Apple's app design Bible is now a free iBook through iTunes

Apple’s app design Bible, iOS Human Interface Guidelines, is now a free download from iTune’s iBookstore. The guidelines were only previously available through Apple’s Developer Portal, but now it’s free as a convenient iBook document with useful annotations and videos.

Once inside the app design Bible, readers can glean some of the design decisions Apple developers go through when creating apps for iOS. From understanding what makes a great user experience to clean, simple color palettes and fonts – the book is a nice way to browse what was once only available as a PDF.

As a whole, readers can simplify iOS 7’s design methodology into these basic principles:

Deference.