#40443B
Closest named color: Charcoal Grey (#3C4142). oklch(38% 0.016 126.8), rgb(64, 68, 59).
Aa
White text reads best on this color (9.96:1).
About this color
#40443B is a dark close to neutral grey. In OKLCH its lightness is 38%, its chroma 0.016. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.019 away. White text reads best on it, at 9.96:1.
| Hue family | Neutrals |
| Lightness | dark (38%) |
| Chroma | close to neutral grey (0.016) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.10:1 |
| White text | 9.96:1 |
Values
| HEX | #40443B |
| RGB | rgb(64, 68, 59) |
| HSL | hsl(87, 7%, 25%) |
| OKLCH | oklch(38% 0.016 126.8) |
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 #40443B | 9.96:1 | AAA | Lc -97.3 | Preferred for body text |
| Black text on #40443B | 2.10:1 | Fails | Lc 10.8 | Not readable |
| #40443B text on white | 9.96:1 | AAA | Lc 93.1 | Preferred for body text |
| #40443B text on black | 2.10:1 | Fails | Lc -9.3 | 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
#F5F6F4
oklch(97.2% 0.003 128.5)
-
Step 100
100
#E9EAE8
oklch(93.6% 0.003 128.5)
-
Step 200
200
#D8DAD5
oklch(88.5% 0.007 124.5)
-
Step 300
300
#BEC2BA
oklch(80.9% 0.012 128.6)
-
Step 400
400
#9DA396
oklch(70.7% 0.02 127.3)
-
Step 500
500
#858C7D
oklch(63% 0.023 127.6)
-
Step 600
600
#6F7666
oklch(55.5% 0.026 126.5)
-
Step 700
700
#5D6355
oklch(49% 0.023 126.2)
-
Step 800
800
#4C5145
oklch(42.7% 0.02 125.7)
-
Step 900
900 (this color)
#40443B
oklch(38% 0.016 126.8)
-
Step 950
950
#252722
oklch(26.9% 0.01 124.9)
#40443B 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) | #45433B | 0.009 |
| Deuteranopia (no green cones) | #44433B | 0.007 |
| Tritanopia (no blue cones) | #414341 | 0.012 |
| Achromatopsia (no color) | #434343 | 0.016 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40443B
#40443B
oklch(38% 0.016 126.8)
- #444049
#444049
oklch(37.9% 0.016 305.7)
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 #40443B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.019
- Dark Slate Gray #2F4F4F ΔE 0.042
- Onyx #343A40 ΔE 0.043
- Charcoal #264653 ΔE 0.049
- Dark Grey Blue #29465B ΔE 0.059
- Dark Teal #014D4E ΔE 0.061
- Dark Blue Green #005249 ΔE 0.064
- Dark Blue Grey #1F3B4D ΔE 0.068
Use #40443B 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.