Calculator HD (for iPad) vs Hinge Protractor

Proudly presenting the grand release of "Calculator HD" version 4.0! Support for Split Screen is finally here! In this brand-new version, you can enjoy more convenient operations through Split Screen and Side Over. You can delete accidental input errors by swiping left or right, and you can also copy calculation results or paste calculation data between different apps. There are countless calculator products on the app market, but none achieve such perfection. Optimized for the latest version of iOS, "Calculator HD" brings you a perfect blend of simplicity and ease of use like never before. In the vertical basic mode, you will never accidentally press those large, finger-friendly keys; while the horizontal scientific mode provides you with all the functions you need for your daily calculations—those functions you will actually use, not just decorative embellishments. "Calculator HD" is the perfect replacement for the iPhone calculator, only bigger, clearer, and easier to use. You don't need to spend any time learning how to use it because you are already very familiar with its operation. Happy calculating!

Hinge Protractor for iPhone Duo: Forgot your protractor to school? Want a measure an angle at construction? Tracing a pattern and need a glowing guide line under the paper? Use the app on Duo! On iPhone Duo, it reads the hinge sensor and shows the exact angle between the two screens as you fold. On any other iPhone, the whole screen becomes a ruler at true physical size. FEATURES: - Live angle: Fold or tilt and watch the number follow in real time. - Resizable measurements: Pinch, twist and drag the reading anywhere on screen. - Honest precision: one-time calibration: open and close the hinge slowly, once. - Real-size ruler: Rulers along the screen edges show true physical size in centimetres or inches. Check them against any bank card for perfect accuracy. - Relative measurments: Drag two lines across the screen and read the exact position off both rulers. - Saved measurements: Double-tap to save an angle, a ruler position or both. Add a note, drag to reorder, and undo with one tap. - Configuration: Degrees or radians, centimeters or inches, light or dark theme, in English, Russian or Chinese.