#424D4B
Closest named color: Dark Slate Gray (#2F4F4F). oklch(41% 0.014 183.4), rgb(66, 77, 75).
Aa
White text reads best on this color (8.76:1).
About this color
#424D4B is a dark close to neutral grey. In OKLCH its lightness is 41%, its chroma 0.014. It has too little chroma to lean warm or cool. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.025 away. White text reads best on it, at 8.76:1.
| Hue family | Neutrals |
| Lightness | dark (41%) |
| Chroma | close to neutral grey (0.014) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.39:1 |
| White text | 8.76:1 |
Values
| HEX | #424D4B |
| RGB | rgb(66, 77, 75) |
| HSL | hsl(169, 8%, 28%) |
| OKLCH | oklch(41% 0.014 183.4) |
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 #424D4B | 8.76:1 | AAA | Lc -94.5 | Preferred for body text |
| Black text on #424D4B | 2.39:1 | Fails | Lc 13.9 | Not readable |
| #424D4B text on white | 8.76:1 | AAA | Lc 90.0 | Preferred for body text |
| #424D4B text on black | 2.39:1 | Fails | Lc -12.2 | 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
#F5F6F5
oklch(97.2% 0.002 145.6)
-
Step 100
100
#E8EAEA
oklch(93.6% 0.002 197.1)
-
Step 200
200
#D6DAD9
oklch(88.5% 0.005 179.7)
-
Step 300
300
#BBC2C1
oklch(80.8% 0.008 186.8)
-
Step 400
400
#98A3A1
oklch(70.6% 0.013 183.9)
-
Step 500
500
#7F8D8A
oklch(63.1% 0.017 181.5)
-
Step 600
600
#687774
oklch(55.6% 0.018 182.3)
-
Step 700
700
#566462
oklch(49.1% 0.017 186.2)
-
Step 800
800 (this color)
#424D4B
oklch(41% 0.014 183.4)
-
Step 900
900
#3B4442
oklch(37.8% 0.012 180.8)
-
Step 950
950
#232827
oklch(27.1% 0.007 182.4)
#424D4B 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) | #4C4C4B | 0.016 |
| Deuteranopia (no green cones) | #4A4A4B | 0.015 |
| Tritanopia (no blue cones) | #3F4D4C | 0.005 |
| Achromatopsia (no color) | #4B4B4B | 0.015 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
This color is close to neutral, so it has no meaningful hue to rotate. Hue harmonies are omitted.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #424D4B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.025
- Charcoal Grey #3C4142 ΔE 0.040
- Charcoal #264653 ΔE 0.049
- Dark Grey Blue #29465B ΔE 0.053
- Deep Teal #00555A ΔE 0.056
- Dark Teal #014D4E ΔE 0.058
- Dark Blue Green #005249 ΔE 0.058
- Onyx #343A40 ΔE 0.066
Use #424D4B 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.