#37338B
Closest named color: Dark Slate Blue (#483D8B). oklch(38.1% 0.142 279.3), rgb(55, 51, 139).
Aa
White text reads best on this color (10.45:1).
About this color
#37338B is a dark, vivid blue. In OKLCH its lightness is 38%, its chroma 0.142 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.040 away. White text reads best on it, at 10.45:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | vivid (0.142) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.00:1 |
| White text | 10.45:1 |
Values
| HEX | #37338B |
| RGB | rgb(55, 51, 139) |
| HSL | hsl(243, 46%, 37%) |
| OKLCH | oklch(38.1% 0.142 279.3) |
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 #37338B | 10.45:1 | AAA | Lc -97.9 | Preferred for body text |
| Black text on #37338B | 2.00:1 | Fails | Lc 10.1 | Not readable |
| #37338B text on white | 10.45:1 | AAA | Lc 93.8 | Preferred for body text |
| #37338B text on black | 2.00:1 | Fails | Lc -8.7 | 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 900.
-
Step 50
50
#F3F5FF
oklch(97.2% 0.013 277.1)
-
Step 100
100
#E5E8FF
oklch(93.6% 0.031 279.9)
-
Step 200
200
#D1D6FF
oklch(88.5% 0.057 279.7)
-
Step 300
300
#B3BAFF
oklch(80.8% 0.098 279.5)
-
Step 400
400
#8E93FF
oklch(70.6% 0.156 279.6)
-
Step 500
500
#7573FF
oklch(63% 0.202 279.5)
-
Step 600
600
#6052F7
oklch(55.6% 0.235 279.3)
-
Step 700
700
#5040D7
oklch(49% 0.219 279.3)
-
Step 800
800
#4137AE
oklch(42.7% 0.181 279.2)
-
Step 900
900 (this color)
#37338B
oklch(38.1% 0.142 279.3)
-
Step 950
950
#1F1E51
oklch(27% 0.091 279.3)
#37338B 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) | #00438E | 0.057 |
| Deuteranopia (no green cones) | #003C89 | 0.052 |
| Tritanopia (no blue cones) | #00495A | 0.122 |
| Achromatopsia (no color) | #3F3F3F | 0.142 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37338B
#37338B
oklch(38.1% 0.142 279.3)
- #4D4300
#4D4300
oklch(38.1% 0.079 99.6)
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 #37338B, 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
- Blueberry #464196 ΔE 0.048
- Cobalt #1E488F ΔE 0.057
- Sapphire #2138AB ΔE 0.060
- Twilight Blue #0A437A ΔE 0.066
- Indigo Blue #3A18B1 ΔE 0.073
- Imperial Purple #480CA8 ΔE 0.073
- Marine Blue #01386A ΔE 0.081
Use #37338B 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.