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What changed · US
Listing changes AppTracker has observed for this app in this storefront — new versions, price moves, rating shifts, and store copy.
Aug 27, 2026
New version
1.9.4 → 1.9.5
performance improvement
Screenshots
About
Forget about forgetfulness! Improve your memory! Improve Working Memory using N'Back Butterfly. The n-back task is a continuous performance task that is commonly used as an assessment in cognitive neuroscience to measure a part of working memory. The n-back was introduced by Wayne Kirchner in 1958. [quoted from Wikipedia 2014-04-02]
What's new · 1.9.5
performance improvement
Details
DeveloperYasuyoshi Ota
ReleasedApr 2014
UpdatedOct 2025
Version1.9.5
Size17.3 MB
RequiresiOS 12.0 or later
Age rating4+
LanguagesEnglish, Japanese
PriceFree
Categories
Bundle IDjp.hasshokukou.NBackButterfly