Split Visualizer was made by Stak Digital to allow newer lifters to identify gaps in their intra-workout muscular activation.
The diagram was created by u/me1on for use on the excellent lifter analysis tool Symmetric Strength. If you can contribute and replace the use of the diagram on this site with an open-source version, please let us know!
If you wish to contribute, you can submit issues or pull requests at https://gitlab.com/stak-digital/split-visualiser