#37337E
Closest named color: Dark Slate Blue (#483D8B). oklch(37% 0.123 280.9), rgb(55, 51, 126).
Aa
White text reads best on this color (10.84:1).
About this color
#37337E is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.123 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 10.84:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.93:1 |
| White text | 10.84:1 |
Values
| HEX | #37337E |
| RGB | rgb(55, 51, 126) |
| HSL | hsl(243, 42%, 35%) |
| OKLCH | oklch(37% 0.123 280.9) |
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 #37337E | 10.84:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #37337E | 1.93:1 | Fails | Lc 9.1 | Not readable |
| #37337E text on white | 10.84:1 | AAA | Lc 94.8 | Preferred for body text |
| #37337E text on black | 1.93:1 | Fails | Lc -7.8 | 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 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
#D2D6FB
oklch(88.5% 0.051 280.4)
-
Step 300
300
#B5BAFB
oklch(80.8% 0.092 280.7)
-
Step 400
400
#9194FA
oklch(70.8% 0.147 280.7)
-
Step 500
500
#7975F7
oklch(63.1% 0.189 280.9)
-
Step 600
600
#6459E6
oklch(55.6% 0.206 280.9)
-
Step 700
700
#5448C8
oklch(49.2% 0.191 281)
-
Step 800
800
#443CA1
oklch(42.6% 0.157 280.9)
-
Step 900
900 (this color)
#37337E
oklch(37% 0.123 280.9)
-
Step 950
950
#21204B
oklch(27.1% 0.077 280.9)
#37337E 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) | #004081 | 0.056 |
| Deuteranopia (no green cones) | #003A7C | 0.054 |
| Tritanopia (no blue cones) | #164453 | 0.105 |
| Achromatopsia (no color) | #3D3D3D | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37337E
#37337E
oklch(37% 0.123 280.9)
- #494000
#494000
oklch(36.9% 0.077 100.3)
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 #37337E, 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 0.059
- Blueberry #464196 ΔE 0.059
- Cobalt #1E488F ΔE 0.063
- Marine Blue #01386A ΔE 0.067
- Prussian Blue #1D3557 ΔE 0.079
- Sapphire #2138AB ΔE 0.079
- Light Navy #155084 ΔE 0.082
Use #37337E 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.