RNAMotifContrast Web Service is a browser-based tool that lets RNA researchers compare 3D structural motifs without the technical hurdles that normally come with this kind of work. Behind the scenes it runs Dr. Islam's RNAMotifContrast analysis on the user's chosen structures, then renders the results as interactive 3D models the user can rotate, overlay, color-code, and annotate to study how motifs relate to one another. Sessions can be saved and shared, turning what used to be a specialist workflow into something any researcher can open in a browser and collaborate on.