#403E47
Closest named color: Charcoal Grey (#3C4142). oklch(36.9% 0.015 295.8), rgb(64, 62, 71).
Aa
White text reads best on this color (10.51:1).
About this color
#403E47 is a dark close to neutral grey. In OKLCH its lightness is 37%, its chroma 0.015. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.016 away. White text reads best on it, at 10.51:1.
| Hue family | Neutrals |
| Lightness | dark (37%) |
| Chroma | close to neutral grey (0.015) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 1.99:1 |
| White text | 10.51:1 |
Values
| HEX | #403E47 |
| RGB | rgb(64, 62, 71) |
| HSL | hsl(253, 7%, 26%) |
| OKLCH | oklch(36.9% 0.015 295.8) |
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 #403E47 | 10.51:1 | AAA | Lc -98.4 | Preferred for body text |
| Black text on #403E47 | 1.99:1 | Fails | Lc 9.5 | Not readable |
| #403E47 text on white | 10.51:1 | AAA | Lc 94.4 | Preferred for body text |
| #403E47 text on black | 1.99:1 | Fails | Lc -8.2 | 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
#F5F5F6
oklch(97% 0.001 286.4)
-
Step 100
100
#EAE9EC
oklch(93.6% 0.004 301.4)
-
Step 200
200
#D9D8DD
oklch(88.4% 0.007 295.4)
-
Step 300
300
#C1BFC7
oklch(80.9% 0.011 297.6)
-
Step 400
400
#A19EAB
oklch(70.6% 0.019 296.5)
-
Step 500
500
#8A8797
oklch(63.1% 0.024 294.3)
-
Step 600
600
#747181
oklch(55.7% 0.025 294.2)
-
Step 700
700
#625E6D
oklch(49.1% 0.024 297.7)
-
Step 800
800
#504D59
oklch(42.8% 0.02 297)
-
Step 900
900 (this color)
#403E47
oklch(36.9% 0.015 295.8)
-
Step 950
950
#27262B
oklch(27.2% 0.009 294.9)
#403E47 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) | #3C3F47 | 0.007 |
| Deuteranopia (no green cones) | #3D3F47 | 0.006 |
| Tritanopia (no blue cones) | #3F3F41 | 0.012 |
| Achromatopsia (no color) | #3F3F3F | 0.016 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403E47
#403E47
oklch(36.9% 0.015 295.8)
- #3F4137
#3F4137
oklch(37% 0.017 116.4)
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 #403E47, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.016
- Onyx #343A40 ΔE 0.027
- Charcoal #264653 ΔE 0.041
- Dark Grey Blue #29465B ΔE 0.045
- Dark Blue Grey #1F3B4D ΔE 0.051
- Dark Slate Gray #2F4F4F ΔE 0.055
- Gunmetal #293241 ΔE 0.057
- Midnight Green #073B4C ΔE 0.068
Use #403E47 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.