#403B4B
Closest named color: Onyx (#343A40). oklch(36.4% 0.028 299.3), rgb(64, 59, 75).
Aa
White text reads best on this color (10.79:1).
About this color
#403B4B is a dark close to neutral grey. In OKLCH its lightness is 36%, its chroma 0.028. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.029 away. White text reads best on it, at 10.79:1.
| Hue family | Neutrals |
| Lightness | dark (36%) |
| Chroma | close to neutral grey (0.028) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.94:1 |
| White text | 10.79:1 |
Values
| HEX | #403B4B |
| RGB | rgb(64, 59, 75) |
| HSL | hsl(259, 12%, 26%) |
| OKLCH | oklch(36.4% 0.028 299.3) |
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 #403B4B | 10.79:1 | AAA | Lc -98.9 | Preferred for body text |
| Black text on #403B4B | 1.94:1 | Fails | Lc 8.9 | Not readable |
| #403B4B text on white | 10.79:1 | AAA | Lc 95.0 | Preferred for body text |
| #403B4B text on black | 1.94:1 | 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
#F6F5F7
oklch(97.1% 0.003 308.4)
-
Step 100
100
#EAE9ED
oklch(93.6% 0.005 297.7)
-
Step 200
200
#DAD7E0
oklch(88.4% 0.013 301.3)
-
Step 300
300
#C2BECD
oklch(80.9% 0.021 298.1)
-
Step 400
400
#A39CB3
oklch(70.6% 0.034 299.4)
-
Step 500
500
#8D84A0
oklch(63.1% 0.043 299.9)
-
Step 600
600
#776E8B
oklch(55.7% 0.045 299.1)
-
Step 700
700
#645B76
oklch(49% 0.044 300)
-
Step 800
800
#524B60
oklch(42.8% 0.035 300.2)
-
Step 900
900 (this color)
#403B4B
oklch(36.4% 0.028 299.3)
-
Step 950
950
#28252E
oklch(27.2% 0.017 300.5)
#403B4B 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) | #383D4C | 0.014 |
| Deuteranopia (no green cones) | #393D4B | 0.013 |
| Tritanopia (no blue cones) | #3E3D40 | 0.023 |
| Achromatopsia (no color) | #3D3D3D | 0.028 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403B4B
#403B4B
oklch(36.4% 0.028 299.3)
- #3C4030
#3C4030
oklch(36.3% 0.027 119.2)
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 #403B4B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.029
- Charcoal Grey #3C4142 ΔE 0.029
- Dark Grey Blue #29465B ΔE 0.046
- Charcoal #264653 ΔE 0.046
- Dark Blue Grey #1F3B4D ΔE 0.048
- Gunmetal #293241 ΔE 0.052
- Space Cadet #2B2D42 ΔE 0.061
- Prussian Blue #1D3557 ΔE 0.062
Use #403B4B 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.