QuadPen is a retopology add-on for Blender that simplifies the process of creating optimized quad-based meshes. Operating through an interactive modal interface, it allows users to draw quads and guides directly over existing geometry with real-time visual feedback.

The toolset includes features for dynamically adjusting segment density, straightening or re-routing edge flow, and manipulating guides for organic shapes. Additional built-in operations provide instant access to smart vertex merging, quad surface relaxing, and rapid loop cutting without leaving the tool.