Select Sim is a selection tool for Edit Mode that identifies similar faces or edges using a shape-based hash calculation. Unlike Blender's native Select Similar operator, which relies on single metrics like area or vertex count, this add-on evaluates a combination of edge angles and face lengths to find matching geometry. The tool includes a Nearby Face Checking feature that refines selections by analyzing the surrounding connected topology. Users can adjust the Face Check Level parameter to restrict matches to areas with identical neighboring faces.