js vs ProbabilityPlayer
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
js
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Explanation: STAR is a nickname for statistical analysis program developed for personal computers.(STatistical Analysis Rescuers). Main functions Β· Fisher's exact test 1 x 2 Β· Fisher's exact test 1 x 2 (P1 not equal P2) Β· Fisher's exact test 2 x 2 Β· Chi-square Test 1 x J Β· Chi-square Test i x J Β· Add Grade1 x 2 β Method of use (1) Start the "js-STAR" app. (2) Tap the [ frequency test ] button (3) Enter a number where two or four square cells are displayed. (4) Tap the [ Calculate!" ] Button. (5) Result is output to the TextField. β Disclaimer (1) This may not run correctly depending on the iOS version or model. (2) The creator shall not bear any responsibility for any damage caused to the user when downloading the app.
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.
- Probability problem practice
- Kyotsu Test focus
- Mathematical probability
- Diagrams included
- University entrance exam prep
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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
Verdict
The clearest difference is in-app purchases: js at none against ProbabilityPlayer's 1. js also leads on iOS requirement (13.0 vs 18.0). ProbabilityPlayer's advantage is update cadence (monthly vs every 2 months). On price, ads and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. ProbabilityPlayer sells 1 one-off in-app purchase. js asks for nothing beyond the download.
js ships an update every 2 months, ProbabilityPlayer monthly. The most recent releases landed on September 14, 2026 and August 27, 2026 respectively.
| Parameter | js | ProbabilityPlayer |
|---|---|---|
| Price | Free | Free |
| Positive reviews | β | 100.0% of reviews |
| Update frequency | Every 2 months | Monthly β better |
| Ads | No | No |
| In-app purchases | No β better | Yes |
| Monetization | β | Free with in-app purchases |
| Devices | iPhone, iPad, iPod β better | iPhone, iPad |
| Requires iOS | 13.0 β better | 18.0 |
| Further details β not scored | ||
| Size | 1 MB | 9 MB |
| Age rating | 9+ | 4+ |
| Developer | Hiroyuki Nakano | Motonari Hibi |
In-app purchases
js
No in-app purchases
ProbabilityPlayer
- Premium$1.99
Questions
Is js free?
Is ProbabilityPlayer free?
Do js or ProbabilityPlayer have ads?
Which is updated more often, js or ProbabilityPlayer?
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