| Feature | NaCl Easy Viewer | AutoDesk Design Review | IrfanView | | :--- | :--- | :--- | :--- | | | Yes (Native) | No | No | | Opens CGM | Yes | Yes (Slow) | With plugin (Buggy) | | Measurement accuracy | 0.001 units | 0.01 units | N/A | | Web integration | Yes (Plugin) | No | No | | File size | 45 MB | 450 MB | 4 MB | | Best for | Defense/Maritime | General CAD | Photos |