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Release record

macOS 10.12

Sierra

Full article
Public release
Recorded milestones
10
Beta cycle
99d
Average interval
11d
Public release
Sep 20, 2016

Release notes

Overview

Editorial synthesis with inline references and a source ledger when citations are available.

Release overview

macOS Sierra 10.12 launched on September 20, 2016 with Siri on Mac, cross-device clipboard and file workflows, Apple Watch-based unlocking, Apple Pay on the web, major Photos and Messages changes, broader window and video controls, storage management, an updated Apple Music experience, and a new security baseline.[1][2]

Evidence boundary

This page describes only the existing macOS 10.12 launch route. It does not project additions or fixes from 10.12.1 or 10.12.2 backward, and it retains Apple's original device, region, language, authentication, and service qualifications.[3][4]

Source ledger

References

Sources are linked to the claims they support. Publication and access dates are shown when available.

  1. About the security content of macOS Sierra 10.12

    Apple Support · Apple · 2016-09-20T00:00:00.000Z · Released September 20, 2016

    Back to text ↑
  2. macOS Sierra now available as a free update

    Apple Newsroom · Apple · 2016-09-20T00:00:00.000Z · September 20, 2016; Availability; feature sections

    Back to text ↑
  3. macOS Sierra now available as a free update

    Apple Newsroom · Apple · 2016-09-20T00:00:00.000Z · Availability; feature qualifications

    Back to text ↑
  4. Apple security updates (2016 to 2017)

    Apple Support · Apple · 2023-11-06T00:00:00.000Z · macOS Sierra 10.12 through macOS Sierra 10.12.2

    Back to text ↑
  5. macOS Sierra now available as a free update

    Apple Newsroom · Apple · 2016-09-20T00:00:00.000Z · September 20, 2016; Availability

Documented & observed

Changes in this version

Source-linked features, fixes, known issues, removals, and community-observed behavior recorded across this version’s appearances and verified builds.

Release changes

Changed in this release

Features, fixes, removals, and regressions first observed in this release record.

security · fixed

Sierra 10.12 security repairs

documentedconfirmed

Apple's advisory records a broad platform security baseline, including memory-safety, privilege, information-disclosure, validation, and code-execution remediations.

Recorded at Public

  1. [1] About the security content of macOS Sierra 10.12 · apache through WebKit security content; Released September 20, 2016

enhancement · changed

Photos Memories, visual search, and Brilliance

documentedconfirmed

The app could assemble occasion-based collections, identify people, objects, and scenes for search, and rebalance dark areas and highlights with a new editing tool.

Recorded at Public

  1. [1] macOS Sierra now available as a free update · Photos; Memories; Brilliance

feature · introduced

Apple Pay on the web

documentedconfirmed

Participating websites gained an Apple Pay path that handed purchase authorization to a nearby supported device while keeping card details from merchants.

Recorded at Public

  1. [1] macOS Sierra now available as a free update · Apple Pay on the web

enhancement · changed

Updated Apple Music in iTunes

documentedconfirmed

The music service's Mac interface received a clearer discovery-oriented presentation within iTunes.

Recorded at Public

  1. [1] macOS Sierra now available as a free update · Other great new features — Apple Music

feature · introduced

Universal Clipboard

documentedconfirmed

The release added a continuity workflow for moving copied content between nearby supported Apple devices without a separate transfer step.

Recorded at Public

  1. [1] macOS Sierra now available as a free update · Universal Clipboard

enhancement · changed

Richer Messages conversations

documentedconfirmed

Sierra made linked content playable in place and added lightweight reactions and more prominent emoji presentation.

Recorded at Public

  1. [1] macOS Sierra now available as a free update · Other great new features — Messages

feature · introduced

Tabs across multiwindow apps

documentedconfirmed

Maps, Mail, iWork apps, TextEdit, and compatible third-party software could consolidate related windows into a tabbed interface.

Recorded at Public

  1. [1] macOS Sierra now available as a free update · Other great new features — Tabs

feature · introduced

Picture in Picture video

documentedconfirmed

The system added a persistent small-player workflow for watching supported video while working in other applications.

Recorded at Public

  1. [1] macOS Sierra now available as a free update · Other great new features — Picture in Picture

feature · introduced

iCloud Desktop and Documents

documentedconfirmed

Sierra expanded iCloud Drive into the Mac's two common file locations so their contents could follow a user across supported devices.

Recorded at Public

  1. [1] macOS Sierra now available as a free update · iCloud Desktop and Documents

feature · introduced

Optimized Storage

documentedconfirmed

Sierra added system storage-management tools intended to reclaim local capacity when a Mac began running low on space.

Recorded at Public

  1. [1] macOS Sierra now available as a free update · Other great new features — Optimized Storage

compatibility · changed

Late-2009-and-newer Mac baseline

documentedconfirmed

The launch announcement defined the broad hardware generation boundary for the free update while noting that individual features could vary.

Recorded at Public

  1. [1] macOS Sierra now available as a free update · Availability

feature · introduced

Siri on Mac

documentedconfirmed

Users could ask Siri to send messages or email, locate documents and photos, retrieve information, change settings, and place results into documents or the Today view.

Recorded at Public

  1. [1] macOS Sierra now available as a free update · Siri Comes to Mac; Siri on the Mac

Milestones

Release history

Every recorded channel appearance in chronological order. Open an appearance for any available build, scope, notes, and sources.

  2. +22 days
  3. +13 days
  4. +14 days
  5. +8 days
  6. +6 days
  7. +7 days
  8. +7 days
  9. +9 days
  10. +13 days

    Public release

    Public

    Full articleEditorially verified

    macOS Sierra 10.12 reached the public channel on September 20, 2016 with voice assistance, continuity, identity, payments, media, productivity, storage, compatibility, and security changes.

    Availability
    available
    Sources
    17 linked
    Open this appearance

Historical context

Cycle comparison

Pace, intervals, and duration compared with earlier releases on the same platform.

Cycle vs. platform average

99d (avg: 104d)

5 days shorter than the macOS average

Longest gap in this cycle

22 days

Between Beta 1 and Beta 2

Official release notes