macOS Big Sur

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macOS Big Sur
A version of the macOS operating system
macOS Big Sur wordmark
MacOS Big Sur Desktop.png
macOS Big Sur's desktop in "light appearance"
DeveloperApple Inc.
OS family
Source modelClosed, with open source components
November 12, 2020; 12 months ago (2020-11-12)[1]
Latest release11.6.1[2] (20G224)[3] (October 25, 2021; 39 days ago (2021-10-25)) [±]
Update methodSoftware Update
Platformsx86-64, ARM64[4]
Kernel typeHybrid (XNU)
LicenseProprietary software with open-source components
Preceded bymacOS Catalina
Succeeded bymacOS Monterey
Official at the Wayback Machine (archived 2021-10-18)
Support status

macOS Big Sur (version 11) is the seventeenth major release of macOS, Apple Inc.'s operating system for Macintosh computers. It was announced at Apple's Worldwide Developers Conference (WWDC) on June 22, 2020,[5] and was released to the public on November 12, 2020.[6][5][7]

Big Sur is the successor to macOS Catalina, and was succeeded by macOS Monterey, which was released on October 25, 2021.

Most notably, macOS Big Sur features a user interface redesign that features new blurs to establish a visual hierarchy and also includes a revamp of the Time Machine backup mechanism, among other changes. It is also the first macOS version to support Macs with ARM-based processors. To mark the transition, the operating system's major version number was incremented, for the first time since 2000, from 10 to 11.[8][9] The operating system is named after the coastal region of Big Sur in the Central Coast of California.

Development history[edit]

Providing some indication as to how the pre-release operating system may have been viewed internally at Apple during its development cycle, documentation accompanying the initial beta release of macOS Big Sur referred to its version as "10.16", and when upgrading from prior versions of macOS using the Software Update mechanism to early beta releases, the version referred to was "10.16".[10] An exception to this was the Developer Transition Kit, which always reported the system version as "11.0".[10] macOS Big Sur started reporting the system version as "11.0" on all Macs as of the third beta release.

To maintain backwards compatibility, macOS Big Sur identified itself as 10.16 to software and in the browser user agent.[11]

System requirements[edit]

Unlike macOS Catalina, which supported every standard configuration Mac that Mojave supported, Big Sur drops support for various Macs released in 2012 and 2013. Big Sur runs on the following Macs:[12]



macOS Big Sur refreshes the design of the user interface, described by Apple as the biggest change since the introduction of Mac OS X.[6] Its changes include translucency in various places, a new abstract wallpaper for the first time and a new color palette. All standard apps, as well as the Dock and the Menu Bar, are redesigned and streamlined, and their icons now have rounded-square shapes like iOS and iPadOS apps.[14] Compared to iOS, Big Sur's icons include more shading and highlights to give a three-dimensional appearance. Its aesthetic has been described as "neumorphism", a portmanteau of new and skeuomorphism.[15][16] System sounds are redone as well.

The new OS also brings further integration with Apple's SF Symbols, enabling easier use by third-party developers as UI elements for their applications through AppKit, SwiftUI, and Catalyst, which makes it possible to unify third party applications with the existing Apple-made design language.[17]


Control Center[edit]

An interface with quick toggles for Wi-Fi, Bluetooth, screen brightness and system volume has been added to the menu bar.[14] This interface is functionally and visually similar to Control Center on iOS and iPadOS.

Notification Center[edit]

The Notification Center is redesigned, featuring interactive notifications and a transparent user interface. Notification Center also features a new widget system similar to that in iOS 14, displaying more information with more customization than previously available.[6]


Support for Apple silicon[edit]

macOS Big Sur is the first release of macOS for Macs powered by Apple-designed ARM64-based processors, a key part of the transition from Intel x86-64-based processors.[18] The chip mentioned in demo videos, and used in the Developer Transition Kit, is the A12Z Bionic. On November 10, 2020, Apple announced the first Mac Apple silicon chip, the Apple M1, in the Late 2020 Mac Mini, MacBook Air, and MacBook Pro.[19] Apple has said that it will support Intel Macs "for years to come",[18][20] and most software that has not been ported to run on ARM Macs can use Rosetta 2, an update of a compatibility mechanism originally developed for the PowerPC-to-Intel x86 transition. Likewise, Apple also introduced an updated universal binary format, Universal 2, which allows developers to package their applications so that they can run natively on both ARM64 and x86-64 processors.[21]

Support for iOS and iPadOS applications[edit]

On Macs based on Apple silicon, macOS Big Sur can run iOS and iPadOS applications natively and without any modifications needed from developers, aside from allowing the app to be available on the Mac App Store.[18] The first Macs with this capability are those that use the Apple M1 SoC (system on a chip).

Time Machine[edit]

Time Machine, the backup mechanism introduced in Mac OS X 10.5 Leopard, has been overhauled to utilize the APFS file system instead of HFS+. Specifically, the new version of Time Machine makes use of APFS's snapshot technology.[22][23][24] According to Apple, this enables "faster, more compact, and more reliable backups" than were possible previously with HFS+-formatted backup destinations.[22][25] An independent evaluation of this claim found that Time Machine on macOS 11 in conjunction with APFS was 2.75-fold faster upon initial local backup and 4-fold faster upon subsequent backups relative to macOS 10.15's Time Machine implementation using HFS+.[25] A more modest yet nevertheless significant advantage was noted as well for backups to network-attached disks.[25]

New local (i.e. USB- or Thunderbolt-connected) and network-connected Time Machine backup destinations are formatted as APFS by default, though Time Machine can continue backing up to existing HFS+ backup volumes.[22] There is no option to convert existing, HFS+-based backups to APFS; instead, users who want to benefit from the advantages of the new, APFS-based implementation of Time Machine need to start with a fresh volume.[25]

In the new version of Time Machine, encryption appears to be required (instead of merely optional) for local disks, but it remains elective for networked volumes.[25]

It is no longer possible to restore the whole system using a Time Machine backup, as the signed system volume is not backed up. Non-core applications and user data can be restored in full using Migration Assistant, preceded by a system reinstall if necessary.


Spotlight, the file system indexing-and-search mechanism introduced in Mac OS X 10.4 Tiger, is faster and the interface has been refined. Spotlight is now the default search mechanism in Safari, Pages, and Keynote.[26][27]

Signed system volume[edit]

The system volume containing the core operating system is cryptographically signed. Apple indicates this is a security measure to prevent malicious tampering.[28] This includes adding an SHA-256 hash for every file on the system volume, preventing changes from third-party entities and the end user.[29]

Software updates[edit]

Software updates can begin in the background before a restart, thus requiring less downtime to complete. Because system files are cryptographically signed, the update software can rely on them being in precise locations, thus permitting them to be effectively updated in place.[27]


macOS Big Sur supports encryption at the file level. Earlier versions of macOS (10.15 Catalina and older) supported encryption only at the level of entire volumes.[24] As of June 2020, this capability is known to be compatible with Macs based on Apple silicon; it is unclear whether it is compatible with Intel-based Macs.[24]

Other changes[edit]

  • Bilingual dictionaries in French–German, Indonesian–English, Japanese–Simplified Chinese and Polish–English
  • Better predictive input for Chinese and Japanese users
  • New fonts for Indian users
  • The "Now Playing" widget has been moved from the Notification Center to the Menu Bar
  • Podcasts "Listen Now" feature
  • FaceTime sign language prominence
  • Network Utility has been deprecated
  • macOS startup sound is enabled by default (it had been disabled by default on some machines in 2016), and an option in System Preferences was added to enable or disable this functionality.[30]

Application features[edit]

The Safari 14 start page with Wikipedia on the reading list


Big Sur includes Safari 14, released for macOS Catalina and macOS Mojave on September 16, 2020. Safari 14 includes:[31]

  • a new customizable home page with the ability to personalize what features are visible and set a custom wallpaper
  • improved tab design with page previews and favicons
  • built-in web page translation in English, Spanish, German, French, Russian, Chinese and Portuguese. The feature is currently in beta and will not be available in macOS Catalina and Mojave[32]
  • new privacy features such as Privacy Report, which monitors privacy trackers and further increases Safari's security
  • iCloud Keychain password monitoring, which notifies the user of compromised passwords
  • better performance and power efficiency
  • extension privacy management
  • support for WebExtensions API
  • the ability to import passwords from Google's Chrome browser
  • support for 4K HDR content from Netflix on Macs with an Apple T2 chip[33]
  • support for VP9 decoding, allowing for playback of 4K and HDR content from YouTube
  • support for WebP image format

The new version of Safari also officially ends support for Adobe Flash Player, 3 months ahead of its end-of-life and 10 years after Steve Jobs' "Thoughts on Flash".


The Messages app was rewritten to be based upon Apple's Catalyst technology. This enables the app to have feature parity with its iOS counterpart. Alongside a refined design, the new Messages app brings:

  • Conversation pinning for up to nine conversations that sync across iOS, iPadOS, and macOS
  • Message searching
  • Name and photo sharing
  • Group chat photo thumbnails
  • @Mentioning individuals by name
  • Inline message replies
  • Memoji stickers and editor
  • A new photo picker
  • Localized message effects for users in India

App Store[edit]

The Mac App Store showing the Safari Extensions category

Refinements and new features of the Mac App Store include:

  • A new "nutrition label" section dedicated to the data and information an app collects, also featured in the iOS App Store
  • A new Safari extensions category
  • Third party Notification Center widgets, similar to those in iOS and iPadOS 14
  • The ability to share in-app purchases and subscriptions on the Mac via iCloud Family Sharing


  • Collapsible pinned section
  • Quick text style and formatting options
  • Scanning enhancements


  • New editing capabilities
  • Improved Retouch tool
  • New zooming feature in views


  • "Look Around" interactive street-level 360° panoramas, first implemented in the iOS 13 version of Maps, have been incorporated into the macOS version of Maps.
  • Availability of directions for cyclists.
  • Electric vehicle routing, based on proximity to charging stations and monitoring of battery levels (on selected car models).
  • Guides for exploring new places.

Voice Memos[edit]

  • a file structure has been implemented to allow organization of recordings in folders[34]
  • recordings can be marked as Favorites for easier subsequent access
  • Smart Folders automatically group Apple Watch recordings, recently deleted recordings, and Favorites
  • audio can be enhanced to reduce background noise and room reverb

Other applications found in macOS 11 Big Sur[edit]

Removed functionality[edit]

  • Calculator Notification Center Widget[35]
  • Option to toggle Font Smoothing in System Preferences[36]


The rollout of Big Sur came with several problems.[37] Upgrading to the initial public release of Big Sur (version 11.0.1) bricked some computers, rendering them unusable. Many of these were 2013 and 2014 MacBook Pros, though problems were also observed on a 2019 MacBook Pro and an iMac from the same year.[38][39][40] The initial rollout also disrupted Apple's app notarization process, causing slowdowns even on devices not running Big Sur.[41] Users also reported that the update was slow or even might fail to install.[42] macOS Catalina and Big Sur apps were taking a long time to load because of Gatekeeper issues.[43]

The ongoing issues with the COVID-19 pandemic meant it was hard for users to visit an Apple Store to get their machines fixed.[44] Shortly afterwards, Apple released a series of steps explaining how these Macs could be recovered.[45]

Certain Apple applications running on early versions of Big Sur were reported to bypass firewalls, raising privacy and security concerns.[46][47] This was addressed with the release of macOS Big Sur 11.2, which removed the whitelist for built-in programs.[48][49] Conversely, security experts have reported that Big Sur will check an application's certificate every time it is run, degrading system performance. There have been reports that the operating system sends a hash back to Apple of every program run and when it was executed.[50] Apple responded that the process is part of efforts to protect users from malware embedded in applications downloaded outside of the Mac App Store.[50]

Some users have reported problems connecting external displays to Macs running Big Sur 11.1 and 11.2.[51] Later versions 11.5.2 also reportedly have display issues when multiple monitors are connected.[citation needed]

When upgrading Macs from 10.13, 10.14 and 10.15 to Big Sur the upgrade process could become stuck for seemingly unclear reasons. Only a full system restore from backup would solve this problem. On 21 October 2021 a solution became known that required removal of up to several hundreds of thousands excess temporary files in the system folders.[52]


In 2021, there were reports of two malware codes that infected macOS and include both x86-64 and ARM64 code. The first one was detected in early 2021.[53] The second one, Silver Sparrow, was detected on nearly 30,000 Macs in February 2021.[54][55][56]

Release history[edit]

The public release of macOS 11 Big Sur began with 11.0.1 for Intel Macs. Version 11.0 was preinstalled on Apple silicon Macs, and Apple advised those with that version to be updated to 11.0.1.[57]

Previous release Current release Beta
Version Build Date Darwin version Release notes Notes
11.0 20A2411 November 17, 2020 20.1.0
N/A Preinstalled on MacBook Air (M1, 2020), MacBook Pro (13-inch, M1, 2020), and Mac mini (M1, 2020)
11.0.1 20B29 November 12, 2020 20.1.0
Security content Initial public release
20B50 November 19, 2020 Available for all Macs except Late 2013 and Mid 2014 13" MacBook Pros
11.1 20C69 December 14, 2020 20.2.0
Release notes

Security content

11.2 20D64 February 1, 2021 20.3.0
Release notes

Security content

11.2.1 20D74 February 9, 2021 Security content
20D75 February 15, 2021 Fixes bug where installation with insufficient free space could cause data loss - exclusive to the full installer[58]
11.2.2 20D80 February 25, 2021 N/A
11.2.3 20D91 March 8, 2021 Security content
11.3 20E232 April 26, 2021 20.4.0
Release notes

Security content

11.3.1 20E241 May 3, 2021 20.4.0
Security content
11.4 20F71 May 24, 2021 20.5.0
Release notes

Security content

11.5 20G71 July 21, 2021 20.6.0
Wed Jun 23 00:26:31 PDT 2021
Release notes

Security content

11.5.1 20G80 July 26, 2021 Release notes

Security content

11.5.2 20G95 August 11, 2021 Release notes
11.6 20G165 September 13, 2021 20.6.0
Mon Aug 30 06:12:21 PDT 2021
Release notes

Security content

11.6.1 20G224 October 25, 2021 20.6.0
Tue Oct 12 18:33:42 PDT 2021
Release notes

Security content

11.6.2 RC2[59] 20G306 November 16, 2021


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External links[edit]

Preceded by macOS 11 (Big Sur)
Succeeded by