Why iOS Isn’t Open Source: The Secrets Behind Apple’s Walled Garden
Apple launched the iPhone in 2007 with a proprietary OS, later named iOS, tightly integrated with its hardware. The App Store opened in 2008, requiring all apps to pass Apple’s review and use its SDK. Most of iOS remains closed-source, though Apple released the Darwin core and open-sourced Swift in 2015. Under EU rules, iOS 17.4 will allow third-party app stores and sideloading in Europe.