#403D4D
Closest named color: Charcoal Grey (#3C4142). oklch(36.9% 0.027 293.6), rgb(64, 61, 77).
Aa
White text reads best on this color (10.53:1).
About this color
#403D4D is a dark close to neutral grey. In OKLCH its lightness is 37%, its chroma 0.027. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.027 away. White text reads best on it, at 10.53:1.
| Hue family | Neutrals |
| Lightness | dark (37%) |
| Chroma | close to neutral grey (0.027) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 1.99:1 |
| White text | 10.53:1 |
Values
| HEX | #403D4D |
| RGB | rgb(64, 61, 77) |
| HSL | hsl(251, 12%, 27%) |
| OKLCH | oklch(36.9% 0.027 293.6) |
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 #403D4D | 10.53:1 | AAA | Lc -98.4 | Preferred for body text |
| Black text on #403D4D | 1.99:1 | Fails | Lc 9.4 | Not readable |
| #403D4D text on white | 10.53:1 | AAA | Lc 94.5 | Preferred for body text |
| #403D4D text on black | 1.99:1 | Fails | Lc -8.1 | 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
#F5F5F7
oklch(97.1% 0.003 286.4)
-
Step 100
100
#EAE9ED
oklch(93.6% 0.005 297.7)
-
Step 200
200
#D9D8E0
oklch(88.5% 0.011 291.9)
-
Step 300
300
#C1BECD
oklch(80.9% 0.021 295.1)
-
Step 400
400
#A19DB4
oklch(70.7% 0.033 293.5)
-
Step 500
500
#8A85A1
oklch(63.1% 0.042 293.3)
-
Step 600
600
#746F8C
oklch(55.7% 0.045 292.8)
-
Step 700
700
#615C77
oklch(49% 0.043 293.2)
-
Step 800
800
#504C61
oklch(42.9% 0.035 293.6)
-
Step 900
900 (this color)
#403D4D
oklch(36.9% 0.027 293.6)
-
Step 950
950
#27252E
oklch(27% 0.017 295.4)
#403D4D 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) | #3A3F4E | 0.011 |
| Deuteranopia (no green cones) | #3A3F4D | 0.011 |
| Tritanopia (no blue cones) | #3E3F42 | 0.023 |
| Achromatopsia (no color) | #3F3F3F | 0.027 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403D4D
#403D4D
oklch(36.9% 0.027 293.6)
- #3F4131
#3F4131
oklch(36.8% 0.026 113.5)
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 #403D4D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.027
- Onyx #343A40 ΔE 0.032
- Dark Grey Blue #29465B ΔE 0.041
- Charcoal #264653 ΔE 0.042
- Dark Blue Grey #1F3B4D ΔE 0.049
- Gunmetal #293241 ΔE 0.056
- Dark Slate Gray #2F4F4F ΔE 0.060
- Prussian Blue #1D3557 ΔE 0.064
Use #403D4D 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.