#403181
Closest named color: Dark Slate Blue (#483D8B). oklch(37.7% 0.129 287.1), rgb(64, 49, 129).
Aa
White text reads best on this color (10.63:1).
About this color
#403181 is a dark, moderately saturated purple. In OKLCH its lightness is 38%, its chroma 0.129 and its hue 287°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.037 away. White text reads best on it, at 10.63:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.97:1 |
| White text | 10.63:1 |
Values
| HEX | #403181 |
| RGB | rgb(64, 49, 129) |
| HSL | hsl(251, 45%, 35%) |
| OKLCH | oklch(37.7% 0.129 287.1) |
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 #403181 | 10.63:1 | AAA | Lc -98.3 | Preferred for body text |
| Black text on #403181 | 1.97:1 | Fails | Lc 9.6 | Not readable |
| #403181 text on white | 10.63:1 | AAA | Lc 94.3 | Preferred for body text |
| #403181 text on black | 1.97:1 | Fails | Lc -8.3 | 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
#E8E7FC
oklch(93.5% 0.028 288)
-
Step 200
200
#D6D4FC
oklch(88.4% 0.055 287.5)
-
Step 300
300
#BCB7FC
oklch(80.8% 0.097 287.3)
-
Step 400
400
#9C8FFB
oklch(70.7% 0.155 287.3)
-
Step 500
500
#866EF8
oklch(63% 0.198 287.3)
-
Step 600
600
#7251E7
oklch(55.6% 0.215 287.3)
-
Step 700
700
#6040C9
oklch(49.1% 0.2 287.3)
-
Step 800
800
#4E36A3
oklch(42.7% 0.167 287.2)
-
Step 900
900 (this color)
#403181
oklch(37.7% 0.129 287.1)
-
Step 950
950
#251E4B
oklch(27% 0.08 286.9)
#403181 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) | #004084 | 0.070 |
| Deuteranopia (no green cones) | #003C7F | 0.069 |
| Tritanopia (no blue cones) | #2A4454 | 0.107 |
| Achromatopsia (no color) | #3E3E3E | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403181
#403181
oklch(37.7% 0.129 287.1)
- #474400
#474400
oklch(37.7% 0.081 106.8)
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 #403181, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.037
- Blueberry #464196 ΔE 0.053
- Cobalt #1E488F ΔE 0.070
- Twilight Blue #0A437A ΔE 0.073
- Indigo #4B0082 ΔE 0.074
- Imperial Purple #480CA8 ΔE 0.081
- Rebecca Purple #663399 ΔE 0.081
- Sapphire #2138AB ΔE 0.081
Use #403181 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.