#40278D
Closest named color: Imperial Purple (#480CA8). oklch(37.2% 0.158 287.2), rgb(64, 39, 141).
Aa
White text reads best on this color (11.09:1).
About this color
#40278D is a dark, vivid purple. In OKLCH its lightness is 37%, its chroma 0.158 and its hue 287°. Its hue sits on the cool side of the wheel. The nearest named color is Imperial Purple (#480CA8), ΔE 0.053 away. White text reads best on it, at 11.09:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | vivid (0.158) |
| Temperature | cool |
| Nearest name | Imperial Purple (#480CA8) |
| Black text | 1.89:1 |
| White text | 11.09:1 |
Values
| HEX | #40278D |
| RGB | rgb(64, 39, 141) |
| HSL | hsl(255, 57%, 35%) |
| OKLCH | oklch(37.2% 0.158 287.2) |
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 #40278D | 11.09:1 | AAA | Lc -98.9 | Preferred for body text |
| Black text on #40278D | 1.89:1 | Fails | Lc 8.9 | Not readable |
| #40278D text on white | 11.09:1 | AAA | Lc 95.0 | Preferred for body text |
| #40278D text on black | 1.89:1 | Fails | Lc -7.6 | 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
#F4F4FF
oklch(97% 0.015 286.1)
-
Step 100
100
#E8E7FF
oklch(93.6% 0.032 287.7)
-
Step 200
200
#D6D4FF
oklch(88.5% 0.059 287.3)
-
Step 300
300
#BCB7FF
oklch(80.9% 0.101 287.1)
-
Step 400
400
#9C8EFF
oklch(70.8% 0.161 287.2)
-
Step 500
500
#866BFF
oklch(63% 0.211 287.1)
-
Step 600
600
#753FFF
oklch(55.6% 0.261 287.4)
-
Step 700
700
#632CE0
oklch(49.1% 0.245 287.3)
-
Step 800
800
#5028B5
oklch(42.7% 0.204 287.2)
-
Step 900
900 (this color)
#40278D
oklch(37.2% 0.158 287.2)
-
Step 950
950
#261A54
oklch(27.1% 0.1 287.2)
#40278D 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) | #003E90 | 0.077 |
| Deuteranopia (no green cones) | #00398B | 0.074 |
| Tritanopia (no blue cones) | #214257 | 0.130 |
| Achromatopsia (no color) | #3C3C3C | 0.159 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40278D
#40278D
oklch(37.2% 0.158 287.2)
- #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 #40278D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Imperial Purple #480CA8 ΔE 0.053
- Dark Slate Blue #483D8B ΔE 0.054
- Indigo #4B0082 ΔE 0.057
- Blueberry #464196 ΔE 0.063
- Indigo Blue #3A18B1 ΔE 0.063
- Chrysanthemum #560BAD ΔE 0.068
- Sapphire #2138AB ΔE 0.073
- Royal Purple #4B006E ΔE 0.081
Use #40278D 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.