#403F4F
Closest named color: Charcoal Grey (#3C4142). oklch(37.5% 0.027 287.9), rgb(64, 63, 79).
Aa
White text reads best on this color (10.28:1).
About this color
#403F4F is a dark close to neutral grey. In OKLCH its lightness is 38%, 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 10.28:1.
| Hue family | Neutrals |
| Lightness | dark (38%) |
| Chroma | close to neutral grey (0.027) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.04:1 |
| White text | 10.28:1 |
Values
| HEX | #403F4F |
| RGB | rgb(64, 63, 79) |
| HSL | hsl(244, 11%, 28%) |
| OKLCH | oklch(37.5% 0.027 287.9) |
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 #403F4F | 10.28:1 | AAA | Lc -97.9 | Preferred for body text |
| Black text on #403F4F | 2.04:1 | Fails | Lc 10.0 | Not readable |
| #403F4F text on white | 10.28:1 | AAA | Lc 93.9 | Preferred for body text |
| #403F4F text on black | 2.04:1 | Fails | Lc -8.6 | 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
#F5F5F7
oklch(97.1% 0.003 286.4)
-
Step 100
100
#E9E9EE
oklch(93.5% 0.007 286.3)
-
Step 200
200
#D8D8E0
oklch(88.5% 0.011 286.2)
-
Step 300
300
#BFBFCD
oklch(80.9% 0.02 286)
-
Step 400
400
#9F9EB4
oklch(70.7% 0.032 287.6)
-
Step 500
500
#8886A2
oklch(63.2% 0.042 288.4)
-
Step 600
600
#716F8D
oklch(55.5% 0.046 287.8)
-
Step 700
700
#5F5D78
oklch(49.1% 0.043 288.1)
-
Step 800
800
#4E4C61
oklch(42.7% 0.035 289.2)
-
Step 900
900 (this color)
#403F4F
oklch(37.5% 0.027 287.9)
-
Step 950
950
#26252F
oklch(27% 0.018 289.7)
#403F4F 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) | #3B4150 | 0.009 |
| Deuteranopia (no green cones) | #3B404F | 0.008 |
| Tritanopia (no blue cones) | #3D4244 | 0.025 |
| Achromatopsia (no color) | #414141 | 0.027 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403F4F
#403F4F
oklch(37.5% 0.027 287.9)
- #424232
#424232
oklch(37.4% 0.026 107.6)
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 #403F4F, 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 0.035
- Dark Grey Blue #29465B ΔE 0.038
- Charcoal #264653 ΔE 0.039
- Dark Blue Grey #1F3B4D ΔE 0.051
- Dark Slate Gray #2F4F4F ΔE 0.055
- Gunmetal #293241 ΔE 0.061
- Prussian Blue #1D3557 ΔE 0.066
Use #403F4F 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.