#42477C
Closest named color: Dark Slate Blue (#483D8B). oklch(41.9% 0.088 277.8), rgb(66, 71, 124).
Aa
White text reads best on this color (8.66:1).
About this color
#42477C is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.088 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.040 away. White text reads best on it, at 8.66:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.42:1 |
| White text | 8.66:1 |
Values
| HEX | #42477C |
| RGB | rgb(66, 71, 124) |
| HSL | hsl(235, 31%, 37%) |
| OKLCH | oklch(41.9% 0.088 277.8) |
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 #42477C | 8.66:1 | AAA | Lc -94.1 | Preferred for body text |
| Black text on #42477C | 2.42:1 | Fails | Lc 14.4 | Not readable |
| #42477C text on white | 8.66:1 | AAA | Lc 89.6 | Fine for body text |
| #42477C text on black | 2.42:1 | Fails | Lc -12.6 | 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 800.
-
Step 50
50
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E7E9F4
oklch(93.6% 0.015 277.8)
-
Step 200
200
#D4D8EC
oklch(88.5% 0.028 276.8)
-
Step 300
300
#B8BEE2
oklch(80.9% 0.051 277.7)
-
Step 400
400
#949CD4
oklch(70.7% 0.082 277.8)
-
Step 500
500
#7A83C8
oklch(63.1% 0.104 277.3)
-
Step 600
600
#646BB5
oklch(55.6% 0.114 277.9)
-
Step 700
700
#53599C
oklch(49.1% 0.107 277.8)
-
Step 800
800 (this color)
#42477C
oklch(41.9% 0.088 277.8)
-
Step 900
900
#393D65
oklch(37.6% 0.068 278.2)
-
Step 950
950
#21243B
oklch(26.9% 0.043 277.4)
#42477C 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) | #334E7E | 0.026 |
| Deuteranopia (no green cones) | #2F497B | 0.026 |
| Tritanopia (no blue cones) | #2E525B | 0.078 |
| Achromatopsia (no color) | #4B4B4B | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42477C
#42477C
oklch(41.9% 0.088 277.8)
- #5A4D00
#5A4D00
oklch(42.1% 0.087 98)
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 #42477C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.040
- Twilight #4E518B ΔE 0.041
- Dusk #4E5481 ΔE 0.044
- Dusk Blue #26538D ΔE 0.047
- Blueberry #464196 ΔE 0.049
- Light Navy #155084 ΔE 0.049
- Cobalt #1E488F ΔE 0.051
- Light Navy Blue #2E5A88 ΔE 0.056
Use #42477C 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.