Apple is preparing one of the most dramatic software overhauls in the company’s history. The revamp — due later this year — will fundamentally change the look of the operating systems. Apple is betting that a breakthrough new interface can help spur demand after a sluggish stretch. The software will mark the most significant upgrade to the Mac since the Big Sur operating system in 2020. For the iPhone, it will be the biggest revamp since iOS 7 in 2013. The changes are coming as part of iOS 19 and iPadOS 19 — code-named “Luck” — and macOS 16, which is dubbed “Cheer.” They go well beyond a new design language and aesthetic tweaks. They also include updating the style of icons, menus, apps, windows and system buttons. The design is loosely based on the Vision Pro’s software, they said. The company is stopping short of merging its operating systems — a step other tech giants have taken. It believes it can make better Macs and iPads by keeping their operating systems separate. Another benefit for Apple is it encourages consumers to buy both devices, rather than getting by with one.