The iPhone Duo simulator has now been made available in Xcode 27.1, and it’s quite the experience. Despite a few quirks here and there (this is beta software as of today), it runs relatively smoothly, and does everything we need it to do to test our apps and get them ready for this new and exciting form factor. I’ve had a chance to put it through its paces, all six layouts, including portrait and landscape, for closed, half-open and fully open, with some recent business apps,

Apple's "27" releases look like a quiet year: maintenance updates focused on speed, efficiency and reliability rather than headline UI. But there's a catch buried in the notes. Once you move to macOS 27, the old Xcode 26 no longer runs — and the Liquid Glass migration you've been putting off comes firmly into focus. Our first look at the betas and what they actually mean for your app.

An app isn't really a finished object — it's more of a living one. It can be working perfectly while the world around it keeps moving: iOS updates, App Store rules, and the third-party libraries it's built on all carry on evolving on their own timetables. “It still works” tells you about today; it doesn't tell you how well the app is keeping pace underneath.