Comparison

Mental Math vs おかね脳トレ

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

Head to head
About

Mental Math

Train your calculation skills with this app by solving math problems against the clock. Customize the time limit and number of questions for a personalized challenge. Review your results to track progress and improve your math abilities.

Highlights
  • Solve math problems against a time limit
  • Customize time limit and number of problems
  • Review calculation results
  • Simple and comfortable user interface
  • Gaming experience for spare time
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This is a calculation training app where you can solve math problems within a predetermined time limit. You can customize the time limit and the number of problems according to your preferences. Once the problems are completed, the calculation results are displayed, and you can make use of them in the future. The problem interface has been designed to be as simple as possible, ensuring comfortable usability. With a short time limit, you can play and solve problems in your spare time, enjoying a gaming experience. If you have any requests or suggestions, you can submit them through the app. Please feel free to actively utilize it if there are any features you desire.

About

おかね脳トレ

Features
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年金の手取り、医療費の自己負担、買い物のおつり。暮らしに出てくるお金の数字だけで、1日10問の計算練習ができます。 ■ できること ・1日10問。3分ほどで終わります ・問題は21種類(おつり、割引、消費税、年金の手取り、年金の繰下げ、医療費の窓口負担、医療費控除、貯金がもつ期間 など) ・1問ごとに、正解と計算のしかたをその場で表示 ・つづけた日数、今月やった日、正答率を記録 ・途中でやめても、その日のうちは続きから ・むずかしさを3段階から選べます ・文字の大きさを3段階から選べます ・毎日のお知らせ(希望する方のみ) ■ Pro(買い切り) ・広告なし ・1問ごとに、ひとことの解説と出典を表示 ・まちがえた問題を、数字を変えてやり直し ・おかわり10もん(別の問題を何度でも) ・種類をえらんで練習 ・種類べつの成績と、2週間のグラフ 月額の支払いはありません。一度のお支払いでずっと使えます。 ■ 問題に出てくる制度の数字 日本年金機構、国税庁、厚生労働省、総務省の公表資料で確かめた数字を使っています(令和8年度)。 ※ このアプリは計算の練習をするものです。表示する金額は一例で、実際の金額は制度や自治体によって異なります。

Screenshots

Mental Math4 screens
おかね脳トレ4 screens

Verdict

The call

The clearest difference is in-app purchases: Mental Math at none against おかね脳トレ's 1. Mental Math also leads on iOS requirement (13.0 vs 16.4). On price, update cadence, ads 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. おかね脳トレ sells 1 one-off in-app purchase. Mental Math asks for nothing beyond the download.

UpkeepUpdate frequency

Mental Math ships an update every 6 days, おかね脳トレ every 9 days. The most recent releases landed on October 15, 2026 and October 25, 2026 respectively.

Scorecard2 real differences · 8 level
Mental Math versus おかね脳トレ: the parameters behind the verdict, then further details
ParameterMental Mathおかね脳トレ
PriceFreeFree
Rating4.5 (4 ratings) — better—
Positive reviews75.0% of reviews—
Number of ratings4 — better—
Update frequencyEvery 6 days — betterEvery 9 days
AdsYesYes
In-app purchasesNo — betterYes
MonetizationAd-supported—
DevicesiPhone, iPod — betteriPhone
Requires iOS13.0 — better16.4
Further details — not scored
Size67 MB40 MB
Age rating4+4+
DeveloperYudai KitanoKODAI MURAKAMI

In-app purchases

None

Mental Math

No in-app purchases

1 purchases

おかね脳トレ

One-time1
  • Pro(広告なし・全機能)$3.99

Questions

Is Mental Math free?
Mental Math is free to download, with no in-app purchases.
Is おかね脳トレ free?
おかね脳トレ is free to download, with in-app purchases available.
Do Mental Math or おかね脳トレ have ads?
Both Mental Math and おかね脳トレ show ads.
Which is updated more often, Mental Math or おかね脳トレ?
Mental Math ships an update every 6 days, and おかね脳トレ every 9 days. Most recently, Mental Math was updated on October 15, 2026 and おかね脳トレ on October 25, 2026.

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