number to a maximum of 99, 5 difficulty levels. - You can count dots and cubes one by one with your fingers and count them. - You can change the viewing angle. - Since there is no game over, You can work over it until you answer correctly. - With 5 correct answers, your best time is recorded and you can compete with time attack. - “Rest” is a stage of relaxing, just grabbing and moving things and playing. [Providing materials] - music/ sound : Maoh-Damashii, Pocket Sound

About

Onikeisan

Features
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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

Let's Count 1234 screens
Onikeisan2 screens

Verdict

The call

The clearest difference is ads: Onikeisan at none against Let's Count 123's shown. Onikeisan also leads on update cadence (every 9 days vs every 5 months). Let's Count 123's advantage is iOS requirement (10.0 vs 12.0). On price, in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Let's Count 123 ships an update every 5 months, Onikeisan every 9 days. The most recent releases landed on October 26, 2026 and October 30, 2026 respectively.

Scorecard3 real differences · 3 level
Let's Count 123 versus Onikeisan: the parameters behind the verdict, then further details
ParameterLet's Count 123Onikeisan
PriceFreeFree
Update frequencyEvery 5 monthsEvery 9 days — better
AdsYesNo — better
In-app purchasesNoNo
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS10.0 — better12.0
Further details — not scored
Size95 MB37 MB
Age rating4+4+
DeveloperTakahiro Yamadaiori kojima

In-app purchases

None

Let's Count 123

No in-app purchases

None

Onikeisan

No in-app purchases

Questions

Is Let's Count 123 free?
Let's Count 123 is free to download, with no in-app purchases.
Is Onikeisan free?
Onikeisan is free to download, with no in-app purchases.
Do Let's Count 123 or Onikeisan have ads?
Let's Count 123 shows ads; Onikeisan does not.
Which is updated more often, Let's Count 123 or Onikeisan?
Let's Count 123 ships an update every 5 months, and Onikeisan every 9 days. Most recently, Let's Count 123 was updated on October 26, 2026 and Onikeisan on October 30, 2026.

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