#424D40
Closest named color: Dark Slate Gray (#2F4F4F). oklch(40.6% 0.026 140.8), rgb(66, 77, 64).
Aa
White text reads best on this color (8.87:1).
About this color
#424D40 is a dark close to neutral grey. In OKLCH its lightness is 41%, its chroma 0.026. It has too little chroma to lean warm or cool. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.031 away. White text reads best on it, at 8.87:1.
| Hue family | Neutrals |
| Lightness | dark (41%) |
| Chroma | close to neutral grey (0.026) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.36:1 |
| White text | 8.87:1 |
Values
| HEX | #424D40 |
| RGB | rgb(66, 77, 64) |
| HSL | hsl(111, 9%, 28%) |
| OKLCH | oklch(40.6% 0.026 140.8) |
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 #424D40 | 8.87:1 | AAA | Lc -94.8 | Preferred for body text |
| Black text on #424D40 | 2.36:1 | Fails | Lc 13.6 | Not readable |
| #424D40 text on white | 8.87:1 | AAA | Lc 90.3 | Preferred for body text |
| #424D40 text on black | 2.36:1 | Fails | Lc -12.0 | 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 800.
-
Step 50
50
#F5F6F4
oklch(97.2% 0.003 128.5)
-
Step 100
100
#E8EAE8
oklch(93.5% 0.003 145.5)
-
Step 200
200
#D6DAD5
oklch(88.4% 0.008 139.4)
-
Step 300
300
#BCC3BA
oklch(80.9% 0.015 138.7)
-
Step 400
400
#99A597
oklch(70.8% 0.024 141.2)
-
Step 500
500
#808E7D
oklch(63% 0.03 140.2)
-
Step 600
600
#697866
oklch(55.5% 0.033 140.4)
-
Step 700
700
#576555
oklch(49% 0.03 141.7)
-
Step 800
800 (this color)
#424D40
oklch(40.6% 0.026 140.8)
-
Step 900
900
#3C443A
oklch(37.6% 0.02 139.4)
-
Step 950
950
#232822
oklch(27% 0.013 140.5)
#424D40 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) | #4E4B3F | 0.019 |
| Deuteranopia (no green cones) | #4C4A41 | 0.018 |
| Tritanopia (no blue cones) | #414C49 | 0.016 |
| Achromatopsia (no color) | #4A4A4A | 0.026 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #424D40
#424D40
oklch(40.6% 0.026 140.8)
- #504552
#504552
oklch(40.6% 0.026 321.1)
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 #424D40, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.031
- Charcoal Grey #3C4142 ΔE 0.043
- Dark Blue Green #005249 ΔE 0.055
- Charcoal #264653 ΔE 0.058
- Dark Teal #014D4E ΔE 0.060
- Deep Teal #00555A ΔE 0.061
- Dark Grey Blue #29465B ΔE 0.065
- Pine #2B5D34 ΔE 0.066
Use #424D40 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.