Marvin JS is the newest member of the Marvin product family. The chemical smartness of MarvinSketch has been transferred to this clean, straight-forward, user-oriented web component. This transfer does not mean that developing Marvin JS was a simple copy/paste of features. The extensive potential in the JavaScript technology, especially its adoptability on touch devices, drove us to re-imagine even the most basic drawing features. During the development we tried to find the balance between the robust chemical knowledge and the intuitive usage.