In any design, consistency is key. So creating a UI design with familiar visuals to the OS they run on is a sure fire way to boost your platform’s user experience. Better yet, it helps throughout the development process! Both Apple and Google have published their design guidelines online for designers, developers and marketing teams to study; Google with Material Design and Apple with Human Interface Guidelines.

While they both have a great icon library, they are some of the best free design tools for UX design!