#403E4E
Closest named color: Charcoal Grey (#3C4142). oklch(37.2% 0.027 290.7), rgb(64, 62, 78).
Aa
White text reads best on this color (10.41:1).
About this color
#403E4E 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 10.41:1.
| Hue family | Neutrals |
| Lightness | dark (37%) |
| Chroma | close to neutral grey (0.027) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.01:1 |
| White text | 10.41:1 |
Values
| HEX | #403E4E |
| RGB | rgb(64, 62, 78) |
| HSL | hsl(248, 11%, 27%) |
| OKLCH | oklch(37.2% 0.027 290.7) |
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 #403E4E | 10.41:1 | AAA | Lc -98.2 | Preferred for body text |
| Black text on #403E4E | 2.01:1 | Fails | Lc 9.7 | Not readable |
| #403E4E text on white | 10.41:1 | AAA | Lc 94.2 | Preferred for body text |
| #403E4E text on black | 2.01:1 | Fails | Lc -8.4 | 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
#EAE9EE
oklch(93.6% 0.007 295.4)
-
Step 200
200
#D9D8E0
oklch(88.5% 0.011 291.9)
-
Step 300
300
#C0BFCD
oklch(81% 0.02 289.2)
-
Step 400
400
#A09DB4
oklch(70.6% 0.033 291.5)
-
Step 500
500
#8985A1
oklch(63% 0.042 291.7)
-
Step 600
600
#736F8C
oklch(55.6% 0.045 291.2)
-
Step 700
700
#605D77
oklch(49.1% 0.041 290.1)
-
Step 800
800
#4F4C61
oklch(42.8% 0.035 291.4)
-
Step 900
900 (this color)
#403E4E
oklch(37.2% 0.027 290.7)
-
Step 950
950
#26252E
oklch(26.9% 0.017 290.3)
#403E4E 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) | #3A404F | 0.011 |
| Deuteranopia (no green cones) | #3A3F4E | 0.010 |
| Tritanopia (no blue cones) | #3D4143 | 0.025 |
| Achromatopsia (no color) | #404040 | 0.027 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403E4E
#403E4E
oklch(37.2% 0.027 290.7)
- #414231
#414231
oklch(37.3% 0.028 110.5)
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 #403E4E, 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 0.033
- Dark Grey Blue #29465B ΔE 0.039
- Charcoal #264653 ΔE 0.041
- Dark Blue Grey #1F3B4D ΔE 0.050
- Dark Slate Gray #2F4F4F ΔE 0.057
- Gunmetal #293241 ΔE 0.059
- Prussian Blue #1D3557 ΔE 0.065
Use #403E4E 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.