#42566B
Closest named color: YInMn Blue (#415A77). oklch(44.5% 0.043 250), rgb(66, 86, 107).
Aa
White text reads best on this color (7.56:1).
About this color
#42566B is a dark, muted blue. In OKLCH its lightness is 45%, its chroma 0.043 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is YInMn Blue (#415A77), ΔE 0.020 away. White text reads best on it, at 7.56:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | muted (0.043) |
| Temperature | cool |
| Nearest name | YInMn Blue (#415A77) |
| Black text | 2.77:1 |
| White text | 7.56:1 |
Values
| HEX | #42566B |
| RGB | rgb(66, 86, 107) |
| HSL | hsl(211, 24%, 34%) |
| OKLCH | oklch(44.5% 0.043 250) |
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 #42566B | 7.56:1 | AAA | Lc -91.1 | Preferred for body text |
| Black text on #42566B | 2.77:1 | Fails | Lc 17.7 | Dividers and decoration only |
| #42566B text on white | 7.56:1 | AAA | Lc 86.3 | Fine for body text |
| #42566B text on black | 2.77:1 | Fails | Lc -15.8 | Dividers and decoration only |
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
#F4F6F8
oklch(97.2% 0.003 247.9)
-
Step 100
100
#E6EAEF
oklch(93.5% 0.008 253.9)
-
Step 200
200
#D2DAE2
oklch(88.5% 0.014 248)
-
Step 300
300
#B5C2D0
oklch(80.8% 0.024 250.1)
-
Step 400
400
#8EA3B9
oklch(70.7% 0.04 249.6)
-
Step 500
500
#728CA8
oklch(63% 0.052 250.5)
-
Step 600
600
#5B7693
oklch(55.6% 0.055 250.6)
-
Step 700
700
#4A637D
oklch(49% 0.052 249.9)
-
Step 800
800 (this color)
#42566B
oklch(44.5% 0.043 250)
-
Step 900
900
#344353
oklch(37.7% 0.034 250.4)
-
Step 950
950
#1F2730
oklch(26.9% 0.02 251.6)
#42566B 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) | #4E566C | 0.017 |
| Deuteranopia (no green cones) | #49526B | 0.015 |
| Tritanopia (no blue cones) | #355B5D | 0.036 |
| Achromatopsia (no color) | #545454 | 0.043 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42566B
#42566B
oklch(44.5% 0.043 250)
- #63503A
#63503A
oklch(44.5% 0.042 70.5)
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 #42566B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- YInMn Blue #415A77 ΔE 0.020
- Dusty Grape #545775 ΔE 0.032
- Dusk #4E5481 ΔE 0.043
- Light Navy Blue #2E5A88 ΔE 0.049
- Slate #516572 ΔE 0.052
- Petrol #005F6A ΔE 0.053
- Dark Slate Gray #2F4F4F ΔE 0.056
- Denim #3B638C ΔE 0.058
Use #42566B 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.