Download OS X Yosemite 10.10 Developer Preview 3

In addition to seeding the third beta of iOS 8 this morning, Apple has also released the third Developer Preview of its new OS X Yosemite operating system. The update comes three weeks after Preview 2, and over a month after Apple announced Yosemite at WWDC.

The update is labeled as build 14A283o and can be downloaded via an update in the Mac App Store, or as a full download from Apple’s online developer center. It does not, however, appear to be out in Apple’s recently-launched public Yosemite Beta Seed program yet…

The previous beta brought about just a handful of changes including a new Screen Sharing option to block others, a revamped Tim Machine interface and more. It also re-added the Photo Booth app with an all-new icon and enhancements for Handoff and AirDrop features.

IMPORTANT: Before upgrading OS X Yosemite 10.10 Developer Preview 3, you need to install OS X 10.10 Developer Preview 1 or Developer Preview 2.

What’s New

What’s new in Developer Preview 3

  • Dark Mode is now officially available, accessible via Settings app
  • New QuickTime icon
  • Revamped Mail icons
  • You can now access Bookmark Folders via Address Bar in Safari
  • Tweaked UI in System and iCloud Preferences
  • Enhanced notifications with larger App icon badges and improved NC fonts


OSX 10.10 DP1 or later


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