CalculateRetro is a top-notch calculator app designed for iPad, iPhone, iTouch, and Apple Watch. It offers a plethora of features that make it stand out from traditional calculators. With the ability to print out or email your calculations, it ensures you never lose your train of thought mid-calculation. The app supports dark mode, allows correction with a backspace key, and offers multiple customization options for backgrounds, fonts, and more.

One of the distinctive features of CalculateRetro is its Apple Watch calculator integration, enabling quick calculations on the go. It also includes an Extension for Today View, facilitating swift calculations that can be copied to the app. The app's ability to email, print, or PDF calculation history adds a practical touch to its functionality.