#424E57
Closest named color: Dark Slate Gray (#2F4F4F). oklch(41.7% 0.021 240.5), rgb(66, 78, 87).
Aa
White text reads best on this color (8.53:1).
About this color
#424E57 is a dark close to neutral grey. In OKLCH its lightness is 42%, its chroma 0.021. It has too little chroma to lean warm or cool. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.030 away. White text reads best on it, at 8.53:1.
| Hue family | Neutrals |
| Lightness | dark (42%) |
| Chroma | close to neutral grey (0.021) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.45:1 |
| White text | 8.53:1 |
Values
| HEX | #424E57 |
| RGB | rgb(66, 78, 87) |
| HSL | hsl(206, 14%, 30%) |
| OKLCH | oklch(41.7% 0.021 240.5) |
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 #424E57 | 8.53:1 | AAA | Lc -93.9 | Preferred for body text |
| Black text on #424E57 | 2.45:1 | Fails | Lc 14.6 | Not readable |
| #424E57 text on white | 8.53:1 | AAA | Lc 89.4 | Fine for body text |
| #424E57 text on black | 2.45:1 | Fails | Lc -12.9 | 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
#F4F5F6
oklch(97% 0.002 247.8)
-
Step 100
100
#E8EAEC
oklch(93.6% 0.003 247.9)
-
Step 200
200
#D5DADD
oklch(88.5% 0.007 233.7)
-
Step 300
300
#BAC2C8
oklch(81% 0.012 239.9)
-
Step 400
400
#96A3AC
oklch(70.8% 0.02 237.9)
-
Step 500
500
#7C8C98
oklch(63.1% 0.026 240.3)
-
Step 600
600
#657682
oklch(55.6% 0.028 238.8)
-
Step 700
700
#54636E
oklch(49.1% 0.025 239.9)
-
Step 800
800 (this color)
#424E57
oklch(41.7% 0.021 240.5)
-
Step 900
900
#3A434A
oklch(37.7% 0.017 241.4)
-
Step 950
950
#22272B
oklch(26.9% 0.01 242.1)
#424E57 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) | #4A4E57 | 0.012 |
| Deuteranopia (no green cones) | #474B57 | 0.012 |
| Tritanopia (no blue cones) | #3C5051 | 0.016 |
| Achromatopsia (no color) | #4C4C4C | 0.021 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #424E57
#424E57
oklch(41.7% 0.021 240.5)
- #554A41
#554A41
oklch(41.7% 0.021 61.5)
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 #424E57, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.030
- Dark Grey Blue #29465B ΔE 0.046
- Charcoal #264653 ΔE 0.048
- Charcoal Grey #3C4142 ΔE 0.049
- Deep Teal #00555A ΔE 0.055
- YInMn Blue #415A77 ΔE 0.056
- Dusty Grape #545775 ΔE 0.060
- Dark Teal #014D4E ΔE 0.063
Use #424E57 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.