PyVMEC can be used to design, run and pre-process simple visuomotor rotation experiments. It is not completed yet, but since enough parts of it work we've decided to start making a home for it here. We've designed the PyVMEC for three purposes: 1. As replacement for the Matlab-based VMEC we used in a course. The GitHub page is added as a component here. Ease of use and quick pre-processing of data were important. 2. To easily run some experiments on our tablet setups, as well as laptops to have portable experiments. This means we do want to have the best quality data that can be achieved given the hardware, and we added some features like flipping the screen for a mirrored setup. We intend to also allow using external monitors at some point. 3. To create experiment definitions - stored as JSON file - that can be shared with researchers elsewhere to ensure they run the exact same experiment. There is now a second compiled version available that includes an experimental feature to disable the wait for blanking in the underlying PsychoPy code. On some NVidia graphics cards with specific versions of their drivers, both the graphics card and PsychoPy will wait for the screen to blank before doing anything, which effectively halves the refresh rate and sampling rate. Only use this version (and option) if you are sure that this is an issue on your hardware. It is in the file 'PyVMEC-waitblanking.zip'.