Slate Blue is the CSS named color #6A5ACD — rgb(106, 90, 205), hsl(248, 53%, 58%). Its relative luminance is 0.148, giving 5.31:1 against white and 3.96:1 against black, so it works as a text color on white.
| HEX | #6A5ACD |
|---|---|
| RGB | rgb(106, 90, 205) |
| HSL | hsl(248, 53%, 58%) |
| Relative luminance | 0.1478 |
| Contrast on white | 5.31:1 AA pass |
| Contrast on black | 3.96:1 large text only |
Built by mixing slateblue toward white (four steps) and toward black (four steps) while keeping the hue. Use the shades generator for a different step count or to add harmony sets.
Closest by CIELAB distance (ΔE76). For perceptual matching in a design system, compare in OKLab before locking a token.
slateblue is #6A5ACD, which is rgb(106, 90, 205) and hsl(248, 53%, 58%). It is one of the 148 CSS named colors defined by the CSS Color Module Level 4.
Slate Blue has a relative luminance of 0.148 on a 0–1 scale, so it is a dark color. Against white it scores 5.31:1; against black, 3.96:1.
slateblue reaches 5.31:1 against white, which clears WCAG 2.2 AA for normal text (4.5:1) at any size.