We present e-Stress3D, a web-based educational tool designed to enhance the learning of Solid Mechanics in undergraduate and graduate engineering curricula. The application enables interactive visualization of the 3D stress tensor, integrating mathematical formulations with graphical representations. Key features include stress decomposition into isotropic and deviatoric components with their invariants, a dedicated module for Cauchy traction vector analysis on arbitrary planes, visualization of principal stresses, and construction of the 3D Mohr’s circle. The platform supports real-time manipulation of input parameters and provides immediate visual feedback. This interactivity promotes a deeper and more intuitive understanding of fundamental concepts. Overall, the tool contributes to the growing integration of digital tools in engineering education, responding to the increasing demand for more engaging and effective pedagogical approaches.