| 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 | 8.2 (#7) | 7.8 (#11) |
| Spec score · Data Visualization Software | 8.1 (#40) | 8.1 (#43) |
| Data sources | JavaScript arrays,tuples,objects,data APIs,and Cube | Supported reader/writer file formats include DICOM,BMP,FLUENT,CGNS,and LIDAR formats (among others). |
| Integrations | Chart.js includes TypeScript typings and works with React, Vue, Svelte, and Angular, directly or through wrapper packages. | VTK interoperates with Python and Matplotlib, and its documentation covers use with Jupyter, C++, CMake, JavaScript, and WebAssembly. |
| License | Chart.js is open source under the MIT license and maintained by a community. | VTK is distributed under the OSI-approved BSD 3-clause License, and the project says it is free to use for any purpose. |
| Platform | web | web_and_desktop |
| Purpose | Chart.js is a simple, flexible JavaScript charting library for the modern web. | VTK is open-source software for 3D computer graphics, modeling, image processing, volume rendering, scientific visualization, and 2D plotting. |
| Rendering | Charts render on HTML5 canvas, which the documentation says performs well for large datasets but does not allow CSS styling of chart elements. | VTK provides a rendering abstraction layer over graphics libraries, primarily OpenGL. |
| Support | The documentation directs users to Discord, GitHub Discussions, and Stack Overflow for community help. | The project directs users to its Discourse forum and public issue tracker, and lists Kitware consulting for commercial or confidential assistance. |
