SignalView is a VST3 plugin for stereo sound visualization. It features a time domain view and a frequency domain view with optional linear or logarithmic display. There is also a sonogram (waterfall) view for observing trends in the spectrum. Left and right signals are represented in separate colors that combine to produce white. SignalView is also available as an LV2 plugin on Linux. To keep the implementation simple, there is no graphical user interface. There are no widgets. Instead, the mouse is used to adjust the display.