Palm's focus following the Zire and Tungsten PDA lines shifted exclusively to smartphones, where the Palm OS operating system as used on the Treos was becoming dated with both the Palm OS and the Window Mobile versions making minor impact in market share when compared to those of RIM (Blackberry) and Apple (iPhone). In order to try to change this trend Palm had been working on a new web-based operating system (webOS) which was an embedded Linux operating system that hosts a custom user interface built on standard web browser technology and offered genuine multi-tasking capabilities through a card based concept where each application ran as a card and the use of gestures to navigate between cards and perform actions. This platform won much respect from its peers (including praise from Steve Jobs the noted entrepreneur and founder of Apple) but was compromised by some of the shortcuts taken in the hardware for the initial webOS, and indeed Palm's final device offerings, the Palm Pre, and Palm Pixi.