Comparison

ProbabilityPlayer vs 暗算Blitz

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

Head to head

ProbabilityPlayer

Kyotsu Test Math Run & Diagram

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.

About

暗算Blitz

Features

Read full description

99×99までのかけ算でらくらく計算できるパターンを網羅。苦手なパターンだけを徹底練習できます。問題ごとに解法が参照できるので「これどうやるんだったっけ？」という疑問もすぐに解決。

Screenshots

ProbabilityPlayer4 screens

暗算Blitz3 screens

Verdict

The call

The clearest difference is ads: ProbabilityPlayer at none against 暗算Blitz's shown. 暗算Blitz's advantage is update cadence (daily vs monthly). On price, 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

Both are free to download. ProbabilityPlayer sells 1 one-off in-app purchase and 暗算Blitz sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

ProbabilityPlayer ships an update monthly, 暗算Blitz daily. The most recent releases landed on October 13, 2026 and October 20, 2026 respectively.

Scorecard2 real differences · 6 level

ProbabilityPlayer versus 暗算Blitz: the parameters behind the verdict, then further details
Parameter	ProbabilityPlayer	暗算Blitz
Price	Free	Free
Positive reviews	100.0% of reviews	—
Update frequency	Monthly	Daily — better
Ads	No — better	Yes
In-app purchases	Yes	Yes
Monetization	Free with in-app purchases	—
Devices	iPhone, iPad	iPhone, iPad
Requires iOS	18.0	17.6 — better
Further details — not scored
Size	9 MB	54 MB
Age rating	4+	4+
Developer	Motonari Hibi	Toshihide KAWAI

In-app purchases

1 purchases

ProbabilityPlayer

One-time1

Premium$1.99

1 purchases

暗算Blitz

One-time1

プレミアム・ユーザー$14.99

Questions

Is ProbabilityPlayer free?

ProbabilityPlayer is free to download, with in-app purchases available.

Is 暗算Blitz free?

暗算Blitz is free to download, with in-app purchases available.

Do ProbabilityPlayer or 暗算Blitz have ads?

暗算Blitz shows ads; ProbabilityPlayer does not.

Which is updated more often, ProbabilityPlayer or 暗算Blitz?

ProbabilityPlayer ships an update monthly, and 暗算Blitz daily. Most recently, ProbabilityPlayer was updated on October 13, 2026 and 暗算Blitz on October 20, 2026.