#403B8B
Closest named color: Dark Slate Blue (#483D8B). oklch(40.4% 0.129 281.8), rgb(64, 59, 139).
Aa
White text reads best on this color (9.47:1).
About this color
#403B8B is a dark, moderately saturated purple. In OKLCH its lightness is 40%, its chroma 0.129 and its hue 282°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.015 away. White text reads best on it, at 9.47:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.21:1 |
| White text | 9.47:1 |
Values
| HEX | #403B8B |
| RGB | rgb(64, 59, 139) |
| HSL | hsl(244, 40%, 39%) |
| OKLCH | oklch(40.4% 0.129 281.8) |
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 #403B8B | 9.47:1 | AAA | Lc -95.9 | Preferred for body text |
| Black text on #403B8B | 2.21:1 | Fails | Lc 12.3 | Not readable |
| #403B8B text on white | 9.47:1 | AAA | Lc 91.6 | Preferred for body text |
| #403B8B text on black | 2.21:1 | Fails | Lc -10.7 | 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 800.
-
Step 50
50
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E7E8F9
oklch(93.5% 0.023 283.3)
-
Step 200
200
#D4D6F5
oklch(88.4% 0.043 282.6)
-
Step 300
300
#B8BBF1
oklch(80.8% 0.076 282.1)
-
Step 400
400
#9597EA
oklch(70.8% 0.12 281.8)
-
Step 500
500
#7C7AE3
oklch(63% 0.155 281.9)
-
Step 600
600
#6761D1
oklch(55.6% 0.167 281.9)
-
Step 700
700
#564FB5
oklch(49% 0.156 282.1)
-
Step 800
800 (this color)
#403B8B
oklch(40.4% 0.129 281.8)
-
Step 900
900
#3A3875
oklch(37.6% 0.102 281.8)
-
Step 950
950
#222144
oklch(26.9% 0.064 282.5)
#403B8B 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) | #03498E | 0.061 |
| Deuteranopia (no green cones) | #004389 | 0.060 |
| Tritanopia (no blue cones) | #214D5D | 0.109 |
| Achromatopsia (no color) | #464646 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403B8B
#403B8B
oklch(40.4% 0.129 281.8)
- #524A00
#524A00
oklch(40.4% 0.085 102.4)
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 #403B8B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.015
- Blueberry #464196 ΔE 0.026
- Cobalt #1E488F ΔE 0.049
- Twilight #4E518B ΔE 0.066
- Twilight Blue #0A437A ΔE 0.067
- Sapphire #2138AB ΔE 0.067
- Dusk Blue #26538D ΔE 0.068
- Light Navy #155084 ΔE 0.071
Use #403B8B 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.