#42566A
Closest named color: YInMn Blue (#415A77). oklch(44.5% 0.041 248.8), rgb(66, 86, 106).
Aa
White text reads best on this color (7.57:1).
About this color
#42566A is a dark, muted blue. In OKLCH its lightness is 44%, its chroma 0.041 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is YInMn Blue (#415A77), ΔE 0.022 away. White text reads best on it, at 7.57:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | muted (0.041) |
| Temperature | cool |
| Nearest name | YInMn Blue (#415A77) |
| Black text | 2.77:1 |
| White text | 7.57:1 |
Values
| HEX | #42566A |
| RGB | rgb(66, 86, 106) |
| HSL | hsl(210, 23%, 34%) |
| OKLCH | oklch(44.5% 0.041 248.8) |
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 #42566A | 7.57:1 | AAA | Lc -91.1 | Preferred for body text |
| Black text on #42566A | 2.77:1 | Fails | Lc 17.7 | Dividers and decoration only |
| #42566A text on white | 7.57:1 | AAA | Lc 86.3 | Fine for body text |
| #42566A 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
#F4F6F7
oklch(97.2% 0.003 228.8)
-
Step 100
100
#E6EAEE
oklch(93.5% 0.007 247.9)
-
Step 200
200
#D3DAE2
oklch(88.5% 0.013 251.6)
-
Step 300
300
#B5C2D0
oklch(80.8% 0.024 250.1)
-
Step 400
400
#8EA3B8
oklch(70.6% 0.039 248.4)
-
Step 500
500
#738CA7
oklch(63% 0.05 250.6)
-
Step 600
600
#5B7692
oklch(55.6% 0.054 249.7)
-
Step 700
700
#4A637C
oklch(49% 0.05 248.9)
-
Step 800
800 (this color)
#42566A
oklch(44.5% 0.041 248.8)
-
Step 900
900
#344352
oklch(37.6% 0.032 248.7)
-
Step 950
950
#1F2730
oklch(26.9% 0.02 251.6)
#42566A 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) | #4E566B | 0.017 |
| Deuteranopia (no green cones) | #49526A | 0.015 |
| Tritanopia (no blue cones) | #355B5D | 0.035 |
| Achromatopsia (no color) | #545454 | 0.041 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42566A
#42566A
oklch(44.5% 0.041 248.8)
- #63503B
#63503B
oklch(44.5% 0.041 69.3)
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 #42566A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- YInMn Blue #415A77 ΔE 0.022
- Dusty Grape #545775 ΔE 0.033
- Dusk #4E5481 ΔE 0.045
- Light Navy Blue #2E5A88 ΔE 0.051
- Slate #516572 ΔE 0.052
- Petrol #005F6A ΔE 0.052
- Dark Slate Gray #2F4F4F ΔE 0.055
- Denim #3B638C ΔE 0.059
Use #42566A 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.