**Feature Request** Brief title for your desired feature: "ICE" - Interactive Controlled simulation Engine How would you like the feature to work? Similar to leading products with years of development behind them, we are seeing the take up of real-time interactive simulation engines where the user is able to dynamically interact with the circuit to simulate events (buttons, switches, pot adjustments, movement of an inductor to alter the magnetic field, etc) and feedback from the engine (LEDs lighting/occulting), lamps illuminating etc), and some even show circuit current flow and voltage potential levels colourized. Why is this feature important to you? Not just to me! EasyEDA state in their online help: "...a great web based EDA tool for electronics engineers, educators, students, makers and enthusiasts" and "...EasyEDA has all the features you expect and need to rapidly and easily take your design from conception through to production." So to me, EasyEDA is a Rapid Application Development or "RAD" tool that is focused to all levels of competence. Therefore, why would you not want to incorporate these features as they are entirely consistent with the mission and vision set out by EasyEDA. Whats more, with the addition of these features, you really would have the "killer tool" because we love everything else, but in the fast paced world of electronics, to remain competitive and on the front foot, you need to keep innovating and creating. So come on , lets see the introduction of ICE !