#37347D
Closest named color: Dark Slate Blue (#483D8B). oklch(37.2% 0.12 280.7), rgb(55, 52, 125).
Aa
White text reads best on this color (10.77:1).
About this color
#37347D is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.120 and its hue 281°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.045 away. White text reads best on it, at 10.77:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.94:1 |
| White text | 10.77:1 |
Values
| HEX | #37347D |
| RGB | rgb(55, 52, 125) |
| HSL | hsl(242, 41%, 35%) |
| OKLCH | oklch(37.2% 0.12 280.7) |
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 #37347D | 10.77:1 | AAA | Lc -98.6 | Preferred for body text |
| Black text on #37347D | 1.94:1 | Fails | Lc 9.2 | Not readable |
| #37347D text on white | 10.77:1 | AAA | Lc 94.7 | Preferred for body text |
| #37347D text on black | 1.94:1 | Fails | Lc -7.9 | 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 900.
-
Step 50
50
#F4F5FE
oklch(97.2% 0.012 281.1)
-
Step 100
100
#E6E8FC
oklch(93.5% 0.027 281.3)
-
Step 200
200
#D2D6FA
oklch(88.4% 0.05 280.3)
-
Step 300
300
#B5BAFA
oklch(80.8% 0.09 280.7)
-
Step 400
400
#9194F8
oklch(70.7% 0.145 280.7)
-
Step 500
500
#7976F4
oklch(63.1% 0.183 280.8)
-
Step 600
600
#645BE3
oklch(55.7% 0.199 280.7)
-
Step 700
700
#5349C5
oklch(49% 0.186 280.7)
-
Step 800
800
#443DA0
oklch(42.7% 0.155 280.8)
-
Step 900
900 (this color)
#37347D
oklch(37.2% 0.12 280.7)
-
Step 950
950
#21204A
oklch(27% 0.076 281.1)
#37347D 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) | #00407F | 0.055 |
| Deuteranopia (no green cones) | #003B7B | 0.053 |
| Tritanopia (no blue cones) | #174553 | 0.103 |
| Achromatopsia (no color) | #3E3E3E | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37347D
#37347D
oklch(37.2% 0.12 280.7)
- #494100
#494100
oklch(37.2% 0.078 101.5)
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 #37347D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.045
- Twilight Blue #0A437A ΔE 0.057
- Blueberry #464196 ΔE 0.059
- Cobalt #1E488F ΔE 0.061
- Marine Blue #01386A ΔE 0.066
- Prussian Blue #1D3557 ΔE 0.077
- Light Navy #155084 ΔE 0.080
- Sapphire #2138AB ΔE 0.081
Use #37347D 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.