The Samsung Galaxy S4 brought TouchWiz Nature UX 2.0, an expanded version of the software that we saw on the Galaxy S3 with new S Voice features and new motion control options thanks to a multitude of sensors built-in to the new device.
New apps arrived to take advantage of the new software features and users experienced Smart Scroll, which allows eye scrolling for the first time. Samsung also added new camera features, S Translator and other Samsung specific features.