Hold down the shift key to darken or lighten in bigger steps.
This tool evaluates the contrast between colors in a palette, to make it easier to create UI that meets Web Content Accessibility Guidelines for color contrast. Unlike most other available tools, it evaluates a full palette rather than a single pair of colors, and it loads and saves files used with common design programs.
Use the top menu buttons to load and save color palettes. Colors are limited to solid colors; no transparency, pattern fills or gradients. Supported formats include:
To add an individual color, click on the ‘add color’ button at the top left of the main content area. You can enter RGB or hex values.
To change a color, click on the label at the left or top of the main content area. You can make the color darker or lighter, or directly change its value.