N-Back Training

Daily Brain Training in 5 Min

Free · In-App Purchases · Designed for iPad

I wanted to play "Oni Keisan" on my iPhone! That's why I created this N-Back brain training app. What is this training? Solve calculations while remembering the answers from a few questions back. Juggling "memorizing" and "calculating" at the same time gives your brain a real workout. Features ◆ Two Input Modes - Tap Mode: Quickly tap the answer - Handwriting Mode: Write numbers directly ◆ Build Daily Habits - Set daily play goals - Track your streak - Record how you're feeling today ◆ Track Your Progress - Accuracy trends - Level-up history - Play history ◆ Customize Your Way - Adjust question count & time limits - 3 color themes - iPhone & iPad support Perfect For - Those who want to play Oni Keisan without a dedicated game console - Anyone looking for a quick mental exercise - People who want to build a daily habit Just 5 minutes a day. A casual brain training experience.

Ratings & Reviews

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ver3.1.1 - dark mode - fix layout

Version 3.1.1

The developer, chunson yamada, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Used to Track You

    The following data may be used to track you across apps and websites owned by other companies:

    • Location
    • Identifiers
    • Usage Data
    • Diagnostics

  • Data Linked to You

    The following data may be collected and linked to your identity:

    • Location
    • Identifiers
    • Usage Data
    • Diagnostics

Privacy practices may vary based, for example, on the features you use or your age. Learn More

Accessibility

The developer has not yet indicated which accessibility features this app supports. Learn More

Information

  • Provider
    • chunson yamada
  • Size
    • 22.3 MB
  • Category
    • Education
  • Compatibility
    Requires iOS 26.0 or later.
    • iPhone
      Requires iOS 26.0 or later.
    • iPad
      Requires iPadOS 26.0 or later.
    • Mac
      Requires macOS 26.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 26.0 or later.
  • Languages
    • English and Japanese
  • Age Rating
    4+
    • 4+
    • Learn More
    • Infrequent
      Contests

      Contains
      Gambling and Contests
      Advertising
  • In-App Purchases
    Yes
  • Copyright
    • © 2025 ch yamada
  • Developer Website
  • Privacy Policy
  • Licence Agreement

    • Supports

    • Game Center

      Discover new games and play with friends. This game also features leaderboards.

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