I like this color generator because it's about accessibility but focuses on data visualization.
It provides:
- In-depth color analysis;
- Precise color control;
- Contrast-ratio-based color generation;
- "Dark mode in seconds";
- Exportable color scales as SVG files for design tools;
- CSS variable and design token outputs;
- Data visualization scales;
- Color-blind safe colors;
- Compare colors for contrast; AND is
- Open source!