Mobile Apple iOS market share worldwide 2018-2026, by version

Mobile Apple iOS operating system market share worldwide from January 2018 to June 2026, by version

Few companies move their users onto new software as quickly as Apple. Every September a new version of iOS arrives, and within months it becomes the version most iPhones run, while the previous one fades and older releases dwindle to a thin tail. This report tracks Apple iOS market share worldwide by version, month by month, from January 2018 to June 2026, capturing one of the most striking features of the Apple ecosystem: how fast and how uniformly hundreds of millions of devices adopt each new release. No other software platform of comparable size turns over its base so quickly or so completely. The speed is a structural feature of how Apple designs and ships its software.

As of mid-2026, iOS 26, the redesigned version Apple introduced in September 2025 under its new year-based naming, runs on roughly two thirds of active iPhones, with the prior iOS 18 holding most of the rest. That concentration is no accident; it is the product of Apple tight control over its hardware and software. The devices shipping those updates are tracked in our Apple smartphone shipments analysis, and the speed of adoption reflects how new most of that installed base is.

This rapid, uniform adoption stands in sharp contrast to the Android world, where dozens of manufacturers and carriers slow the spread of each new release and fragmentation runs deep. On iOS, by contrast, the two newest versions together almost always account for the vast majority of devices. For developers, this means they can target the latest features quickly; for users, it means a more secure and consistent experience across the platform.

A note on the data matters here. The figures are based on StatCounter web-traffic measurements, the standard public source for operating-system version share. The current distribution reflects actual readings, while the monthly history is modelled on Apple well documented adoption pattern and published snapshots. The result is a faithful picture of how iOS versions rise and fall, even where exact month-by-month values are estimates. The money behind these devices appears in our Apple iPhone revenue analysis.

Apple iOS Major Versions: Launch, Peak, Reign and Current Share

The table summarises each major iOS version from iOS 11 to iOS 26, showing the year it launched, the peak share it reached, how many months it spent as the single most-used version, and its share as of June 2026. The pattern is remarkably consistent: most versions peak around 80 percent and reign for about a year before the next release takes over. The exception is iOS 26, whose slower start tells its own story. Sorting the columns reveals just how uniform Apple update cycle has been. The lone outlier in the table is the one that reveals the most about user behaviour. A single slow year stands out precisely because every other year was so uniform. The table rewards a second look precisely because the pattern is so steady.

Two Versions, Most of the Base

As of June 2026, the iOS landscape is dominated by two versions. iOS 26, launched the previous September, runs on roughly two thirds of active iPhones, while iOS 18, the prior year release, holds close to a fifth. Everything older, iOS 17 and back, together makes up only a small remainder, scattered across devices that cannot or have not updated. This is the characteristic shape of the iOS installed base at almost any moment: one dominant version, one substantial runner-up, and a thin tail. No other major operating system maintains so concentrated a version profile. The shape barely changes from month to month, only the version names do.

That a year-old version still holds nearly a fifth of devices reflects iOS 26 unusually slow start, not a failure of adoption. In a typical year the newest version would already command three quarters or more of the base by this point. The redesign at the heart of iOS 26 gave some users pause, a dynamic that affects how Apple monetises its ecosystem, explored in our iPhone share of Apple revenue analysis, where software engagement underpins services growth.

Even so, the concentration is extraordinary by the standards of any other platform. The newest two versions of iOS together account for the overwhelming majority of devices, leaving older releases with negligible share within a year or two of being superseded. For a platform spanning more than a billion active devices worldwide, this degree of uniformity in software versions is something no rival ecosystem comes close to matching.

The Low-Fragmentation Signature

One of the clearest ways to see iOS low fragmentation is to track the combined share of the two newest versions over time. That figure almost never falls below about 85 percent and frequently sits above 90, meaning the overwhelming majority of iPhones run either the current release or the one immediately before it. The line stays remarkably high and stable across the entire period, year after year. The line barely wavers, even as the underlying versions cycle through completely. Newcomers replace incumbents without the combined total ever dipping much.

This is the metric that most distinguishes iOS from Android. On Android, the two newest versions might together account for only a minority of devices, with the rest spread across a long tail of older releases held back by manufacturers and carriers. The contrast is stark in our smartphone market share by vendor analysis, where the sheer number of Android makers explains why their update picture is so much more fragmented than Apple.

The practical consequences are large. Because almost every active iPhone runs a recent version, Apple can roll out new features, security fixes and privacy changes to nearly its entire base within months. Developers can adopt the latest tools without stranding users, and the platform stays coherent. This software uniformity is one of the quiet advantages that makes the iPhone ecosystem so durable and so profitable.

How Fast Each Version Spread

Comparing how quickly each version reached a given share after launch reveals Apple consistent adoption engine, and the one recent exception to it. For years, each new iOS release climbed to roughly two thirds of devices within about six months of its September debut, a pace few software platforms can match. The bars for iOS 12 through iOS 18 are strikingly similar, a sign of how reliable the cycle had become. For years, Apple adoption looked less like a rollout and more like a switch being flipped. Users simply moved, in their hundreds of millions, almost on schedule. That predictability let Apple plan features years ahead with real confidence.

Then came iOS 26. Six months after its launch it had reached only about forty percent of devices, far below the pace of its predecessors. The redesigned interface, and some user reluctance to change, slowed the rollout in a way Apple had not seen in years. This unusual hesitancy is worth watching, as it touches the broader smartphone upgrade cycle tracked in our global smartphone shipments analysis, where slower software adoption can hint at slower hardware refresh.

Even iOS 26 slower pace, however, would count as fast adoption on any other platform. Reaching forty percent of an entire global installed base within six months is something Android versions rarely approach. The episode is a reminder that Apple adoption advantage is so large that even a disappointing year still outpaces the competition, while underlining how much a major redesign can affect user behaviour. Even a stumble, by Apple standards, would be a triumph for almost anyone else. The bar for disappointment at Apple is set higher than most rivals ever reach. Context matters: even Apple weakest adoption year embarrasses the competition. That gap has persisted for the better part of a decade.

The Ceiling of iOS Adoption

The peak share each version reaches tells a consistent story. Most major iOS releases climb to around eighty percent of devices at their height, typically in the summer before the next version launches, when the current release has had nearly a full year to spread. The peaks are remarkably uniform, clustering in a narrow band that reflects Apple steady, predictable update cadence. The narrow band of peaks is itself a kind of corporate signature. The ceiling has held steady through nearly a decade of releases.

The versions that fall short of that band are instructive. iOS 26 had not yet peaked by mid-2026, still climbing toward its eventual high, while the very oldest version in the window was already past its prime when the period began. These peaks sit atop a vast and valuable installed base, the same base that drives the revenue detailed in our Apple total revenue analysis, where engaged, up-to-date users spend more.

What the peaks reveal is the ceiling of iOS adoption: not quite one hundred percent, because a small share of devices always lag on older versions, whether for compatibility, habit or hardware limits. But a peak near eighty percent for a single software version, across more than a billion devices, is a concentration of users that no other operating system achieves, and it underpins the coherence of the whole platform.

The Slowest Changeover in Years

The most recent transition, from iOS 18 to iOS 26, is worth examining closely because it broke the usual pattern. In a typical year the new version overtakes its predecessor within a couple of months of launch. This time, iOS 18 clung to the lead well into the winter, and iOS 26 took far longer than usual to pull ahead, reflecting genuine user hesitation about the redesign. The usual quick handover became, for once, a drawn-out contest.

Tracking the two lines as they cross shows the slowest changeover in recent iOS history. iOS 26 rise was gradual through late 2025 before accelerating in 2026, while iOS 18 decline was correspondingly drawn out. The pattern echoes the way product cycles shape Apple results across categories, visible in our Apple revenue by segment analysis, where a single product or release can move the numbers for quarters.

By mid-2026 iOS 26 had firmly taken the lead, but the transition left a larger-than-usual share of devices on the older version. Whether this reflects a one-off reaction to a bold redesign or a new, more cautious upgrade behaviour among iPhone users will only become clear with the next release. Either way, the iOS 18 to iOS 26 handover stands out as an unusual chapter in an otherwise metronomic update history. It is the rare moment when Apple rhythm visibly faltered. Whether it was a one-off or a turning point remains an open question.

Few Versions in Real Use

Fragmentation, the number of versions in meaningful use at once, is the measure on which iOS most clearly outshines its rivals. At any given month, only a handful of iOS versions hold more than a sliver of the market, typically just two or three with any real presence. The count stays low and stable across the entire period, a visual signature of a tightly managed platform. Where rivals show a long tail of versions, iOS shows a short, sharp spike. That spike is the visual proof of a platform under firm central control. The contrast with Android sprawling version map could hardly be sharper.

This low fragmentation is a direct result of Apple control over both hardware and software, and of its long support windows that keep even older iPhones eligible for new releases. The contrast with the wider device market is sharp; the revenue that flows from this coherent ecosystem is mapped in our worldwide smartphone market revenue analysis, where Apple captures a disproportionate share of industry value.

For everyone who builds on iOS, low fragmentation is a gift. It means fewer versions to test against, faster feature rollout, and a more secure base overall, since security patches reach nearly everyone quickly. It is one of the least visible but most important reasons the iPhone has remained such an attractive platform for developers and such a safe one for users over so many years. Low fragmentation quietly protects hundreds of millions of devices at once. Security updates reach almost everyone, almost immediately, by default. That blanket coverage is among the platform most underrated strengths.

The Annual Rhythm

How long each version spends as the single most-used release is another window into Apple cadence. For most of the period, each version reigned for almost exactly twelve months, from its autumn launch until the next September, when its successor took over. This near perfect annual rhythm is one of the most regular patterns in all of consumer technology. You could almost set a calendar by the annual changing of the guard. That dependability is rare enough in technology to be worth pausing on. Few companies anywhere run a release cycle this disciplined. The result is a platform that feels coherent to everyone who touches it. That coherence is one of Apple quiet competitive moats.

The exceptions prove the rule. iOS 18 reigned noticeably longer than a year, because its successor iOS 26 was so slow to overtake it, while iOS 26 itself had held the top spot only briefly by mid-2026. The discipline behind this cadence reflects the scale of Apple operation, including the workforce that builds and ships each release, detailed in our Apple employee count analysis.

The regularity of these reigns is what makes the iOS version landscape so predictable. Unlike platforms where a popular version can linger for years, iOS turns over on a dependable annual schedule, with each release ceding the lead to the next almost on cue. That predictability is valuable to everyone in the ecosystem, from Apple itself to the millions of developers who plan their work around it. Predictability, in this case, is itself a feature of the platform.

The Version Mix Each June

Taking a snapshot of the version mix each June, across the years, distils the whole story into a series of stacked columns. In every year, one version dominates while the previous one holds a meaningful slice and older releases shrink to a thin band at the edge. The columns look strikingly similar from year to year, a testament to how consistent the adoption cycle has been. Each column is a near-replica of the last, save for the version names. Read top to bottom, the snapshots are the smartphone era in miniature. Each band marks another generation of devices and another wave of upgrades. The story repeats, year after year, with almost mechanical regularity.

Reading the snapshots in sequence shows the relentless march of versions: iOS 11 gives way to 12, then 13, 14, 15, 16, 17, 18 and finally 26, each occupying the dominant band in turn. The only visible break in the rhythm is the most recent year, where iOS 26 slower rise left iOS 18 with an unusually large share. This concentration of value sits among the assets explored in our most valuable companies analysis.

The yearly snapshots also make clear how quickly old versions vanish. A release that dominates one June is typically a minor footnote two Junes later, pushed aside by two newer generations. This swift turnover keeps the iOS base modern and secure, and it is one of the reasons the platform avoids the long, insecure tails of outdated software that plague more fragmented ecosystems. Old iOS versions do not linger; they are swept aside within a year or two.

Months Since Launch, Compared

Plotting each version share against the number of months since its launch overlays the adoption curves directly, making their shapes easy to compare. For iOS 16, 17 and 18, the curves are almost identical: a steep climb over the first half-year to around two thirds of devices, then a gentler rise toward a peak before the next launch. The consistency is the clearest sign of Apple finely tuned update machine. When the curves overlap this neatly, the precision is unmistakable.

Against those near-identical curves, iOS 26 stands apart. Its line climbs more slowly and stays below its predecessors for months, the clearest single illustration of its sluggish start. The gap between iOS 26 curve and the others is a measure of how much the redesign affected behaviour, in a way that ripples through the broader digital economy charted in our internet and platform companies revenue analysis.

Adoption curves like these are more than a curiosity; they shape how Apple plans features, how developers schedule support, and how security teams gauge exposure. The fact that iOS curves are usually so predictable is itself a strategic asset, and the rare deviation of iOS 26 is a useful warning that even the most reliable patterns can shift when a company asks its users to embrace a dramatic change. The curve for iOS 26 is, in effect, a record of that hesitation.

Across more than eight years, Apple iOS has shown a pattern of adoption that no rival platform can match: each new version sweeping across hundreds of millions of devices within months, the two newest releases almost always covering the vast majority of the base, and old versions fading on a dependable annual schedule. The version-share data is, in effect, a portrait of the most tightly managed software ecosystem in the world, one that turns over its entire installed base with remarkable speed and uniformity. No competitor has built anything quite like it.

The story is not entirely static, however. The unusually slow adoption of iOS 26, slowed by a bold redesign, is a reminder that even Apple cannot take user behaviour for granted, and that a single controversial change can disrupt a rhythm built over years. Whether the next release restores the old cadence or confirms a more cautious mood among iPhone owners, the iOS version landscape will remain one of the most revealing windows into how Apple manages, and depends upon, its vast and loyal user base. How that base responds to the next release will be telling.

Frequently Asked Questions: Apple iOS Versions