Binary Hands: Count in Binary
Ten fingers, ten bits
$0.99 · Designed for iPad. Not verified for macOS.
See binary with your hands. Left thumb is 512, right thumb is 1.
No ads, no tracking, no internet. One-time purchase.
Fold your ten fingers and binary numbers become something you can see.
Your left thumb is 512. Your right thumb is 1. Each finger is one bit,
so the weights of the folded fingers add up to any number from 0 to 1023.
The 10-digit binary readout and the decimal value move together, which is
why 1000011 stops being something to memorize and starts being a shape
your hands can make.
WHAT YOU CAN DO
- Tap a finger to fold or extend it. The total updates instantly
- 10-bit binary readout. Bits that turn to 1 light up in yellow
- Every bit weight is always on screen (512, 256, 128 ... 2, 1)
- The value is read aloud in English or Japanese
- Switch between "folded = 1" and "extended = 1" to suit how you teach
- Switch between English and Japanese
- Reset button returns everything to zero
WHO IT IS FOR
- Students meeting binary for the first time
- Anyone who got stuck on base conversion while studying for an IT exam
- Teachers and parents explaining binary to someone else
- Beginning programmers who cannot quite picture bitwise operations
NO ADS, NO PURCHASES
This is a one-time purchase. There are no ads and no in-app purchases.
The app never connects to the internet, so it works in airplane mode.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Yoshihide Maehama, 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 Not Linked to You
The following data may be collected but it is not linked to your identity:
- Location
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Yoshihide Maehama
- Size
- 24.3 MB
- Category
- Education
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPad
Requires iPadOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Yoshihide Maehama
