#42477F
Closest named color: Dark Slate Blue (#483D8B). oklch(42.1% 0.093 277.8), rgb(66, 71, 127).
Aa
White text reads best on this color (8.60:1).
About this color
#42477F is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.093 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.036 away. White text reads best on it, at 8.60:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.43:1 |
| White text | 8.60:1 |
Values
| HEX | #42477F |
| RGB | rgb(66, 71, 127) |
| HSL | hsl(235, 32%, 38%) |
| OKLCH | oklch(42.1% 0.093 277.8) |
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 #42477F | 8.60:1 | AAA | Lc -94.0 | Preferred for body text |
| Black text on #42477F | 2.43:1 | Fails | Lc 14.5 | Not readable |
| #42477F text on white | 8.60:1 | AAA | Lc 89.5 | Fine for body text |
| #42477F text on black | 2.43:1 | Fails | Lc -12.8 | 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
#E7E9F5
oklch(93.6% 0.016 278.5)
-
Step 200
200
#D4D8ED
oklch(88.6% 0.029 277.2)
-
Step 300
300
#B8BEE4
oklch(80.9% 0.054 278.1)
-
Step 400
400
#939CD6
oklch(70.7% 0.085 277.2)
-
Step 500
500
#7A82CC
oklch(63.1% 0.111 278)
-
Step 600
600
#636AB8
oklch(55.5% 0.12 277.8)
-
Step 700
700
#52589F
oklch(49% 0.113 277.7)
-
Step 800
800 (this color)
#42477F
oklch(42.1% 0.093 277.8)
-
Step 900
900
#393D67
oklch(37.7% 0.072 278.2)
-
Step 950
950
#21243D
oklch(27% 0.047 277.6)
#42477F 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) | #314E81 | 0.028 |
| Deuteranopia (no green cones) | #2D4A7E | 0.028 |
| Tritanopia (no blue cones) | #2C535D | 0.081 |
| Achromatopsia (no color) | #4C4C4C | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42477F
#42477F
oklch(42.1% 0.093 277.8)
- #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 #42477F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.036
- Twilight #4E518B ΔE 0.039
- Dusk #4E5481 ΔE 0.044
- Blueberry #464196 ΔE 0.044
- Dusk Blue #26538D ΔE 0.046
- Cobalt #1E488F ΔE 0.048
- Light Navy #155084 ΔE 0.049
- Light Navy Blue #2E5A88 ΔE 0.056
Use #42477F 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.