Slicer-AR is an interactive visualisation tool designed for exploring 3D medical data such as MRI scans. The app allows users to define custom cross-section planes by simply moving their device, offering a new way to navigate and understand volumetric datasets beyond traditional views. This intuitive approach supports dynamic, real-time exploration of complex anatomical structures, making it ideal for educational, research, and demonstration purposes. Note: This app is not intended for diagnosis or clinical decision-making.