#424A51
Closest named color: Dark Slate Gray (#2F4F4F). oklch(40.5% 0.016 244.6), rgb(66, 74, 81).
Aa
White text reads best on this color (9.01:1).
About this color
#424A51 is a dark close to neutral grey. In OKLCH its lightness is 40%, its chroma 0.016. 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 9.01:1.
| Hue family | Neutrals |
| Lightness | dark (40%) |
| Chroma | close to neutral grey (0.016) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.32:1 |
| White text | 9.01:1 |
Values
| HEX | #424A51 |
| RGB | rgb(66, 74, 81) |
| HSL | hsl(208, 10%, 29%) |
| OKLCH | oklch(40.5% 0.016 244.6) |
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 #424A51 | 9.01:1 | AAA | Lc -95.1 | Preferred for body text |
| Black text on #424A51 | 2.32:1 | Fails | Lc 13.2 | Not readable |
| #424A51 text on white | 9.01:1 | AAA | Lc 90.7 | Preferred for body text |
| #424A51 text on black | 2.32:1 | Fails | Lc -11.6 | 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
#F5F5F6
oklch(97% 0.001 286.4)
-
Step 100
100
#E8EAEB
oklch(93.6% 0.003 228.8)
-
Step 200
200
#D6D9DC
oklch(88.4% 0.005 247.9)
-
Step 300
300
#BCC1C6
oklch(80.8% 0.009 247.9)
-
Step 400
400
#99A2A9
oklch(70.7% 0.014 241)
-
Step 500
500
#808B94
oklch(63.1% 0.019 242.6)
-
Step 600
600
#6A757F
oklch(55.7% 0.02 245.6)
-
Step 700
700
#58626B
oklch(49.1% 0.019 245.3)
-
Step 800
800 (this color)
#424A51
oklch(40.5% 0.016 244.6)
-
Step 900
900
#3C4248
oklch(37.6% 0.013 248.2)
-
Step 950
950
#23272A
oklch(27% 0.008 240.2)
#424A51 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) | #474A51 | 0.008 |
| Deuteranopia (no green cones) | #454851 | 0.008 |
| Tritanopia (no blue cones) | #3E4C4C | 0.014 |
| Achromatopsia (no color) | #494949 | 0.016 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #424A51
#424A51
oklch(40.5% 0.016 244.6)
- #4F4740
#4F4740
oklch(40.4% 0.016 63.6)
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 #424A51, 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 0.035
- Charcoal #264653 ΔE 0.041
- Dark Grey Blue #29465B ΔE 0.042
- Deep Teal #00555A ΔE 0.059
- Onyx #343A40 ΔE 0.059
- Dark Teal #014D4E ΔE 0.060
- Dark Blue Green #005249 ΔE 0.065
Use #424A51 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.