#402F81
Closest named color: Dark Slate Blue (#483D8B). oklch(37.4% 0.132 287.8), rgb(64, 47, 129).
Aa
White text reads best on this color (10.81:1).
About this color
#402F81 is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.132 and its hue 288°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.041 away. White text reads best on it, at 10.81:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.94:1 |
| White text | 10.81:1 |
Values
| HEX | #402F81 |
| RGB | rgb(64, 47, 129) |
| HSL | hsl(252, 47%, 35%) |
| OKLCH | oklch(37.4% 0.132 287.8) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #402F81 | 10.81:1 | AAA | Lc -98.6 | Preferred for body text |
| Black text on #402F81 | 1.94:1 | Fails | Lc 9.2 | Not readable |
| #402F81 text on white | 10.81:1 | AAA | Lc 94.7 | Preferred for body text |
| #402F81 text on black | 1.94:1 | Fails | Lc -7.9 | Not readable |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 900.
-
Step 50
50
#F5F4FE
oklch(97.1% 0.013 290.8)
-
Step 100
100
#E8E7FD
oklch(93.5% 0.03 287.9)
-
Step 200
200
#D6D4FC
oklch(88.4% 0.055 287.5)
-
Step 300
300
#BDB7FD
oklch(80.9% 0.098 287.9)
-
Step 400
400
#9D8EFD
oklch(70.8% 0.159 287.8)
-
Step 500
500
#876DFA
oklch(63.1% 0.202 287.7)
-
Step 600
600
#734FE9
oklch(55.5% 0.22 287.7)
-
Step 700
700
#613ECB
oklch(49% 0.205 287.7)
-
Step 800
800
#4F35A4
oklch(42.7% 0.169 287.8)
-
Step 900
900 (this color)
#402F81
oklch(37.4% 0.132 287.8)
-
Step 950
950
#261D4C
oklch(27% 0.083 288.3)
#402F81 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #003F84 | 0.071 |
| Deuteranopia (no green cones) | #003B7F | 0.070 |
| Tritanopia (no blue cones) | #2A4253 | 0.108 |
| Achromatopsia (no color) | #3D3D3D | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #402F81
#402F81
oklch(37.4% 0.132 287.8)
- #454300
#454300
oklch(37.3% 0.08 107.8)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #402F81, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.041
- Blueberry #464196 ΔE 0.057
- Indigo #4B0082 ΔE 0.070
- Cobalt #1E488F ΔE 0.074
- Twilight Blue #0A437A ΔE 0.076
- Imperial Purple #480CA8 ΔE 0.078
- Rebecca Purple #663399 ΔE 0.082
- Sapphire #2138AB ΔE 0.082
Use #402F81 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.