ShapeKeyGen is a Blender addon that automates the creation of shape keys for characters, making them compatible with iClone and Character Creator 4 expression sliders. The tool aims to replace the manual process of creating individual facial expression shape keys.

The addon requires characters to be rigged with either MetaRig or Auto-Rig Pro. It relies on standard bone naming conventions from these systems to function correctly; altering default bone names (e.g., renaming 'jaw_bone') will break the generation process. The developer notes that the results are most effective for stylized, cartoon, or semi-realistic characters.