Apple Seeds Eighth Beta of OS X El Capitan to Developers, Sixth Beta to Public Testers

Apple today released the eighth beta of OS X El Capitan to developers for testing purposes, nearly two weeks after releasing the seventh El Capitan beta and more than two months after unveiling the operating system at its 2015 Worldwide Developers Conference.

Today's update, build 15A279b, is available through the software update mechanism in the Mac App Store and through the Apple Developer Center. There's also a new sixth beta for public beta testers, which is identical to the eighth developer beta.

It is not clear if this update will add any outward-facing changes to El Capitan, as many of the prior betas have focused on under-the-hood performance improvements and bug fixes to optimize the operating system ahead of its public release, but beta 7 did add some minor cosmetic updates to El Capitan.

As an update complementary to OS X Yosemite, OS X El Capitan builds on the myriad features introduced last year. Behind-the-scenes improvements in El Capitan make a number of apps and processes on the Mac faster, and the introduction of Metal makes system-level graphics rendering 40 percent more efficient.


El Capitan introduces a new system-wide font, a revamped Mission Control feature, a split-view feature for using two full-screen apps at once, deeper functionality for Spotlight, and improvements to Safari that include Pinned Sites and a universal mute button.

OS X 10.11 El Capitan is currently available to both registered developers and public beta testers. Apple plans to release El Capitan to the public in the fall.

Related Forum: OS X El Capitan

Popular Stories

iOS 26

iOS 26.3 and iOS 26.4 Will Add These New Features to Your iPhone

Tuesday February 3, 2026 7:47 am PST by
We are still waiting for the iOS 26.3 Release Candidate to come out, so the first iOS 26.4 beta is likely still at least a week or two away. Following beta testing, iOS 26.4 will likely be released to the general public in March or April. Below, we have recapped known or rumored iOS 26.3 and iOS 26.4 features so far. iOS 26.3 iPhone to Android Transfer Tool iOS 26.3 makes it easier...
Apple Logo Black

Apple's Next Launch is 'Imminent'

Sunday February 1, 2026 12:31 pm PST by
The calendar has turned to February, and a new report indicates that Apple's next product launch is "imminent," in the form of new MacBook Pro models. "All signs point to an imminent launch of next-generation MacBook Pros that retain the current form factor but deliver faster chips," Bloomberg's Mark Gurman said on Sunday. "I'm told the new models — code-named J714 and J716 — are slated...
iOS 26 Home Feature

Apple Gives Final Warning to Home App Users

Tuesday February 3, 2026 8:55 am PST by
In 2022, Apple introduced a new Apple Home architecture that is "more reliable and efficient," and the deadline to upgrade and avoid issues is fast approaching. In an email this week, Apple gave customers a final reminder to upgrade their Home app by February 10, 2026. Apple says users who do not upgrade may experience issues with accessories and automations, or lose access to their smart...
Aston Martin CarPlay Ultra Screen

Apple's CarPlay Ultra to Expand to These Vehicle Brands Later This Year

Sunday February 1, 2026 10:08 am PST by
Last year, Apple launched CarPlay Ultra, the long-awaited next-generation version of its CarPlay software system for vehicles. Nearly nine months later, CarPlay Ultra is still limited to Aston Martin's latest luxury vehicles, but that should change fairly soon. In May 2025, Apple said many other vehicle brands planned to offer CarPlay Ultra, including Hyundai, Kia, and Genesis. In his Powe...
imac video apple feature

Apple Makes Its Second-Biggest Acquisition Ever

Tuesday February 3, 2026 12:45 pm PST by
Apple recently acquired Israeli startup Q.ai for close to $2 billion, according to Financial Times sources. That would make this Apple's second-biggest acquisition ever, after it paid $3 billion for the popular headphone maker Beats in 2014. This is also the largest known Apple acquisition since the company purchased Intel's smartphone modem business and patents for $1 billion in 2019....

Top Rated Comments

Sanlitun Avatar
136 months ago
I'm making a mental note to haunt the next iOS beta thread with confusing and irrelevant messages about OS X....
Score: 29 Votes (Like | Disagree)
maflynn Avatar
136 months ago
[MOD NOTE]
This thread is about OS X, not iOS. Please stay on topic.
Score: 12 Votes (Like | Disagree)
TimUSCA Avatar
136 months ago
Those of you waiting on iOS 9, I wouldn't hold your breath...

Given the lack of iOS 9 betas, I can only assume it's at a point where they're ready to add Force Touch but can't until new hardware is announced.
Score: 10 Votes (Like | Disagree)
ErikGrim Avatar
136 months ago
So - I will never install any beta from Apple - never again this mess and they now seems incompetent to me.
Apple seems incompetent for you installing a pre-release and unfinished product. Riiiiiiiiiiiight...
Score: 7 Votes (Like | Disagree)
bbeagle Avatar
136 months ago
Winter is coming
One more big update
Still 23 more days of Summer left, and WINTER is coming???
Score: 6 Votes (Like | Disagree)
GadgetBen Avatar
136 months ago
Never put beta OS's over your current system. If you want to be dumb enough, at least back up all your data.
The Public Beta works fine and I installed it on my 5k iMac, stop scaremongering. I am not a developer and I have the public beta installed and it is more stable than any GM of Yosemite!

daditude2284 and tdb2284 go for it, its a vast improvement on Yosemite.
Score: 5 Votes (Like | Disagree)