#42438D
Closest named color: Dark Slate Blue (#483D8B). oklch(42.2% 0.12 279.4), rgb(66, 67, 141).
Aa
White text reads best on this color (8.68:1).
About this color
#42438D is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.120 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.017 away. White text reads best on it, at 8.68:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.41:1 |
| White text | 8.68:1 |
Values
| HEX | #42438D |
| RGB | rgb(66, 67, 141) |
| HSL | hsl(239, 36%, 41%) |
| OKLCH | oklch(42.2% 0.12 279.4) |
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 #42438D | 8.68:1 | AAA | Lc -94.1 | Preferred for body text |
| Black text on #42438D | 2.41:1 | Fails | Lc 14.4 | Not readable |
| #42438D text on white | 8.68:1 | AAA | Lc 89.6 | Fine for body text |
| #42438D text on black | 2.41:1 | Fails | Lc -12.7 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E7E9F8
oklch(93.7% 0.02 279.9)
-
Step 200
200
#D3D7F3
oklch(88.5% 0.039 279.1)
-
Step 300
300
#B7BCEE
oklch(80.8% 0.071 280.2)
-
Step 400
400
#9299E5
oklch(70.7% 0.111 279.1)
-
Step 500
500
#797DDE
oklch(63.1% 0.144 279.6)
-
Step 600
600
#6365CB
oklch(55.7% 0.154 279.3)
-
Step 700
700
#5253B0
oklch(49.1% 0.145 279.2)
-
Step 800
800 (this color)
#42438D
oklch(42.2% 0.12 279.4)
-
Step 900
900
#383A72
oklch(37.7% 0.094 279.3)
-
Step 950
950
#212243
oklch(26.9% 0.061 280.2)
#42438D 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) | #1E4E90 | 0.046 |
| Deuteranopia (no green cones) | #15488B | 0.049 |
| Tritanopia (no blue cones) | #235361 | 0.104 |
| Achromatopsia (no color) | #4B4B4B | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42438D
#42438D
oklch(42.2% 0.12 279.4)
- #5A4E00
#5A4E00
oklch(42.3% 0.088 99.1)
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 #42438D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.017
- Blueberry #464196 ΔE 0.017
- Cobalt #1E488F ΔE 0.042
- Twilight #4E518B ΔE 0.046
- Dusk Blue #26538D ΔE 0.051
- Light Navy #155084 ΔE 0.059
- Dusk #4E5481 ΔE 0.060
- Denim Blue #3B5B92 ΔE 0.066
Use #42438D 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.