Ten months after release, macOS 26 Tahoe runs on 86.0% of the macOS installs tracked by TelemetryDeck in the week of July 27, 2026, and Sequoia has fallen to 12.2%. This post covers the build-level breakdown, the Tahoe adoption curve against Sequoia’s a year earlier, why StatCounter’s macOS version tables cannot be trusted, and the Mac shipment data feeding the installed base.
MacOS Version Distribution Statistics
macOS Version Distribution by Point Release
Two builds carry most of the platform. macOS 26.5 held 64.94% of tracked installs and 26.6 held 12.33% in the week of July 27, 2026, so the pair covers 77.27% between them.
The only pre-Tahoe build above 2% is macOS 15.7 at 9.23%, the Sequoia security-update branch serving Macs that cannot run Tahoe plus users who deferred. Sonoma’s last top-ten entry, 14.8, sits at 0.80%.
| macOS build | Share of tracked installs | Major release |
|---|---|---|
| macOS 26.5 | 64.94% | Tahoe |
| macOS 26.6 | 12.33% | Tahoe |
| macOS 15.7 | 9.23% | Sequoia |
| macOS 26.4 | 3.94% | Tahoe |
| macOS 26.3 | 3.09% | Tahoe |
| macOS 26.2 | 1.71% | Tahoe |
| macOS 15.6 | 1.63% | Sequoia |
| macOS 15.5 | 1.30% | Sequoia |
| macOS 27.0 (beta) | 1.03% | macOS 27 |
| macOS 14.8 | 0.80% | Sonoma |
Source: TelemetryDeck, week of July 27, 2026
macOS 27.0 registering 1.03% months before public release is developer beta traffic, not consumer adoption.
How Fast Did macOS 26 Tahoe Reach 86%?
Tahoe launched on September 15, 2025 at 39.6% of tracked installs in its first week, a figure lifted by public beta users already on the release. It crossed 50% between mid-October and mid-December 2025.
Sequoia lost 43.1 points across the same ten months, sliding from 55.3% to 12.2%.
| Week of | macOS 26 (Tahoe) | macOS 15 (Sequoia) | macOS 14 (Sonoma) |
|---|---|---|---|
| Sep 15, 2025 | 39.6% | 55.3% | 4.0% |
| Dec 15, 2025 | 58.0% | 38.6% | 2.4% |
| Mar 16, 2026 | 71.1% | 27.5% | 1.4% |
| Jun 15, 2026 | 83.0% | 15.3% | 1.0% |
| Jul 27, 2026 | 86.0% | 12.2% | 0.8% |
Source: calculated from TelemetryDeck weekly point-release data; rows may not total 100% due to rounding and smaller entries outside the top ten
The like-for-like comparison matters more than the headline. In the week of July 28, 2025, roughly the same distance from Sequoia’s September 16, 2024 release, Sequoia held 85.2% against Tahoe’s 86.0% now. macOS version distribution is not accelerating year over year, it is repeating.
ChromeOS runs on a much shorter clock: consumer devices typically land on a new stable build within one to two weeks, per the ChromeOS update cadence figures.
macOS 26.5 Adoption Curve
Point releases turn over in weeks, not quarters. macOS 26.5 went from 14.9% in its May 11, 2026 release week to 46.3% three weeks later, then peaked at 74.1% of tracked installs in the week of July 20.
| Week of | macOS 26.5 share of tracked installs |
|---|---|
| May 11, 2026 | 14.9% |
| May 18, 2026 | 31.4% |
| May 25, 2026 | 46.3% |
| Jun 1, 2026 | 49.1% |
| Jun 22, 2026 | 65.4% |
| Jul 20, 2026 | 74.1% |
| Jul 27, 2026 | 64.9% |
Source: TelemetryDeck; release date per Wikipedia
The 9.2-point fall in the final week is the arrival of macOS 26.6 on July 27, which patched 143 vulnerabilities, the largest security payload of any Tahoe point release, per Tech Times. How well those forced-cadence updates actually install on Google’s platform is covered in the ChromeOS update installation data.
Why StatCounter macOS Version Distribution Data Cannot Be Used
StatCounter’s macOS version table for June 2026 puts macOS Catalina at 47.06% of global desktop pageviews and lists Cheetah, the 2001 release, at 3.09%. Tahoe and Sequoia do not appear anywhere in it.
| macOS version label | Global desktop pageview share, June 2026 |
|---|---|
| macOS Catalina | 47.06% |
| macOS Sierra | 10.54% |
| macOS High Sierra | 5.51% |
| macOS Mojave | 5.38% |
| macOS 19 | 4.8% |
| macOS Cheetah | 3.09% |
Source: StatCounter, June 2026; top six labels shown, remainder spread across older versions
StatCounter states the reason on the chart itself: Apple reports every release since Catalina 10.15 as Catalina, a logged WebKit issue, so usage for Catalina, Big Sur, Monterey, Ventura and Sonoma cannot be separated. Every “macOS Catalina leads with 47%” headline circulating in 2026 traces back to this parsing fault.
macOS Share of the Desktop OS Market
The same reporting fault splits Apple into two platform-level entries. StatCounter listed OS X at 15.16% and macOS at 5.71% of global desktop pageviews in June 2026, 20.87% between them, so neither figure alone represents the platform.
| Platform label | Global desktop pageview share, June 2026 |
|---|---|
| Windows | 72% |
| OS X | 15.16% |
| macOS | 5.71% |
| Linux | 5.59% |
| Chrome OS | 1.54% |
Source: StatCounter, June 2026
Apple’s two labels total close to triple the 7.13% held by Linux and Chrome OS combined. Chrome OS at 1.54% globally understates its US position, where education buying pushes the share several times higher, as the Chromebook user base statistics break down.
Mac Shipments Behind the macOS Installed Base
Apple shipped 6.7 million Macs in Q2 2026, up 10.1% year over year, while worldwide PC shipments fell 4.9% to 68.2 million, per IDC. It was the first quarterly PC decline after nine consecutive quarters of growth, and Apple was the only top-five vendor posting double-digit growth.
| Metric | Q1 2026 | Q2 2026 |
|---|---|---|
| Worldwide PC shipments | 65.6 million | 68.2 million |
| Worldwide PC growth, year over year | +2.5% | −4.9% |
| Mac shipment growth, year over year | +9.1% | +10.1% |
| Apple share of worldwide PC shipments | not reported | 9.9% |
Source: IDC, Q1 and Q2 2026 shipment reports
Apple’s shipment share rose from 8.5% a year earlier to 9.9% on those 6.7 million units. Each machine arrives with Tahoe preinstalled on Apple silicon that updates reliably, which is much of why the newest major version reaches 86% of tracked installs inside a year. Unit-level context against Google’s platform sits in this Chromebook and MacBook shipment comparison.
What macOS 27 and the Intel Cutoff Change for Version Distribution
Apple confirmed at WWDC 2025 that Tahoe is the final macOS release supporting Intel Macs, and that macOS 27 is Apple silicon only, per Computerworld. Four Intel models still run Tahoe: the 2019 Mac Pro, the 2020 27-inch iMac, the 2019 16-inch MacBook Pro, and the 2020 13-inch MacBook Pro with four Thunderbolt 3 ports, per Wikipedia’s macOS Tahoe compatibility list.
Those systems get roughly three years of security updates from Tahoe’s September 2025 launch, running to about autumn 2028, per Tech Times. Tahoe becomes a terminal branch for that part of the base rather than a stepping stone, the same role macOS 15.7 plays today for pre-Tahoe hardware.
Beta uptake is lighter this cycle. macOS 27.0 held 1.03% of tracked installs in the week of July 27, 2026, against 5.4% for the macOS 26.0 beta in the week of July 28, 2025, per TelemetryDeck. Support windows differ sharply across platforms; Google now guarantees ten years of updates on its hardware, detailed in the ChromeOS update reliability data.
How This macOS Version Distribution Data Was Compiled
TelemetryDeck publishes weekly shares for the ten most-used macOS builds, so percentages are of that top-ten total and a thin tail of older releases falls outside it. Its dataset skews toward users of small and independent developers’ apps.
StatCounter measures page views rather than devices, and IDC counts shipments rather than installed base. Major-version rows were calculated by summing published point-release figures for each week; none of the three measurements can be swapped for another.
FAQs
What percentage of Macs run macOS 26 Tahoe in 2026?
Tahoe held 86.0% of macOS installs tracked by TelemetryDeck in the week of July 27, 2026, with macOS 26.5 alone at 64.94% and 26.6 at 12.33%.
Is macOS Catalina really the most used macOS version, as Reddit threads claim?
No. StatCounter shows Catalina at 47.06% in June 2026 only because Apple reports every release since 10.15 as Catalina, a logged WebKit issue. Telemetry puts Tahoe at 86.0% of tracked installs.
Why do Reddit users report seeing macOS Cheetah in 2026 market share charts?
The same StatCounter parsing fault scatters misread user-agent strings across old labels, listing the 2001 Cheetah release at 3.09% in June 2026. It reflects broken version reporting, not actual Cheetah usage.
How fast did macOS 26.5 roll out?
macOS 26.5 went from 14.9% of tracked installs in its May 11, 2026 release week to 46.3% three weeks later, peaking at 74.1% in the week of July 20 before 26.6 arrived.
Which Intel Macs still get macOS updates?
Four models run Tahoe: the 2019 Mac Pro, 2020 27-inch iMac, 2019 16-inch MacBook Pro, and 2020 13-inch MacBook Pro with four Thunderbolt 3 ports, with security updates to about autumn 2028.
Sources
https://telemetrydeck.com/survey/apple/macOS/majorSystemVersions/
https://gs.statcounter.com/os-market-share/desktop/worldwide
