| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | — | Yes |
| macOS | — | Yes |
| Linux | — | Yes |
| iOS | — | Yes |
| Android | — | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 1 | 1 |
| Spec score · Data Visualization Libraries Software | 7.9 (#10) | 7.8 (#11) |
| Spec score · Data Visualization Software | 7.9 (#52) | 8.1 (#43) |
| Data sources | CSV,JSON | Supported reader/writer file formats include DICOM,BMP,FLUENT,CGNS,and LIDAR formats (among others). |
| Free plan | Yes | Yes |
| Maker | D3 is developed by Observable, and Mike Bostock and Philippe Rivière maintain it. | VTK’s history page says Kitware, Inc. was founded in 1998 by Ken Martin, Will Schroeder, Lisa Avila, Charles Law, and Bill Hoffman. |
| Platform | web | web_and_desktop |
| Purpose | D3 is a free, open-source JavaScript library for creating dynamic, data-driven visualizations. | VTK is open-source software for 3D computer graphics, modeling, image processing, volume rendering, scientific visualization, and 2D plotting. |
| Support | The D3 community page recommends GitHub Discussions as the preferred place for support requests and community engagement. | The project directs users to its Discourse forum and public issue tracker, and lists Kitware consulting for commercial or confidential assistance. |
