Dentaku: Musical Calculator

200+ Tones, Piano & RPN Calc

Free

In 1981, the German music group Kraftwerk released a song performed on a calculator. The title of the song is "Pocket Calculator" and the Japanese version is titled "Dentaku" (which means calculator in Japanese). At the time, Japanese calculators were at the peak of their evolution, and it was not uncommon to find models with musical scales assigned to each button, allowing users to play music. I created this app to celebrate those nostalgia-filled days and to bring a little joy to daily calculation tasks. This app is designed not only as a practical tool but as an experience to be enjoyed through the senses. Features: • A musical scale is assigned to each button and even between buttons, producing beautiful sounds as you operate it. You can select from 200 different tones. • The position of the notes can be easily checked using the "Show Musical Scale" option. (C, C#, D, D#, E, F, F#, G, G#, A, A#, B...) • Choose your favorite background color. The color changes dynamically based on your tapping speed and gradually returns to the base color when you stop. The transition depends on the original color; for example, a blue background will take on a reddish tint as you tap repeatedly. • In "Auto Mode," the background color and tone change randomly, keeping every calculation fresh and exciting. • Save your favorite combinations of tone and color as "My Themes" to recall them at any time. • While basic functions are based on the standard iOS calculator, unique refinements have been added. • By default, it uses "Order of Operations" (PEMDAS). When turned off, it behaves like a standard Japanese business calculator. • Includes an RPN (Reverse Polish Notation) mode. This is a classic fixed-stack specification reminiscent of HP's 4-level RPN, with a customizable stack depth of 4 to 8 levels. • Supports localized number formats (commas and periods) for various countries.

Ratings & Reviews

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• Added a new keymap (Type 2) where the interval between every other row is exactly one octave. The traditional keymap (Type 1) can also be selected. • The software libraries used in this app have been updated.

Version 1.2.11

The developer, Shinji Koki, 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
  • Shinji Koki
Size
  • 26.2 MB
Category
  • Utilities
Compatibility
Requires iOS 15.0 or later.
  • iPhone
    Requires iOS 15.0 or later.
  • iPad
    Requires iPadOS 15.0 or later.
  • iPod touch
    Requires iOS 15.0 or later.
  • Apple Vision
    Requires visionOS 1.0 or later.
Languages
English and 9 more
  • English, French, German, Italian, Japanese, Korean, Portuguese, Simplified Chinese, Spanish, Traditional Chinese
Age Rating
4+
Copyright
  • © Shinji Koki
  • Developer Website
  • Privacy Policy

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