Easy Smart Blend is a Blender add-on from Blender Procedural for mixing any two materials using procedural smart masks. It comes with 140 procedural materials spanning woods, metals, fabrics, stones, sci-fi panels, organics and more, alongside a set of procedural smart masks. Materials and masks import as thumbnails, so you can browse them and assign a material with a single click.
The workflow starts with a Load Masks & Materials button that brings everything into the panel. You choose a base material, pick a second material from the Blend Material dropdown, then select a smart mask such as Ambient Occlusion, Edge Detection, Normal Direction, Leakage, Smudge, Ground-Height, Scratches or Curvature. Sliders for Scale, Factor, Contrast, Gamma and Offset adjust the blend in real time, and Assign with Smart Mask applies the mix as a live PBR shader.
Easy Smart Blend runs on Blender 4.5 through 5.0 as an extension-compatible add-on, with Cycles and Eevee listed as the render engines used, and it's distributed under the GPL license. A demo video is available.