mavericks.pngApple today seeded build 13D55 of OS X 10.9.3 to developers, just over a week after releasing the eighth OS X beta, build 13D45a, and nearly two months 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.

Apple continues to ask developers to focus on Graphics Drivers, Audio, Mail, Contacts and Calendar sync over USB in iTunes, and Safari. 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

v1597psh Avatar
144 months ago
Apple also added support in previous builds of 10.9.3 for Slow-motion playback in QuickTime and QuickLook for videos with high frame rate. For example captured by iPhone 5s. This feature hasn't been mentioned in the thread.
Score: 13 Votes (Like | Disagree)
slicecom Avatar
144 months ago
655MB. Just kidding - I have no clue how big it is - but I miss those meaningless size of the download posts.

Downloading now. Just kidding - I'm not downloading it right now - but I miss those meaningless downloading now posts.
Score: 12 Votes (Like | Disagree)
MrGimper Avatar
144 months ago
I've already explained why public beta testers can't see it yet.



You should read previous posts in this thread.



Do I have to start quoting myself?
No, but you could get off your soap box...
Score: 11 Votes (Like | Disagree)
Michael Goff Avatar
144 months ago
I've already explained why public beta testers can't see it yet.

You should read previous posts in this thread.

Do I have to start quoting myself?

I assume that, given the tone of this post, you must work for Apple? You must have some reason to expect everybody to just accept your word as the end-all-be-all.
Score: 11 Votes (Like | Disagree)
SvP Avatar
144 months ago
There is a good reason for the delay in releasing it to public beta testers (or for that matter not releasing it at all to them).

Lets say the build is a disaster and ruins your mac. Developers are probably better at fixing it than the general public. So it makes sense to give it to them first - just in case it is a disaster.

Nonsense
Score: 10 Votes (Like | Disagree)
laurihoefs Avatar
144 months ago
Apple has way too many $billions in their pocket to being crowd-sourcing (and without any sort of monetary reward, to boot) beta-testing of an operating system. Hire more people, Apple. Apple could literally afford to have two thousand guys in a huge auditorium doing nothing but beta-testing OS X all day. They wouldn't reguire a huge salary, either. I'm sure a number of computer geeks out there would be willing to do that for $10/hour. It would come with the prestige of being an Apple employee ;)

Companies don't (or at least shouldn't) do public betas to cut costs, they do them to improve the quality of their software. Public betas might not even be cheaper than hiring people directly to do the testing: the company has to go through more support requests, more bug reports, more bandwidth used to distribute the betas, etc.

What makes public betas so useful, is that it brings more environments, users, use cases, and combinations of hardware and software to the testing, than you could ever arrange in a controlled testing environment. For example, the with more beta testers the issues with WD SmartWare (https://www.macrumors.com/2013/11/26/western-digital-releases-new-hard-drive-software-after-mavericks-data-loss/) might have been spotted well before Mavericks was released. It's much easier to recognize patterns, if you have more bug reports to work with.
Score: 5 Votes (Like | Disagree)

Popular Stories

iphone 16 display

iPhone 17's Scratch Resistant Anti-Reflective Display Coating Canceled

Monday April 28, 2025 12:48 pm PDT by
Apple may have canceled the super scratch resistant anti-reflective display coating that it planned to use for the iPhone 17 Pro models, according to a source with reliable information that spoke to MacRumors. Last spring, Weibo leaker Instant Digital suggested Apple was working on a new anti-reflective display layer that was more scratch resistant than the Ceramic Shield. We haven't heard...
iPhone 17 Air Pastel Feature

iPhone 17 Reaches Key Milestone Ahead of Mass Production

Monday April 28, 2025 8:44 am PDT by
Apple has completed Engineering Validation Testing (EVT) for at least one iPhone 17 model, according to a paywalled preview of an upcoming DigiTimes report. iPhone 17 Air mockup based on rumored design The EVT stage involves Apple testing iPhone 17 prototypes to ensure the hardware works as expected. There are still DVT (Design Validation Test) and PVT (Production Validation Test) stages to...
iphone 17 air iphone 16 pro

iPhone 17 Air USB-C Port May Have This Unusual Design Quirk

Wednesday April 30, 2025 3:59 am PDT by
Apple is preparing to launch a dramatically thinner iPhone this September, and if recent leaks are anything to go by, the so-called iPhone 17 Air could boast one of the most radical design shifts in recent years. iPhone 17 Air dummy model alongside iPhone 16 Pro (credit: AppleTrack) At just 5.5mm thick (excluding a slightly raised camera bump), the 6.6-inch iPhone 17 Air is expected to become ...
Beyond iPhone 13 Better Blue

20th Anniversary iPhone Likely to Be Made in China Due to 'Extraordinarily Complex' Design

Monday April 28, 2025 4:29 am PDT by
Apple will likely manufacture its 20th anniversary iPhone models in China, despite broader efforts to shift production to India, according to Bloomberg's Mark Gurman. In 2027, Apple is planning a "major shake-up" for the iPhone lineup to mark two decades since the original model launched. Gurman's previous reporting indicates the company will introduce a foldable iPhone alongside a "bold"...
apple watch ultra yellow

What's Next for the Apple Watch Ultra 3 and Apple Watch SE 3

Friday April 25, 2025 2:44 pm PDT by
This week marks the 10th anniversary of the Apple Watch, which launched on April 24, 2015. Yesterday, we recapped features rumored for the Apple Watch Series 11, but since 2015, the Apple Watch has also branched out into the Apple Watch Ultra and the Apple Watch SE, so we thought we'd take a look at what's next for those product lines, too. 2025 Apple Watch Ultra 3 Apple didn't update the...
AirPods Pro 3 Mock Feature

AirPods Pro 3 Just Months Away – Here's What We Know

Tuesday April 29, 2025 1:30 am PDT by
Despite being more than two years old, Apple's AirPods Pro 2 still dominate the premium wireless‑earbud space, thanks to a potent mix of top‑tier audio, class‑leading noise cancellation, and Apple's habit of delivering major new features through software updates. With AirPods Pro 3 widely expected to arrive in 2025, prospective buyers now face a familiar dilemma: snap up the proven...
iPhone 17 Pro Blue Feature Tighter Crop

iPhone 17 Pro Launching Later This Year With These 13 New Features

Wednesday April 23, 2025 8:31 am PDT by
While the iPhone 17 Pro and iPhone 17 Pro Max are not expected to launch until September, there are already plenty of rumors about the devices. Below, we recap key changes rumored for the iPhone 17 Pro models as of April 2025: Aluminum frame: iPhone 17 Pro models are rumored to have an aluminum frame, whereas the iPhone 15 Pro and iPhone 16 Pro models have a titanium frame, and the iPhone ...
iPhone 17 Pro on Desk Feature

All iPhone 17 Models Again Rumored to Feature 12GB of RAM

Tuesday April 29, 2025 3:36 am PDT by
All upcoming iPhone 17 models will come equipped with 12GB of RAM to support Apple Intelligence, according to the Weibo-based leaker Digital Chat Station. The claim from the Chinese leaker, who has sources within Apple's supply chain, comes a few days after industry analyst Ming-Chi Kuo said that the iPhone 17 Air, iPhone 17 Pro, and iPhone 17 Pro Max will all be equipped with 12GB of RAM. ...