Platform guides

• Human Interface Guidelines

  by Apple

• Material Design Guidelines

  by Google

• The iOS Design Guidelines

  by Ivo Mynttinen

• The Ultimate Guide To iPhone Resolutions

  by PaintCode

• Material Design - Device Metrics

  by Google

Good reads

• Pixel Density, Demystified

  by Peter Nowell

• Designing beautiful mobile apps from scratch

  by Harshita Arora

• Mobile in The Future

  by Luke Wroblewski

• Designing Push Notifications that Don’t Suck

  by Antoine Sakho

• User Onboarding | A frequently-updated compendium of web app first-run experiences

  by Samuel Hulick

• Mobile first

  by Luke Wroblewski $$$

• A quick and dirty guide to writing clean microcopy

  by Daresay

• Mental Models I Find Repeatedly Useful

  by Gabriel Weinberg

• Multi-Device Layout Patterns

  by Luke Wroblewski

• Colour management settings for design tools

  by Marc Edwards

• Designer's guide to DPI

  by Sebastien Gabriel

• Heuristic Principles for Mobile Interfaces

  by Jordan Devos

Videos

• Designing Fluid Interfaces - WWDC 2018

  by Apple

• Designing Across Platforms - WWDC 2017

  by Apple

• App Icon Design - WWDC 2017

  by Apple

• Iterative UI Design - WWDC 2017

  by Apple

• Conversations @ Google - Part 1

  by Luke Wroblewski

• Basics of UI Design for Mobile Apps - Artboard Size, Screen Density and Resolution for Beginners

  by Design Pilot - Chethan KVS

• Designing Dark Theme/Dark Mode for Android Apps using Material Design - The Ultimate Guide!

  by Design Pilot - Chethan KVS

• Designing Dark Mode for iOS Apps - Tutorial

  by Design Pilot - Chethan KVS

Courses

• Learn iOS 11 Design

  by Meng To $$$

• Mobile App Design for iOS

  by Sarah Parmenter $$$

• Material Design for Android Developers

  by Google

Inspiration

• Pttrns - Mobile Design Patterns

  by Pttrns

• Mobbin - Latest Mobile Design Patterns

  by Mobbin

• Underbite - iOS Design Inspiration

  by Underbite

• iOS Icon Gallery

  by Jim Nielsen

• UI Sources

  by Abhinav Chhikara

Downloads

• Apple Design Resources: iOS

  by Apple

• iOS Design Kit

  by Great Simple Studio

• Material Design Kit

  by Great Simple Studio $$$

• Android Asset Studio

  by Roman Nurik

• Devices

  by Facebook Design

• Sketchize: Free Wireframing Sheets

  by Sketchize

• Superior iOS Framework

  by Interface.Market $$$

• Bjango App Icon Templates

  by Marc Edwards

• Vector Mockups Library

  by KK UI Store

• Material Icons Library

  by Pixsellz

• Plaster - Mobile Design System

  by Buninux $$$

• Fragments iOS Wireframe Kit

  by Pixsellz $$$

• Mobile Apps Library

  by Pixsellz

Tools

• Figma: the collaborative interface design tool

  by Figma $$$

• Sketch - The digital design toolkit

  by Sketch $$$

• Adobe XD

  by Adobe $$$

• Framer - Interactive Design Tool

  by Framer $$$

• Principle - Animated Design

  by Principle $$$

• Invision - Digital product design, workflow & collaboration

  by Invision

• Flinto - The App Design App

  by Flinto $$$

• Origami Studio - Interaction Prototyping

  by Facebook

• Shotsnapp - Create beautiful device mockup presentation

  by Shotsnapp

• Abstract - Version, manage, and collaborate on your Sketch files

  by Abstract $$$