How to Enable Dark Mode in OS X 10.10 Yosemite Beta

Hamza Sood has discovered how to enable a somewhat functional dark mode in OS X 10.10 Yosemite Beta 2 via Terminal.

 

To enable the somewhat functional dark mode: sudo defaults write /Library/Preferences/.GlobalPreferences AppleInterfaceTheme Dark

 

To undo, either remove the key (defaults delete) or change it to “Light”

 

To enable the somewhat functional dark mode:
sudo defaults write /Library/Preferences/.GlobalPreferences AppleInterfaceTheme Dark

— Hamza Sood (@hamzasood) June 17, 2014

 

Or you can try this option

• Open your /System/Library/CoreServices folder by clicking Go >> Computer on the Apple menu bar, click your Yosemite drive then go to System >> Library >> CoreServices

• Right click SystemAppearance.bundle and choose Show Package Contents and Open Content >> Resources

• Rename “DarkAppearance.car” to “GraphiteAppearance.car”

• Open System Preference >> General

• Under Appearance switch from Blue to Graphite

• Logout and log back in