#424E5A
Closest named color: Dark Slate Gray (#2F4F4F). oklch(41.8% 0.025 248.4), rgb(66, 78, 90).
Aa
White text reads best on this color (8.50:1).
About this color
#424E5A is a dark close to neutral grey. In OKLCH its lightness is 42%, its chroma 0.025. It has too little chroma to lean warm or cool. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.034 away. White text reads best on it, at 8.50:1.
| Hue family | Neutrals |
| Lightness | dark (42%) |
| Chroma | close to neutral grey (0.025) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.46:1 |
| White text | 8.50:1 |
Values
| HEX | #424E5A |
| RGB | rgb(66, 78, 90) |
| HSL | hsl(210, 15%, 31%) |
| OKLCH | oklch(41.8% 0.025 248.4) |
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 #424E5A | 8.50:1 | AAA | Lc -93.8 | Preferred for body text |
| Black text on #424E5A | 2.46:1 | Fails | Lc 14.7 | Not readable |
| #424E5A text on white | 8.50:1 | AAA | Lc 89.3 | Fine for body text |
| #424E5A text on black | 2.46:1 | 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
#F4F5F7
oklch(97% 0.003 264.5)
-
Step 100
100
#E8EAED
oklch(93.6% 0.005 258.3)
-
Step 200
200
#D5DADE
oklch(88.6% 0.008 241.7)
-
Step 300
300
#B9C2CA
oklch(80.9% 0.015 244.8)
-
Step 400
400
#96A2AF
oklch(70.7% 0.023 250.3)
-
Step 500
500
#7C8B9B
oklch(63% 0.03 250)
-
Step 600
600
#657586
oklch(55.5% 0.033 250)
-
Step 700
700
#536372
oklch(49.2% 0.031 246.7)
-
Step 800
800 (this color)
#424E5A
oklch(41.8% 0.025 248.4)
-
Step 900
900
#3A434C
oklch(37.8% 0.019 248.3)
-
Step 950
950
#22272C
oklch(27% 0.012 248.3)
#424E5A 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) | #494E5B | 0.011 |
| Deuteranopia (no green cones) | #474C5A | 0.009 |
| Tritanopia (no blue cones) | #3B5152 | 0.022 |
| Achromatopsia (no color) | #4D4D4D | 0.025 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #424E5A
#424E5A
oklch(41.8% 0.025 248.4)
- #564A3E
#564A3E
oklch(41.8% 0.025 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 #424E5A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.034
- Dark Grey Blue #29465B ΔE 0.045
- Charcoal #264653 ΔE 0.048
- Charcoal Grey #3C4142 ΔE 0.051
- YInMn Blue #415A77 ΔE 0.052
- Deep Teal #00555A ΔE 0.056
- Dusty Grape #545775 ΔE 0.057
- Dark Teal #014D4E ΔE 0.065
Use #424E5A 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.