123 Calculator: Reverse Keypad
Phone-Style Calculator
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
A calculator that starts with 1. Switch between phone order and classic order with one tap.
123 Calculator is a focused calculator with a phone-style keypad: 1, 2, and 3 start on top. Tap 1 ⇄ 7 to switch instantly between phone order and traditional calculator order. It includes four-function arithmetic, percentages, decimals, repeated equals, adaptive number display, haptic feedback, and VoiceOver labels. Calculations run locally on your iPhone. No account, network connection, ads, tracking, or permissions required.
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The developer, ZHUO KANG, 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 Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- ZHUO KANG
- Size
- 1.5 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 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 ZHUO KANG