Comparison

あかほん! プロトタイプA vs ProbabilityPlayer

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

Head to head
About

あかほん! プロトタイプA

This app uses a unique story-driven approach to help users learn calculus concepts like differentiation. Follow characters through engaging dialogues that explain complex math topics at your own pace.

Highlights
  • Story-driven learning
  • Interactive dialogues
  • Calculus concepts (differentiation)
  • Character-based guidance
  • NOVELICA system
  • Self-paced learning
Features
Read full description

勉強ともっと仲良くなれる学習支援アプリ あかほん! あかほん! プロトタイプA -微分・積分編- は愉快なキャラクターと一緒に数学の勉強をしていくショートストーリーが読めるアプリです。 勉強って自分との戦いだけれど、気を詰めすぎて疲れてしまう 一緒に勉強をしてくれる仲間がほしい そんなあなたにこのアプリはぴったりです! -ストーリー- 主人公のシキネは偏差値18の高校3年生、このままでは受験に失敗すると悩んでいました。 そこで飛び級小学生と噂される小柄な女の子スウに数学を教えてもらうことにしました。 「飛び級でも小学生でもない」と最初は怒られてしまいますが、スウは優しいので勉強を教えてくれました。 スウは大好きな数学について語るのがとてもても楽しく、まんざらでもなかったのです。 シキネもわからないなりにスウの楽しげな話を聞いて、少しずつ理解を深めていきます。 今回の話題は微分。微分って一体何なんでしょうか?? このアプリは新開発されたNOVELICAというシステムで動いています。 動画のように進みつつも、大事なところでは待ってくれたり、問いかけてくれます。 会話の聞き返しやスキップは動画よりも直感的。 自分のペースで2人の会話を楽しみながら、いつの間にか数学の知識が身についている、そんなアプリです。 2人との勉強をお楽しみください!

About

ProbabilityPlayer

Practice probability problems for the Kyotsu Test, a common Japanese university entrance exam. This app focuses on mathematical probability questions and includes diagrams to aid understanding. It is designed to help students prepare for this specific academic assessment.

Highlights
  • Probability problem practice
  • Kyotsu Test focus
  • Mathematical probability
  • Diagrams included
  • University entrance exam prep
Features
Read full description

This is an app for Kyotsu Test, the test widely used in Japanese university entrance exams, dealing especially with probability problems in mathematics. I have applied to the rights holder to use the test.

Screenshots

あかほん! プロトタイプA4 screens
ProbabilityPlayer4 screens

Verdict

The call

The clearest difference is in-app purchases: あかほん! プロトタイプA at none against ProbabilityPlayer's 1. あかほん! プロトタイプA also leads on iOS requirement (7.0 vs 18.0). 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. ProbabilityPlayer sells 1 one-off in-app purchase. あかほん! プロトタイプA asks for nothing beyond the download.

UpkeepUpdate frequency

あかほん! プロトタイプA ships an update every 4 weeks, ProbabilityPlayer monthly. The most recent releases landed on September 21, 2026 and September 27, 2026 respectively.

Scorecard3 real differences · 7 level
あかほん! プロトタイプA versus ProbabilityPlayer: the parameters behind the verdict, then further details
Parameterあかほん! プロトタイプAProbabilityPlayer
PriceFreeFree
Rating5.0 (1 ratings) — better—
Positive reviews—100.0% of reviews
Number of ratings1 — better—
Update frequencyEvery 4 weeks — betterMonthly
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS7.0 — better18.0
Further details — not scored
Size88 MB9 MB
Age rating4+4+
DeveloperNobumitsu ShikineMotonari Hibi

Customer experience

あかほん! プロトタイプA

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

ProbabilityPlayer

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

あかほん! プロトタイプA

No in-app purchases

1 purchases

ProbabilityPlayer

One-time1
  • Premium$1.99

Questions

Is あかほん! プロトタイプA free?
あかほん! プロトタイプA is free to download, with no in-app purchases.
Is ProbabilityPlayer free?
ProbabilityPlayer is free to download, with in-app purchases available.
Do あかほん! プロトタイプA or ProbabilityPlayer have ads?
Neither あかほん! プロトタイプA nor ProbabilityPlayer shows ads.
Which is updated more often, あかほん! プロトタイプA or ProbabilityPlayer?
あかほん! プロトタイプA ships an update every 4 weeks, and ProbabilityPlayer monthly. Most recently, あかほん! プロトタイプA was updated on September 21, 2026 and ProbabilityPlayer on September 27, 2026.

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