Apple's fresh App Store transaction data shows iOS 26 running on 86% of iPhones released in the past four years, a healthy jump since February but a couple of points short of where iOS 18 sat at the same point last year. The numbers say a lot about how Apple's update machine actually works.
Apple has refreshed its iOS and iPadOS adoption figures ahead of WWDC season, and the picture is familiar: strong uptake, steady growth, and a slight gap behind last year's release at the same stage. The data comes from devices that transacted on the App Store on June 7, 2026, which is Apple's standard methodology for these snapshots and a reasonably reliable proxy for active, engaged users rather than dormant hardware.
What the numbers actually say
Apple splits its reporting into two buckets, and the distinction matters more than it looks. The first bucket counts only iPhones introduced in the last four years. The second counts every iPhone in use that is capable of running the current OS, including older but still-supported models.
For iPhones from the last four years:
- 86% are running iOS 26
- 11% are running iOS 18
- 3% are running something older
For all iOS 26-compatible iPhones:
- 79% are running iOS 26
- 14% are running iOS 18
- 7% are running earlier versions
The iPad story tracks lower, as it always does. On iPads introduced in the last four years, 79% are on iPadOS 26, 16% remain on iPadOS 18, and 5% sit on older builds. Across all iPadOS 26-compatible models, the current version reaches 68%, with 17% on iPadOS 18 and a notable 15% still on earlier releases.
That 15% tail on older iPads is the most interesting figure here. iPads tend to live longer in households as shared or secondary devices, often used by people who never think to update them, which is why iPad adoption curves consistently trail iPhone curves by a wide margin.
Growth since February
Compared with Apple's February data, the momentum is clear. iOS 26 adoption grew 12% on recent iPhones and 13% across all compatible iPhones. iPadOS 26 climbed 13% and 11% respectively. That is exactly the shape you expect from an OS that launched the previous autumn: a fast initial surge, then a long, gradual climb as holdouts eventually tap the update button or buy new hardware that ships with the latest version preinstalled.
The comparison that gets attention
The headline framing every year is how the current release stacks up against its predecessor. Here, iOS 26 and iPadOS 26 both sit 2% behind where iOS 18 and iPadOS 18 were last June for devices from the last four years, and 3% behind overall.
A two or three point gap sounds like a stumble, but it rarely reflects one. Adoption pace is shaped by factors that have little to do with whether the software is good: the number of supported devices being dropped or added in a given cycle, how aggressively Apple prompts users to update, regional differences in device replacement rates, and whether a release carried a marquee feature that pushed people to upgrade early. A version that drops support for a popular older model, for instance, can shift these percentages without any change in user behavior.
Why these figures matter beyond trivia
For developers, this is the data that decides which APIs they can safely require. When the current OS reaches the high 70s and 80s on active devices within a year, it becomes practical to set a higher minimum deployment target and drop compatibility code for older systems. Apple's tight adoption curves are a genuine competitive advantage here. The Android world, fragmented across manufacturers and carriers that control update timing, has never come close to this kind of concentration, which is part of why iOS developers can adopt new platform features so quickly after announcement.
The ecosystem lock-in angle is real too. Fast, near-universal updates keep the entire iPhone base on a narrow band of OS versions, which simplifies support, security patching, and feature rollout. It also means a feature announced at WWDC can realistically reach most users within a year, something Apple leans on heavily when pitching new capabilities to both customers and developers.
Apple publishes the full breakdown on its App Store support page for developers, which is updated periodically and worth bookmarking if you build for the platform. With WWDC and the next version of iOS now on the horizon, these iOS 26 numbers represent the high-water mark before the cycle resets and a fresh adoption race begins.
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