#42547E
Closest named color: Dusk (#4E5481). oklch(45% 0.073 265.9), rgb(66, 84, 126).
Aa
White text reads best on this color (7.49:1).
About this color
#42547E is a dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.073 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk (#4E5481), ΔE 0.018 away. White text reads best on it, at 7.49:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | moderately saturated (0.073) |
| Temperature | cool |
| Nearest name | Dusk (#4E5481) |
| Black text | 2.80:1 |
| White text | 7.49:1 |
Values
| HEX | #42547E |
| RGB | rgb(66, 84, 126) |
| HSL | hsl(222, 31%, 38%) |
| OKLCH | oklch(45% 0.073 265.9) |
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 #42547E | 7.49:1 | AAA | Lc -90.8 | Preferred for body text |
| Black text on #42547E | 2.80:1 | Fails | Lc 18.0 | Dividers and decoration only |
| #42547E text on white | 7.49:1 | AAA | Lc 86.0 | Fine for body text |
| #42547E text on black | 2.80:1 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E6EAF2
oklch(93.6% 0.012 264.5)
-
Step 200
200
#D2D9E9
oklch(88.5% 0.023 266.9)
-
Step 300
300
#B4C1DD
oklch(81% 0.042 265.7)
-
Step 400
400
#8DA0CC
oklch(70.7% 0.068 266.5)
-
Step 500
500
#7088BF
oklch(63% 0.088 265.8)
-
Step 600
600
#5971AB
oklch(55.5% 0.095 266.3)
-
Step 700
700
#495F93
oklch(49.2% 0.088 265.8)
-
Step 800
800 (this color)
#42547E
oklch(45% 0.073 265.9)
-
Step 900
900
#334160
oklch(37.7% 0.057 265.2)
-
Step 950
950
#1E2638
oklch(27% 0.036 265.6)
#42547E 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) | #455880 | 0.013 |
| Deuteranopia (no green cones) | #3E527D | 0.009 |
| Tritanopia (no blue cones) | #2B5D63 | 0.066 |
| Achromatopsia (no color) | #555555 | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42547E
#42547E
oklch(45% 0.073 265.9)
- #675220
#675220
oklch(44.9% 0.073 86.2)
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 #42547E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk #4E5481 ΔE 0.018
- YInMn Blue #415A77 ΔE 0.024
- Light Navy Blue #2E5A88 ΔE 0.028
- Twilight #4E518B ΔE 0.030
- Dusty Grape #545775 ΔE 0.033
- Denim Blue #3B5B92 ΔE 0.035
- Dusk Blue #26538D ΔE 0.039
- Dusky Blue #475F94 ΔE 0.044
Use #42547E 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.