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

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...
Apple Logo Black

Apple Just Made Its Second-Biggest Acquisition Ever After Beats

Thursday January 29, 2026 10:07 am PST by
Apple today confirmed to Reuters that it has acquired Q.ai, an Israeli startup that is working on artificial intelligence technology for audio. Apple paid close to $2 billion for Q.ai, according to sources cited by the Financial Times. That would make this Apple's second-biggest acquisition ever, after it paid $3 billion for the popular headphone and audio brand Beats in 2014. Q.ai has...
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...
14 inch MacBook Pro Keyboard

Apple Changes How You Order a Mac

Saturday January 31, 2026 10:51 am PST by
Apple recently updated its online store with a new ordering process for Macs, including the MacBook Air, MacBook Pro, iMac, Mac mini, Mac Studio, and Mac Pro. There used to be a handful of standard configurations available for each Mac, but now you must configure a Mac entirely from scratch on a feature-by-feature basis. In other words, ordering a new Mac now works much like ordering an...
Apple MacBook Pro M4 hero

New MacBook Pros Reportedly Launching Alongside macOS 26.3

Sunday February 1, 2026 5:42 am PST by
Apple is planning to launch new MacBook Pro models with M5 Pro and M5 Max chips alongside macOS 26.3, according to Bloomberg's Mark Gurman. "Apple's faster MacBook Pros are planned for the macOS 26.3 release cycle," wrote Gurman, in his Power On newsletter today. "I'm told the new models — code-named J714 and J716 — are slated for the macOS 26.3 software cycle, which runs from...

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)