Comparison

Abacus Practice vs 脳内そろばん

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

Head to head
About

Abacus Practice

Practice abacus, mental arithmetic, and calculation skills on your iPhone or iPad. Features a realistic abacus interface for various exercises, including addition, subtraction, multiplication, division, and flash calculations. Track your progress and review your performance over time.

Highlights
  • Realistic abacus interface
  • Practice addition, subtraction, multiplication, division
  • Flash and slip calculations
  • Customizable problem generation
  • Practice history and performance records
  • Adjustable settings for sound, vibration, and left-handed mode
Features
Read full description

Build an answer with beads. Check it, then try your mistakes again. Abacus Practice brings Japanese soroban and mental arithmetic practice to iPhone and iPad. Use the on-screen abacus, work with your own physical soroban, or answer mentally. LEARN AND PRACTICE • 16 introductory lessons with bead movement demonstrations • Addition, subtraction, multiplication and division • Flash mental arithmetic with adjustable speed and column-style drills • Answer checking, per-question results and mistake-only review • Start another session with your previous practice settings CREATE YOUR OWN DRILLS Generate problems from selected conditions and practice them in the app. Timed mock exams show answer progress and scores by subject. These are practice formats based on Japanese soroban exams, not official examinations or a guarantee of passing. FIND YOUR FAVORITE BEADS The standard wooden beads have a detailed natural texture. Pro adds skins including springy mint Jelly and transparent Glass, each with a distinct feel and sound. Try extra skins in the interactive preview before purchase. Sound, haptics and left-handed layout are adjustable. FREE AND PRO Introductory lessons, basic practice, a free abacus, and selected problem-generation and mock-exam options are available free. A one-time Pro purchase unlocks expanded practice conditions, advanced problem generation, PDF worksheet creation and sharing, additional exam levels, and extra skins. There is no monthly subscription. No account or ads. Practice records are stored on this device. Now available in Japanese, English, Simplified Chinese, Traditional Chinese and Korean. Screens, all 16 introductory lessons, instructions, purchases and restore, practice history and PDFs follow your app language. Change it directly in Settings > App language inside the app; your choice applies immediately. There are six skins in total: standard Amber is free; Pro adds Walnut, Red & Ivory, Indigo, Jelly and Glass. The free abacus uses a large landscape board with minimal controls so you can focus on moving the beads.

About

脳内そろばん

Features
Read full description

「脳内そろばん」は、そろばん式の暗算が身につくトレーニングアプリです。 画面のそろばんを指ではじいて練習するうちに表示が少しずつ消えていき、最後は頭の中のそろばんだけで計算できるようになります。 ■ 本物のように動くそろばん ・タップやスワイプで珠が動き、連動する珠も本物と同じ動きをします ・「数を作る」「数を読む」から計算まで、基礎から順にステップアップ ・まちがえたときは、正しい珠の動きをゆっくりお手本再生 ■ イメージ暗算(5つのステップ) ・常時表示 → お手本 → 半透明 → 一瞬だけ表示 → 数字のみ ・成績に合わせて次のステップが自動で解放。難しければいつでも前のステップに戻れます ■ フラッシュ暗算 ・桁数・口数・表示スピード(最速0.3秒)を細かく設定できます ・そろばん補助表示で、途中経過を珠のイメージで追いながら練習できます ■ 1日3分の「今日のトレーニング」 ・回答の記録からにがてな分野を分析し、復習メニューを自動で組み立てます ・連続練習日数の記録と毎日のミッションで、練習が習慣になります ■ 成長が見える成績画面 ・正答率・回答スピード・能力のバランスをグラフで表示 ・「5をまたぐ計算」「繰り上がり」「繰り下がり」など、つまずきの傾向も分かります ■ 保護者向けの学習レポート ・週ごとの学習時間・正答率・分野別の成績と、声かけのヒントを確認できます ・お子さまが誤って開かないよう、保護者確認つきです ■ 続けたくなる仕掛け ・経験値とレベル、コンボ、きょうのミッション ・レベルが上がると新しいそろばんのデザインが解放されます ■ 家庭で安心して使える設計 ・アカウント登録は不要。学習データは端末とご自身の iCloud にのみ保存されます(開発者には送信されません) ・機種変更や2台目の端末でも、iCloud 経由で学習データを引き継げます ・広告なし。トラッキングもありません ・上級コンテンツの購入(買い切り1回のみ)の前には、保護者確認の画面が表示されます そろばん教室に通うお子さまの家庭練習にも、はじめてそろばんに触れる方にもお使いいただけます。

Screenshots

Abacus Practice4 screens
脳内そろばん4 screens

Verdict

The call

The clearest difference is price: 脳内そろばん at Free against Abacus Practice's $0.99. 脳内そろばん also leads on update cadence (monthly vs every 4 months). On ads, in-app purchases, device support and iOS requirement 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

脳内そろばん is free to download; Abacus Practice costs $0.99 up front. Abacus Practice sells 1 one-off in-app purchase and 脳内そろばん sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Abacus Practice ships an update every 4 months, 脳内そろばん monthly. The most recent releases landed on October 25, 2026 and October 23, 2026 respectively.

Scorecard2 real differences · 6 level
Abacus Practice versus 脳内そろばん: the parameters behind the verdict, then further details
ParameterAbacus Practice脳内そろばん
Price$0.99Free — better
Positive reviews100.0% of reviews—
Update frequencyEvery 4 monthsMonthly — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad — betteriPhone
Requires iOS17.017.0
Further details — not scored
Size18 MB5 MB
Age rating4+4+
DeveloperSMART BIT K.KRyo Sato

In-app purchases

1 purchases

Abacus Practice

One-time1
  • Pro Unlock$2.99
1 purchases

脳内そろばん

One-time1
  • プレミアム$3.99

Questions

Is Abacus Practice free?
Abacus Practice costs $0.99, and also offers in-app purchases.
Is 脳内そろばん free?
脳内そろばん is free to download, with in-app purchases available.
Do Abacus Practice or 脳内そろばん have ads?
Neither Abacus Practice nor 脳内そろばん shows ads.
Which is updated more often, Abacus Practice or 脳内そろばん?
Abacus Practice ships an update every 4 months, and 脳内そろばん monthly. Most recently, Abacus Practice was updated on October 25, 2026 and 脳内そろばん on October 23, 2026.

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