#424C55
Closest named color: Dark Slate Gray (#2F4F4F). oklch(41.1% 0.02 245.5), rgb(66, 76, 85).
Aa
White text reads best on this color (8.76:1).
About this color
#424C55 is a dark close to neutral grey. In OKLCH its lightness is 41%, its chroma 0.020. 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 8.76:1.
| Hue family | Neutrals |
| Lightness | dark (41%) |
| Chroma | close to neutral grey (0.020) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.39:1 |
| White text | 8.76:1 |
Values
| HEX | #424C55 |
| RGB | rgb(66, 76, 85) |
| HSL | hsl(208, 13%, 30%) |
| OKLCH | oklch(41.1% 0.02 245.5) |
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 #424C55 | 8.76:1 | AAA | Lc -94.5 | Preferred for body text |
| Black text on #424C55 | 2.39:1 | Fails | Lc 14.0 | Not readable |
| #424C55 text on white | 8.76:1 | AAA | Lc 90.0 | Preferred for body text |
| #424C55 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
#F4F5F6
oklch(97% 0.002 247.8)
-
Step 100
100
#E8EAEC
oklch(93.6% 0.003 247.9)
-
Step 200
200
#D6DADD
oklch(88.6% 0.006 239.8)
-
Step 300
300
#BBC1C8
oklch(80.8% 0.012 252.1)
-
Step 400
400
#97A2AC
oklch(70.7% 0.019 245.5)
-
Step 500
500
#7E8B97
oklch(63% 0.024 246)
-
Step 600
600
#677582
oklch(55.5% 0.026 246.3)
-
Step 700
700
#56626E
oklch(49% 0.024 248.3)
-
Step 800
800 (this color)
#424C55
oklch(41.1% 0.02 245.5)
-
Step 900
900
#3B4349
oklch(37.8% 0.015 240.3)
-
Step 950
950
#23272B
oklch(27% 0.009 248.2)
#424C55 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) | #494C55 | 0.011 |
| Deuteranopia (no green cones) | #464A55 | 0.008 |
| Tritanopia (no blue cones) | #3D4E4F | 0.016 |
| Achromatopsia (no color) | #4B4B4B | 0.020 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #424C55
#424C55
oklch(41.1% 0.02 245.5)
- #524940
#524940
oklch(41.2% 0.019 67.3)
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 #424C55, 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
- Charcoal Grey #3C4142 ΔE 0.043
- Dark Grey Blue #29465B ΔE 0.043
- Charcoal #264653 ΔE 0.044
- Deep Teal #00555A ΔE 0.057
- YInMn Blue #415A77 ΔE 0.061
- Dark Teal #014D4E ΔE 0.061
- Dusty Grape #545775 ΔE 0.065
Use #424C55 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.