Apple has shared the first details on user adoption of iOS 18 so far. The company says that iOS 18 is currently installed on 68% of all iPhones and on 76% of iPhones introduced in the last four years. These numbers show that iOS 18 adoption is on the same trajectory as iOS 17 adoption last year. These numbers are measured by the devices that transacted on the App Store on January 21, 2025. The information was published on Apples Developer website today.iOS 18 adoptionOf devices introduced in the last four yearsiOS 18: 76%iOS 17: 19%Earlier: 5%Of all devicesiOS 18: 68%iOS 17: 19%Earlier: 13%iPadOS 18 adoptionOf devices introduced in the last four yearsiPadOS 18: 63%iPadOS 17: 27%Earlier: 10%Of all devicesiPadOS 18: 53%iPadOS 17: 28%Earlier: 19%More details iOS 18 is supported by the same iPhone models as iOS 17, dating back to the iPhone XS that was released in 2018. Apples long-term support for iPhone models ensures that users are getting access to as many new features as possible along with important security improvements and bug fixes. In recent years, Apple has also made it easier for users to stay on their current version of iOS if they arent quite ready to make the jump to the next major release. For example, when Apple released iOS 18 in September, it also released iOS 17.7. iPhone users were given a choice between updating to iOS 18 to access all the updates new features or update to iOS 17.7. If users chose to update to iOS 17.7, they could avoid any potential bugs that come with a major new iOS release while simultaneously getting all of the important security fixes and other improvements. Most recently, Apple released iOS 17.7.2 and iPadOS 17.7.2 in November with important security fixes. Again, this ensures that users have the most secure experience possible even if theyve chosen not to update to iOS 18. Have you updated your iPhone to iOS 18 or is there a particular reason youre still holding out? Let us know down in the comments. My favorite iPhone 16 accessories:Add 9to5Mac to your Google News feed. FTC: We use income earning auto affiliate links. More.Youre reading 9to5Mac experts who break news about Apple and its surrounding ecosystem, day after day. Be sure to check out our homepage for all the latest news, and follow 9to5Mac on Twitter, Facebook, and LinkedIn to stay in the loop. Dont know where to start? Check out our exclusive stories, reviews, how-tos, and subscribe to our YouTube channel