Avastar vs Rigify

Avastar has no write-up on Specifiction yet; its figures are above.

Rigify is a free Blender add-on that generates character armatures by assembling rig components from a metarig template. Users position the metarig bones to match a character and start generation through Blender’s Armature properties. The manual lists Basic Human, Basic Quadruped, Human, Cat, Wolf, Horse, and Shark metarigs. Bundled rig types cover spines, limbs, fingers, faces, and skin, while feature set packages can add custom rig classes. Generation duplicates the metarig, identifies needed rigs, creates instances, and runs their generation methods. The generated rig interface can switch visible bone collections, change custom properties, and convert between IK and FK. A user-provided Python text block can apply customizations after generation, allowing them to be repeated on regeneration. Rigify requires Blender and runs on Linux, macOS, and Windows. It assumes one Blender unit equals one meter. The manual advises keeping the metarig, since removing it or substantially changing the generated rig can interfere with later feature updates or adaptation to breaking Blender changes.