Apple today seeded build 12F36 of OS X 10.8.5 to developers, marking the ninth developer beta iteration of 10.8.5. The release comes several weeks after the previous OS X 10.8.5 beta, build 12F33. Apple also seeded build 12F35 of OS X 10.8.5 to employees two weeks ago.

12f36
As with previous betas, the update contains no known issues and can be downloaded via Apple’s Developer page or through the software update tool of the Mac App Store. Build 12F36 asks developers to test PDF viewing and accessibility, along with mobile device management and the standard graphics, Wi-Fi, and wake from sleep functionality. A new seed of Safari 6.1 is also available for developers.

Apple's OS X 10.8.5 beta is being tested alongside the next version of the operating system, OS X Mavericks. Apple has thus far seeded seven Developer Previews of Mavericks and plans to offer the new operating system to the public in the fall.

Top Rated Comments

Dulcimer Avatar
156 months ago
Really, I don't understand all these beta releases for an outgoing operating system…..

Not everyone will update to Mavericks, and there are still bugs/issues to fix in ML.
Score: 13 Votes (Like | Disagree)
chrfr Avatar
156 months ago
Not all Macs still in use will support Maverick.
System requirements for Mavericks and Mountain Lion are identical.
Score: 12 Votes (Like | Disagree)
Mike MA Avatar
156 months ago
Really, I don't understand all these beta releases for an outgoing operating system…..
Why would you not upgrade to a far superior OS? Mavericks is a quantum leap in performance.
Not all Macs still in use will support Maverick.
Score: 11 Votes (Like | Disagree)
jameslmoser Avatar
156 months ago
That doesn't mean Apple will include supported drivers for those computers

Actually thats exactly what it means... they are all apple systems, so they will include the drivers for all those systems they sold.
Score: 7 Votes (Like | Disagree)
Risco Avatar
156 months ago
Not everyone will update to Mavericks, and there are still bugs/issues to fix in ML.

Why would you not upgrade to a far superior OS? Mavericks is a quantum leap in performance.
Score: 6 Votes (Like | Disagree)
C DM Avatar
156 months ago
Not everyone will be able to or will want to spend the money on updating. Not everyone necessarily needs to (despite it potentially being newer/better). Not everyone is using a Mac in an environment where they choose what to install or update to--like a corporate environment--and a brand new version that costs money might not get installed in an environment like that for some time, while some needed security, stability, performance, and general fixes would still be more than welcome for the existing OS that is in use in those environments.
Score: 4 Votes (Like | Disagree)

Popular Stories

iPhone 17 Pro Dark Blue and Orange

iPhone 17 Release Date, Pre-Orders, and What to Expect

Thursday August 28, 2025 4:08 am PDT by
An iPhone 17 announcement is a dead cert for September 2025 – Apple has already sent out invites for an "Awe dropping" event on Tuesday, September 9 at the Apple Park campus in Cupertino, California. The timing follows Apple's trend of introducing new iPhone models annually in the fall. At the event, Apple is expected to unveil its new-generation iPhone 17, an all-new ultra-thin iPhone 17...
Awe Dropping Apple Event Feature

Five Things to Expect From Apple's 'Awe Dropping' September 9 Event

Tuesday August 26, 2025 4:17 pm PDT by
Apple today announced its "Awe Dropping" iPhone-centric event, which is set to take place on Tuesday, September 9 at 10:00 a.m. Pacific Time. There are a long list of products that are coming, but we thought we'd pull out five feature highlights to look forward to. That Super Thin iPhone - Apple's September 9 event will see the unveiling of the first redesigned iPhone we've had in years, ...
Awe Dropping Apple Event Feature

Apple Event Logo Hints at Two iPhone 17 Pro Features

Wednesday August 27, 2025 6:36 am PDT by
Apple's logo for its upcoming September 9 event hints at two rumored iPhone 17 Pro features, including new color options and a vapor chamber cooling system. Of course, this is all just speculation for fun, as we count down the final days until the event. New Colors Last month, Macworld's Filipe Espósito reported that orange and dark blue would be two out of the five color options...
Alleged iPhone 17 Pro Antenna Design

Two All-New iPhone 17 Colors Seemingly Confirmed

Monday August 25, 2025 4:22 am PDT by
Apple will offer the upcoming iPhone 17 Pro and iPhone 17 Pro Max in a new orange color, according to Bloomberg's Mark Gurman. Gurman made the claim in the latest edition of his Power On newsletter, adding that the new iPhone 17 Air – replacing the iPhone 16 Plus – will come in a new light blue color. We've heard multiple rumors about a new iPhone 17 Pro color being a shade of orange. The ...
crossbody strap

iPhone 17's 'Crossbody Strap' Accessory to Feature Magnetic Design

Thursday August 28, 2025 7:49 am PDT by
Apple's cases for the iPhone 17 lineup will be accompanied by a new Crossbody Strap accessory with a unique magnetic design, according to the leaker known as "Majin Bu." Apple's Crossbody Strap reportedly features an unusual magnetic design; it likely has a "flexible metal core" that makes it magnetic along its entire length. At the ends, "rings polarized oppositely to the strap close the...
airpods pro 2 gradient

AirPods Pro 3: Four Key Design Changes Anticipated

Tuesday August 26, 2025 4:05 am PDT by
Apple hasn't updated the AirPods Pro since 2022 other than a shift from Lightning to USB-C, and the earbuds are due for a refresh. According to Bloomberg's Mark Gurman, Apple will launch AirPods Pro 3 later this year, and apart from new features like heart rate monitoring, we're also expecting a few design changes. The fourth‑generation AirPods offer useful clues to Apple's design cues for ...