Comparison

StroopEffect2 vs 算数忍者〜九九の巻〜完全版

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

Head to head
About

StroopEffect2

This app demonstrates the psychological phenomenon known as the Stroop effect. It presents a time-trial game where users must identify the color of words, even when the word itself names a different color. It's a fun way to explore cognitive processing and reaction times.

Highlights
  • Stroop effect demonstration
  • Time trial game mode
  • Cognitive processing experiment
  • Reaction time measurement
  • Educational psychology tool
Features
Read full description

Stroop Effect Experiment app. Time Trial Game. Stroop Effect(from WIKIPEDIA in 2011.01.21) In psychology, the Stroop effect is a demonstration of the reaction time of a task. When the name of a color (e.g., "blue," "green," or "red") is printed in a color not denoted by the name (e.g., the word "red" printed in blue ink instead of red ink), naming the color of the word takes longer and is more prone to errors than when the color of the ink matches the name of the color.

About

算数忍者〜九九の巻〜完全版

Features
Read full description

3日で九九をマスターしたという声も!思わず夢中になる仕組みでお子さんのモチベーションをしっかり維持。楽しく習得できます。 累計で300万ダウンロード!解答数12億問を突破したPSGシリーズの大人気作『算数忍者』で九九を学びましょう! 【どんなアプリ?】 主人公の忍者と九九の修行を積みながら、テンポよく反復練習できるゲーム形式の学習アプリです。 【親も安心】 成績表機能で、お子さんの正解数、不正解数、苦手な段を確認できるので、目標や課題が一目で把握できます。学校での学習サポートや、復習にも活用。 【モチベーション維持できる工夫】 かけ算を覚えるには反復練習が基本。でも、同じことの繰り返しは飽きてしまう…。 そんなお子さんも、リズムよく目、耳、指を使ってらくらく暗記するゲームなら楽しく続けられます。

Screenshots

StroopEffect24 screens
算数忍者〜九九の巻〜完全版4 screens

Verdict

The call

The clearest difference is review sentiment: StroopEffect2 at 100% against 算数忍者〜九九の巻〜完全版's 0%. StroopEffect2 also leads on price ($2.99 vs $4.99). 算数忍者〜九九の巻〜完全版's advantage is update cadence (every 5 months vs every 14 months) and iOS requirement (11.0 vs 15.6). On ads, in-app purchases 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

StroopEffect2 costs $2.99 and 算数忍者〜九九の巻〜完全版 $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

StroopEffect2 ships an update every 14 months, 算数忍者〜九九の巻〜完全版 every 5 months. The most recent releases landed on September 18, 2026 and September 10, 2026 respectively.

Scorecard4 real differences · 4 level
StroopEffect2 versus 算数忍者〜九九の巻〜完全版: the parameters behind the verdict, then further details
ParameterStroopEffect2算数忍者〜九九の巻〜完全版
Price$2.99 — better$4.99
Positive reviews100.0% of reviews — better0.0% of reviews
Update frequencyEvery 14 monthsEvery 5 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.611.0 — better
Further details — not scored
Size2 MB133 MB
Age rating4+4+
DeveloperYasuyoshi OtaFantamstick

Customer experience

StroopEffect2

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

算数忍者〜九九の巻〜完全版

Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

StroopEffect2

No in-app purchases

None

算数忍者〜九九の巻〜完全版

No in-app purchases

Questions

Is StroopEffect2 free?
StroopEffect2 costs $2.99, with no in-app purchases.
Is 算数忍者〜九九の巻〜完全版 free?
算数忍者〜九九の巻〜完全版 costs $4.99, with no in-app purchases.
Do StroopEffect2 or 算数忍者〜九九の巻〜完全版 have ads?
Neither StroopEffect2 nor 算数忍者〜九九の巻〜完全版 shows ads.
Which is updated more often, StroopEffect2 or 算数忍者〜九九の巻〜完全版?
StroopEffect2 ships an update every 14 months, and 算数忍者〜九九の巻〜完全版 every 5 months. Most recently, StroopEffect2 was updated on September 18, 2026 and 算数忍者〜九九の巻〜完全版 on September 10, 2026.

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