Hair Shape Key is a Blender add-on from VFX Grace that supports adding shape keys to hair and creating transition animation between them. Users can switch between the different shapes freely and keyframe the animation, giving more control over how hair is handled in Blender.
The add-on lets you create hair shapes and build transitions from one to another. It can work with the Noise modifier, and it uses a driver to control animation. It has been used with the Cycles and Eevee render engines.
Hair Shape Key runs on Windows 10 and 11 with Blender 2.81a or above, on Ubuntu 18.04 or 20.04 with Blender 2.81a or above plus GCC 7.4 or above, and on macOS 10.14 or above with Blender 3.3 or above. The latest version adds support for Blender 5.1. Installation goes through Edit, Preferences, Add-ons, Install and selecting the zip file. The add-on is distributed under the GPL license.