#424559
Closest named color: Dark Grey Blue (#29465B). oklch(39.6% 0.034 278.1), rgb(66, 69, 89).
Aa
White text reads best on this color (9.42:1).
About this color
#424559 is a dark, muted blue. In OKLCH its lightness is 40%, its chroma 0.034 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.034 away. White text reads best on it, at 9.42:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | muted (0.034) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.22:1 |
| White text | 9.42:1 |
Values
| HEX | #424559 |
| RGB | rgb(66, 69, 89) |
| HSL | hsl(232, 15%, 30%) |
| OKLCH | oklch(39.6% 0.034 278.1) |
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 #424559 | 9.42:1 | AAA | Lc -96.1 | Preferred for body text |
| Black text on #424559 | 2.22:1 | Fails | Lc 12.1 | Not readable |
| #424559 text on white | 9.42:1 | AAA | Lc 91.8 | Preferred for body text |
| #424559 text on black | 2.22:1 | Fails | Lc -10.6 | 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 900.
-
Step 50
50
#F5F5F8
oklch(97.1% 0.004 286.3)
-
Step 100
100
#E8E9EF
oklch(93.5% 0.008 278.6)
-
Step 200
200
#D7D8E3
oklch(88.5% 0.015 281.9)
-
Step 300
300
#BCBFD1
oklch(80.8% 0.025 278.3)
-
Step 400
400
#9A9FBA
oklch(70.8% 0.04 277.1)
-
Step 500
500
#8287A9
oklch(63.2% 0.051 278.3)
-
Step 600
600
#6B7095
oklch(55.5% 0.058 278.4)
-
Step 700
700
#595E7F
oklch(49.1% 0.053 277.6)
-
Step 800
800
#494D67
oklch(42.7% 0.043 277.6)
-
Step 900
900 (this color)
#424559
oklch(39.6% 0.034 278.1)
-
Step 950
950
#242631
oklch(27.1% 0.021 276.9)
#424559 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) | #3F475A | 0.007 |
| Deuteranopia (no green cones) | #3E4558 | 0.007 |
| Tritanopia (no blue cones) | #3D494C | 0.030 |
| Achromatopsia (no color) | #464646 | 0.034 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #424559
#424559
oklch(39.6% 0.034 278.1)
- #4B4732
#4B4732
oklch(39.6% 0.034 98.6)
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 #424559, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.034
- Charcoal Grey #3C4142 ΔE 0.040
- Charcoal #264653 ΔE 0.041
- Dark Slate Gray #2F4F4F ΔE 0.048
- Onyx #343A40 ΔE 0.056
- Dark Blue Grey #1F3B4D ΔE 0.064
- Dark Teal #014D4E ΔE 0.070
- YInMn Blue #415A77 ΔE 0.071
Use #424559 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.