The Extension package (camera_focus_visualizer-1.0.0-extension.zip) is recommended. The regular ZIP is the same add-on for the classic add-on install. Install only one of them.

Blender 4.3 to 5.2. Release testing was done on Windows with 4.3.2, 4.5.9 LTS and 5.2.2 LTS. macOS and Linux are expected to work but were not part of release testing.

No. Everything is drawn as a GPU overlay. No objects, meshes or materials are created, and nothing appears in renders. Display settings are stored with the scene.

Yes. The planes and the heatmap come from the camera's lens settings, so they are the same for both engines. By default the numbers match how Blender scales depth-of-field blur. The Side View PiP shows an EEVEE-based preview when the scene uses Cycles.

It predicts the blur at each surface point from the focal length, f-stop, focus distance and Circle of Confusion. It is a guide, not a render: transparency, volumes, hair interiors, lens breathing and EEVEE's maximum bokeh size are not taken into account.

The planes and labels are light. The heatmap and the Side View PiP add GPU cost in heavy scenes; the PiP is fastest in Solid mode and its refresh rate can be capped with PiP Max FPS in the add-on preferences.

Perspective cameras are fully supported, including anamorphic Aperture Ratio. Orthographic cameras show the Focus plane only. Panoramic, fisheye, custom and per-eye stereo cameras are not supported.

Yes. In the add-on preferences, Update Defaults from Current Scene saves all add-on options. New scenes start with them, and they are kept when you update the add-on.