Uncertainty Visualizer is a stand-alone application dedicated to uncertainty visualization. It features two different methods, which respectively map uncertainty to the intensity of a 'fabric' texture pattern or to the blending ratio between a sharp and a blurred display of the model. Input data should be provided as grid slices given in the GSLIB format. Uncertainty Visualizer reproduces the behavior of the UncertaintyViewer plugin dedicated to Gocad, with less features for the uncertainty displays.