#424757
Closest named color: Dark Grey Blue (#29465B). oklch(40% 0.028 271.5), rgb(66, 71, 87).
Aa
White text reads best on this color (9.24:1).
About this color
#424757 is a dark close to neutral grey. In OKLCH its lightness is 40%, its chroma 0.028. It has too little chroma to lean warm or cool. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.035 away. White text reads best on it, at 9.24:1.
| Hue family | Neutrals |
| Lightness | dark (40%) |
| Chroma | close to neutral grey (0.028) |
| Temperature | neutral |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.27:1 |
| White text | 9.24:1 |
Values
| HEX | #424757 |
| RGB | rgb(66, 71, 87) |
| HSL | hsl(226, 14%, 30%) |
| OKLCH | oklch(40% 0.028 271.5) |
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 #424757 | 9.24:1 | AAA | Lc -95.7 | Preferred for body text |
| Black text on #424757 | 2.27:1 | Fails | Lc 12.6 | Not readable |
| #424757 text on white | 9.24:1 | AAA | Lc 91.3 | Preferred for body text |
| #424757 text on black | 2.27:1 | Fails | Lc -11.0 | 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 900.
-
Step 50
50
#F5F5F7
oklch(97.1% 0.003 286.4)
-
Step 100
100
#E8EAEE
oklch(93.7% 0.006 264.5)
-
Step 200
200
#D6D9E1
oklch(88.5% 0.011 269.5)
-
Step 300
300
#BBC0CF
oklch(80.8% 0.022 271.1)
-
Step 400
400
#99A0B6
oklch(70.7% 0.033 271.5)
-
Step 500
500
#8088A4
oklch(63% 0.043 272.6)
-
Step 600
600
#69728F
oklch(55.5% 0.046 271.4)
-
Step 700
700
#58607A
oklch(49.2% 0.043 271.4)
-
Step 800
800
#484E63
oklch(42.7% 0.036 272.4)
-
Step 900
900 (this color)
#424757
oklch(40% 0.028 271.5)
-
Step 950
950
#23262F
oklch(26.9% 0.017 270.7)
#424757 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) | #424858 | 0.003 |
| Deuteranopia (no green cones) | #414757 | 0.002 |
| Tritanopia (no blue cones) | #3D4A4C | 0.025 |
| Achromatopsia (no color) | #474747 | 0.028 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #424757
#424757
oklch(40% 0.028 271.5)
- #4D4737
#4D4737
oklch(39.9% 0.027 89.9)
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 #424757, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.035
- Charcoal Grey #3C4142 ΔE 0.038
- Charcoal #264653 ΔE 0.040
- Dark Slate Gray #2F4F4F ΔE 0.041
- Onyx #343A40 ΔE 0.057
- Dark Teal #014D4E ΔE 0.066
- Deep Teal #00555A ΔE 0.066
- Dark Blue Grey #1F3B4D ΔE 0.067
Use #424757 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.