Reality Keyer is the world’s first and only real-time image based keyer that works on GPU, and it is implemented as a shader inside UE4. Reality Keyer provides spectacular results for keying of contact shadows, transparent objects and sub-pixel details like hair. Zero Density also launched a plugin version of Reality Keyer for Adobe After Effects, which also uses a clean plate of your footage and creates a matte, adjusting tolerance and softness values. Reality Keyer After Effects Plugin is optimized for fixed camera shots with clean plates.
Reality Keyer plugin for After Effects is a few version older than the Reality Keyer inside Reality Ecosystem.