Simple Collider is an add-on that automates the generation of physics colliders for export to game engines like Unreal Engine, Unity, and Godot. It supports common primitive shapes including boxes, spheres, capsules, and convex hulls, alongside complex auto-convex decomposition using the V-HACD library. Users can generate colliders in both Object and Edit modes, targeting entire objects, specific geometry selections, or loose parts. The tool features a preset system to manage specific naming conventions required by different game engines and allows for collider generation based on either pre- or post-modifier mesh data.