Human-Computer Interaction + Design Center - Northwestern University

Some resources we’ve found:

• Digital Psychology: “A free library of psychological principles and examples to elevate your SaaS, e-commerce or other digital products.”
• 20 Guiding Principles for Experience Design
• UI-patterns.com: User Interface Design Patterns - UI patterns and “persuasive design patterns,” includes rationales for each pattern

Mobile-specific

These sites are mostly screenshots of flows from familiar apps, categorized by use case and platform

• mobile-patterns.com iPhone/Android
• inspired-ui.com iPhone/Android/iPad
• Pttrns.com iPhone/Android/iPad/Watch