prototype designs, conceived an application called The Steve Jobs Roll Your Own Calculator Construction Set that allowed Jobs to tailor the look of the calculator to his liking. Its design was maintained with the same basic math operations until the final release of classic Mac OS in 2001. The app's absence on the iPad The Calculator app is not available on any of Apple's iPad devices. This is the result of a misunderstanding during the iPad's software development between Steve Jobs and Scott Forstall, Apple's software chief at the time. Forstall thought that he should just scale the iPhone Calculator app to fit the iPad proportions. One month before the first-generation iPad's release, Jobs asked him about the new Calculator design adapted for the iPad, which had not been developed. He was dissatisfied with the app, saying it "looks awful", and eventually prohibited it from being released. , Apple has not released an official calculator app for the iPad because its development has been a low priority at the company since then. In a 2020 interview, American tech YouTuber Marques Brownlee (or MKBHD) asked Craig Federighi why the iPad still does not have a default calculator app, and he said, "That day may come." References Classic Mac OS software macOS software macOS iOS IOS-based software made by Apple Inc. Software calculators Mathematical software