#42576C
Closest named color: YInMn Blue (#415A77). oklch(44.8% 0.043 248.8), rgb(66, 87, 108).
Aa
White text reads best on this color (7.46:1).
About this color
#42576C is a dark, muted blue. In OKLCH its lightness is 45%, its chroma 0.043 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is YInMn Blue (#415A77), ΔE 0.018 away. White text reads best on it, at 7.46:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | muted (0.043) |
| Temperature | cool |
| Nearest name | YInMn Blue (#415A77) |
| Black text | 2.81:1 |
| White text | 7.46:1 |
Values
| HEX | #42576C |
| RGB | rgb(66, 87, 108) |
| HSL | hsl(210, 24%, 34%) |
| OKLCH | oklch(44.8% 0.043 248.8) |
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 #42576C | 7.46:1 | AAA | Lc -90.8 | Preferred for body text |
| Black text on #42576C | 2.81:1 | Fails | Lc 18.1 | Dividers and decoration only |
| #42576C text on white | 7.46:1 | AAA | Lc 85.9 | Fine for body text |
| #42576C text on black | 2.81:1 | Fails | Lc -16.1 | 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
#B5C2D1
oklch(80.9% 0.026 251.9)
-
Step 400
400
#8EA3B9
oklch(70.7% 0.04 249.6)
-
Step 500
500
#718DA8
oklch(63.2% 0.052 247.7)
-
Step 600
600
#5A7693
oklch(55.5% 0.056 249.7)
-
Step 700
700
#49637D
oklch(49% 0.052 248.9)
-
Step 800
800 (this color)
#42576C
oklch(44.8% 0.043 248.8)
-
Step 900
900
#344353
oklch(37.7% 0.034 250.4)
-
Step 950
950
#1E2731
oklch(26.9% 0.023 251.3)
#42576C 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) | #4F576D | 0.019 |
| Deuteranopia (no green cones) | #4A536C | 0.016 |
| Tritanopia (no blue cones) | #345C5E | 0.037 |
| Achromatopsia (no color) | #555555 | 0.043 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42576C
#42576C
oklch(44.8% 0.043 248.8)
- #65513B
#65513B
oklch(44.9% 0.043 69.1)
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 #42576C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- YInMn Blue #415A77 ΔE 0.018
- Dusty Grape #545775 ΔE 0.031
- Dusk #4E5481 ΔE 0.043
- Light Navy Blue #2E5A88 ΔE 0.048
- Slate #516572 ΔE 0.049
- Petrol #005F6A ΔE 0.052
- Denim #3B638C ΔE 0.055
- Dark Slate Gray #2F4F4F ΔE 0.058
Use #42576C 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.