#403F4C
Closest named color: Charcoal Grey (#3C4142). oklch(37.4% 0.022 288.8), rgb(64, 63, 76).
Aa
White text reads best on this color (10.32:1).
About this color
#403F4C is a dark close to neutral grey. In OKLCH its lightness is 37%, its chroma 0.022. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.022 away. White text reads best on it, at 10.32:1.
| Hue family | Neutrals |
| Lightness | dark (37%) |
| Chroma | close to neutral grey (0.022) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.03:1 |
| White text | 10.32:1 |
Values
| HEX | #403F4C |
| RGB | rgb(64, 63, 76) |
| HSL | hsl(245, 9%, 27%) |
| OKLCH | oklch(37.4% 0.022 288.8) |
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 #403F4C | 10.32:1 | AAA | Lc -98.0 | Preferred for body text |
| Black text on #403F4C | 2.03:1 | Fails | Lc 9.9 | Not readable |
| #403F4C text on white | 10.32:1 | AAA | Lc 94.0 | Preferred for body text |
| #403F4C text on black | 2.03:1 | 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
#E9E9ED
oklch(93.5% 0.005 286.3)
-
Step 200
200
#D9D8DF
oklch(88.5% 0.01 292.8)
-
Step 300
300
#C0BFCB
oklch(80.9% 0.017 289.9)
-
Step 400
400
#9F9EB1
oklch(70.6% 0.027 288.1)
-
Step 500
500
#88879D
oklch(63.2% 0.033 287.5)
-
Step 600
600
#727088
oklch(55.6% 0.037 289)
-
Step 700
700
#605E73
oklch(49.2% 0.033 289.5)
-
Step 800
800
#4E4D5E
oklch(42.8% 0.028 287.9)
-
Step 900
900 (this color)
#403F4C
oklch(37.4% 0.022 288.8)
-
Step 950
950
#26252D
oklch(26.9% 0.015 291.1)
#403F4C 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) | #3C414D | 0.008 |
| Deuteranopia (no green cones) | #3C404C | 0.007 |
| Tritanopia (no blue cones) | #3E4143 | 0.019 |
| Achromatopsia (no color) | #404040 | 0.022 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403F4C
#403F4C
oklch(37.4% 0.022 288.8)
- #414234
#414234
oklch(37.4% 0.023 110.8)
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 #403F4C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.022
- Onyx #343A40 ΔE 0.032
- Charcoal #264653 ΔE 0.039
- Dark Grey Blue #29465B ΔE 0.040
- Dark Blue Grey #1F3B4D ΔE 0.051
- Dark Slate Gray #2F4F4F ΔE 0.053
- Gunmetal #293241 ΔE 0.060
- Prussian Blue #1D3557 ΔE 0.068
Use #403F4C 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.