Since 2001, VPixx Technologies has been developing visual testing hardware and software serving researchers and teachers in the fields of vision, psychophysics, electrophysiology, cognition, and fMRI. Our revolutionary DATAPixx data acquisition and graphics system provides vision scientists with a hardware toolbox implementing high performance video, analog I/O, digital I/O, and audio I/O, all with microsecond synchronization to video refresh. Scientists can integrate the DATAPixx into their own ANSI C or MATLAB programs, or take advantage of the high-level VPixx visual testing program. The VPixx application, a result of over twenty years of experience in vision science programming, is the easiest way to generate and present frame-synchronized animated stimuli within the context of a testing paradigm. VPixx provides powerful features which allow scientists and students to easily manage complex dynamic stimuli, and experimental designs, all within a single user-friendly Macintosh application.