#424F5C
Closest named color: Dark Slate Gray (#2F4F4F). oklch(42.1% 0.027 248.5), rgb(66, 79, 92).
Aa
White text reads best on this color (8.38:1).
About this color
#424F5C is a dark close to neutral grey. In OKLCH its lightness is 42%, its chroma 0.027. It has too little chroma to lean warm or cool. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.036 away. White text reads best on it, at 8.38:1.
| Hue family | Neutrals |
| Lightness | dark (42%) |
| Chroma | close to neutral grey (0.027) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.50:1 |
| White text | 8.38:1 |
Values
| HEX | #424F5C |
| RGB | rgb(66, 79, 92) |
| HSL | hsl(210, 16%, 31%) |
| OKLCH | oklch(42.1% 0.027 248.5) |
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 #424F5C | 8.38:1 | AAA | Lc -93.5 | Preferred for body text |
| Black text on #424F5C | 2.50:1 | Fails | Lc 15.1 | Dividers and decoration only |
| #424F5C text on white | 8.38:1 | AAA | Lc 88.9 | Fine for body text |
| #424F5C text on black | 2.50:1 | Fails | Lc -13.3 | 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 800.
-
Step 50
50
#F4F5F7
oklch(97% 0.003 264.5)
-
Step 100
100
#E7EAED
oklch(93.6% 0.005 247.9)
-
Step 200
200
#D5DADF
oklch(88.6% 0.009 247.9)
-
Step 300
300
#B9C2CB
oklch(81% 0.016 248)
-
Step 400
400
#95A2B0
oklch(70.6% 0.025 250.2)
-
Step 500
500
#7A8C9D
oklch(63.2% 0.033 246.8)
-
Step 600
600
#637588
oklch(55.5% 0.037 249.9)
-
Step 700
700
#526373
oklch(49.2% 0.033 246.9)
-
Step 800
800 (this color)
#424F5C
oklch(42.1% 0.027 248.5)
-
Step 900
900
#39434D
oklch(37.8% 0.022 248.4)
-
Step 950
950
#21272D
oklch(26.9% 0.014 248.4)
#424F5C 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) | #4A4F5D | 0.012 |
| Deuteranopia (no green cones) | #474C5C | 0.011 |
| Tritanopia (no blue cones) | #3B5253 | 0.023 |
| Achromatopsia (no color) | #4E4E4E | 0.027 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #424F5C
#424F5C
oklch(42.1% 0.027 248.5)
- #584B3E
#584B3E
oklch(42.2% 0.027 67)
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 #424F5C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.036
- Dark Grey Blue #29465B ΔE 0.047
- YInMn Blue #415A77 ΔE 0.048
- Charcoal #264653 ΔE 0.051
- Dusty Grape #545775 ΔE 0.053
- Charcoal Grey #3C4142 ΔE 0.055
- Deep Teal #00555A ΔE 0.056
- Petrol #005F6A ΔE 0.063
Use #424F5C 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.