Object Visibility Checker (OVC) is an add-on that helps prevent rendering errors by identifying objects with mismatched visibility settings. It scans the entire scene to find items that are visible in the viewport but hidden in the render, as well as objects that are hidden in the viewport but enabled for rendering.

The tool presents these mismatched objects in two organized lists, providing a centralized interface to review and update visibility states. This ensures that scene elements are correctly synced before committing to long rendering processes.