Apple Seeds OS X Mavericks 10.9.3 Build 13D28 to Developers - MacRumors
Skip to Content

Apple Seeds OS X Mavericks 10.9.3 Build 13D28 to Developers

by

Apple today seeded build 13D28 of OS X 10.9.3 to developers, a little over one week after releasing the third OS X 10.9.3 beta, build 13D21 and three weeks after the first 10.9.3 beta. The beta is available through the Software Update mechanism in the Mac App Store as well as through the Mac Dev Center.

13d28
Apple is currently asking developers to focus on Graphics Drivers and Audio. As was discovered with the first beta, 10.9.3 adds new support for 4K displays, offering "Retina" resolutions that improve readability along with support for 60Hz output from the Retina MacBook Pro.

Top Rated Comments

Nunyabinez Avatar
164 months ago
I am wondering when they will start working on OS 11, and what they will name it.
OS X is a brand. It's like saying "when will they change the name of the iPhone?"

OS X was a play on words (it's pronounced Oh Ess Ten) because Apple was on version 9.x of the Mac operating system.

When Steve Jobs returned from NeXt (notice the capital X) he brought the Unix-based operating system that they had been developing.

OS X wasn't called OS 10 because it was a completely new kernel based on Unix. So the play on works was to call it Oh Ess Ten but write is as OS X to signify that it was the operating system following 9.x but was Unix based.

So, unless there is a brand new kernel that gets introduced, the name will never change from OS X. We are currently on OS X 10.9.2. You would pronounce this Oh Ess Ten, Ten point Nine point Two. The next major release will be either OS X 10.10, or it could be OS X 11.0 (unlikely). There will be no OS 11.
Score: 21 Votes (Like | Disagree)
quagmire Avatar
164 months ago
I too am a fan of Bertrand Serlet. I thought 10.6 was the amazing OS for the time of its release. I had a top of the MBP and added 8 GB (a lot for the time - I think we spent nearly a grand on the memory) and ran 10.6 doing some heavy development projects. 10.6 just screamed. It was just a well-tuned, solid, extremely efficient OS.

-P
Yeah we need another Snow Leopard like release. No new features, just a clean out the bloat and streamline everything. And if OS X continues to be free, don't think it will be an issue with users.
Score: 5 Votes (Like | Disagree)
Kariya Avatar
164 months ago
It's been a bad sign, for me and many others. Before 10.7, OS X 10.X development varied between 1 ½ to 2 ½ years with biweekly or weekly releases that required downloading a .dmg from the developer site, burning the image to a DVD, wiping the system and installing a "clean" OS. This allowed for improved debugging by eliminating any possible third party app "contamination" (10.7+ releases have proved difficult to properly isolate any system matters), and allowed Apple more time to "get it right" before release. Of course not all 10.X first releases were stellar, but they were far better than the current annual release cycle to match iOS. There is no need to rush out annual OS overhauls, especially as we're just on 10.9.3 beta. By the time iOS is released it may be .5 or .6.

Personally, while Craig Federighi is an excellent engineer, nothing beats the work Bertrand Serlet did while SVP of OS X engineering. I still believe 10.5/6 are the best OS X releases to date (and before the "Serlet was involved with 10.7, he was not, he was already on his way out the door to Parallels 2009-2010, 10.7 was all Federighi).
Every OS X update since Snow Leopard its the same complaint from you. You sound like a broken record. Bertrand is gone. He's been gone for years now. And he's not coming back. Federighi worked under Bertrand too and i doubt he was twiddling his thumbs throughout that period.

People only tend to remember the good things of the past. Snow Leopard and even worse Leopard were far from perfect

Mavericks is a very solid OS...even more so since 10.9.2. And in my opinion, is superior to 10.5/10.6 overall.
Score: 4 Votes (Like | Disagree)
Pentad Avatar
164 months ago
Personally, while Craig Federighi is an excellent engineer, nothing beats the work Bertrand Serlet did while SVP of OS X engineering. I still believe 10.5/6 are the best OS X releases to date (and before the "Serlet was involved with 10.7, he was not, he was already on his way out the door to Parallels 2009-2010, 10.7 was all Federighi).

I too am a fan of Bertrand Serlet. I thought 10.6 was the amazing OS for the time of its release. I had a top of the MBP and added 8 GB (a lot for the time - I think we spent nearly a grand on the memory) and ran 10.6 doing some heavy development projects. 10.6 just screamed. It was just a well-tuned, solid, extremely efficient OS.

-P
Score: 4 Votes (Like | Disagree)
Orlandoech Avatar
164 months ago
OS X is a brand. It's like saying "when will they change the name of the iPhone?"

OS X was a play on words (it's pronounced Oh Ess Ten) because Apple was on version 9.x of the Mac operating system.

When Steve Jobs returned from NeXt (notice the capital X) he brought the Unix-based operating system that they had been developing.

OS X wasn't called OS 10 because it was a completely new kernel based on Unix. So the play on works was to call it Oh Ess Ten but write is as OS X to signify that it was the operating system following 9.x but was Unix based.

So, unless there is a brand new kernel that gets introduced, the name will never change from OS X. We are currently on OS X 10.9.2. You would pronounce this Oh Ess Ten, Ten point Nine point Two. The next major release will be either OS X 10.10, or it could be OS X 11.0 (unlikely). There will be no OS 11.

Love your post. Thanks for the info. Being serious FYI.
Score: 4 Votes (Like | Disagree)
maflynn Avatar
164 months ago
[MOD NOTE]
Please stay on topic, this thread is not about the OSX branding, or about Snow Leopard or any prior version of OSX. Its about the new 10.9.3 build and as such please discuss that.
Score: 3 Votes (Like | Disagree)

Popular Stories

M5 MacBook Pro

RIP, MacBook Ultra

Monday October 19, 2026 9:37 am PDT by
Apple today sent out invites for an experience in Los Angeles on Wednesday, October 28, and the "Pro and tell" tagline on the invitation likely means that the rumored MacBook models with touch-enabled OLED displays will stick with MacBook Pro branding instead of the once-rumored "MacBook Ultra" name. The long-rumored "iPhone Ultra" ended up being named iPhone Duo, so speculation that Apple...
iPhone Duo Trio

Here's What Apple's Apps Look Like on the iPhone Duo

Tuesday October 20, 2026 11:12 am PDT by
With just three days to go until the iPhone Duo is released, Apple is getting ready for the launch. Behind the scenes, the App Store now has screenshots of Apple's built-in apps running on the Duo. We've seen some apps in marketing materials, but images of the ones we haven't seen give us an idea of what it will be like using the iPhone Duo day to day. Many apps are shown in landscape...
apple pro tell logo

Apple Announcing New Products Next Week: 'Pro and Tell'

Monday October 19, 2026 9:05 am PDT by
Apple's Greg Joswiak today hinted at new product announcements coming next week, sharing a social media post that says "Can't wait to pro and tell next week." Rumors suggest Apple is planning to debut the new MacBook Pro with an OLED touchscreen display, an M6 entry-level MacBook Pro, an M6 iMac, an iPad mini with an OLED display. Can't wait to pro and tell next week....
Latest Stories
Tesla App Gains iPad and iPhone Duo Support
Tesla App Gains iPad and iPhone Duo Support
2 hours ago
Apple Reportedly Boosts iPhone Duo Orders by 44%
Apple Reportedly Boosts iPhone Duo Orders by 44%
2 hours ago
Fortnite Returning to Australian App Store After Court Ruling
Fortnite Returning to Australian App Store After Court Ruling
3 hours ago
Apple Ordered to Open iPhone to Rival App Stores in Australia
Apple Ordered to Open iPhone to Rival App Stores in Australia
3 hours ago
Apple Suppliers Face Hurdles Cutting Circuit Board Emissions
Apple Suppliers Face Hurdles Cutting Circuit Board Emissions
3 hours ago
Things Updated for iPhone Duo With Adaptive Layout
Things Updated for iPhone Duo With Adaptive Layout
4 hours ago
Simplicity and Siri AI Are HomeView's Killer Features, Apple Says
Simplicity and Siri AI Are HomeView's Killer Features, Apple Says
4 hours ago
iPhone Duo Reviewers Really Miss Face ID
iPhone Duo Reviewers Really Miss Face ID
9 hours ago
Does the iPhone Duo Run Hot? Here's What Reviews Found
Does the iPhone Duo Run Hot? Here's What Reviews Found
10 hours ago
Apple Music's New Look is Now Live on Apple's Website
Apple Music's New Look is Now Live on Apple's Website
11 hours ago
Anthropic Launches Claude Duet, a Proactive AI Agent
Anthropic Launches Claude Duet, a Proactive AI Agent
12 hours ago
What 32,000 Folds Did to the iPhone Duo's Hinge
What 32,000 Folds Did to the iPhone Duo's Hinge
12 hours ago
iPhone Duo's Hidden FaceTime Camera Takes 'Trash' Photos
iPhone Duo's Hidden FaceTime Camera Takes 'Trash' Photos
14 hours ago
iPhone Duo Has 'Edge Light' Feature That Debuted on Macs Last Year
iPhone Duo Has 'Edge Light' Feature That Debuted on Macs Last Year
14 hours ago
Apple Support App Updated for iPhone Duo's Larger Display
Apple Support App Updated for iPhone Duo's Larger Display
15 hours ago
Amazon Sweetens the Deal on Entry-Level 16-Inch MacBook Pro With $570 Off
Amazon Sweetens the Deal on Entry-Level 16-Inch MacBook Pro With $570 Off
15 hours ago
iPhone Duo Tips Over on MagSafe Stands When Unfolded
iPhone Duo Tips Over on MagSafe Stands When Unfolded
15 hours ago
Apple Music's New Look Officially Announced
Apple Music's New Look Officially Announced
16 hours ago
iPhone Duo Supports Apple Pencil Starting With iOS 27.2
iPhone Duo Supports Apple Pencil Starting With iOS 27.2
17 hours ago
iPhone Duo Accessories Roundup: Cases and Screen Protectors From OtterBox, ZAGG, and More
iPhone Duo Accessories Roundup: Cases and Screen Protectors From OtterBox, ZAGG, and More
18 hours ago
Apple Stores Will Have 'Limited' Availability of iPhone Duo for Walk-In Customers
Apple Stores Will Have 'Limited' Availability of iPhone Duo for Walk-In Customers
18 hours ago
iPhone Duo Reviews Explain Why Device is Both 'Fun' and 'Frustrating'
iPhone Duo Reviews Explain Why Device is Both 'Fun' and 'Frustrating'
19 hours ago
Apple Says 'Reachability' Feature Coming to iPhone Duo Later This Year
Apple Says 'Reachability' Feature Coming to iPhone Duo Later This Year
20 hours ago
Loop Capital Cuts Apple Rating Over iPhone Sales Outlook
Loop Capital Cuts Apple Rating Over iPhone Sales Outlook
1 day ago
Apple Stores in Bordeaux and Lille Looted During French Protests
Apple Stores in Bordeaux and Lille Looted During French Protests
1 day ago
Bluesound Adds Native Apple Music Support
Bluesound Adds Native Apple Music Support
1 day ago
Apple CEO John Ternus Explains What Makes Good Product Design
Apple CEO John Ternus Explains What Makes Good Product Design
1 day ago
UK Proposes New Ways to Help Apple Pay Rivals
UK Proposes New Ways to Help Apple Pay Rivals
1 day ago
WhatsApp Developing In-App Browser for All Chat Links on iPhone
WhatsApp Developing In-App Browser for All Chat Links on iPhone
1 day ago
Apple's App Store Chief Explains Its Push for Premium Games
Apple's App Store Chief Explains Its Push for Premium Games
1 day ago