#37308D
Closest named color: Dark Slate Blue (#483D8B). oklch(37.8% 0.148 280), rgb(55, 48, 141).
Aa
White text reads best on this color (10.66:1).
About this color
#37308D is a dark, vivid blue. In OKLCH its lightness is 38%, its chroma 0.148 and its hue 280°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.046 away. White text reads best on it, at 10.66:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | vivid (0.148) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.96:1 |
| White text | 10.66:1 |
Values
| HEX | #37308D |
| RGB | rgb(55, 48, 141) |
| HSL | hsl(245, 49%, 37%) |
| OKLCH | oklch(37.8% 0.148 280) |
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 #37308D | 10.66:1 | AAA | Lc -98.2 | Preferred for body text |
| Black text on #37308D | 1.96:1 | Fails | Lc 9.7 | Not readable |
| #37308D text on white | 10.66:1 | AAA | Lc 94.2 | Preferred for body text |
| #37308D text on black | 1.96:1 | Fails | Lc -8.3 | 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
#B4BAFF
oklch(80.9% 0.098 280.1)
-
Step 400
400
#8F93FF
oklch(70.7% 0.156 280)
-
Step 500
500
#7673FF
oklch(63.1% 0.202 279.9)
-
Step 600
600
#624DFD
oklch(55.6% 0.247 280)
-
Step 700
700
#523CDD
oklch(49.1% 0.23 279.9)
-
Step 800
800
#4234B2
oklch(42.7% 0.19 279.7)
-
Step 900
900 (this color)
#37308D
oklch(37.8% 0.148 280)
-
Step 950
950
#201D52
oklch(27% 0.094 280.6)
#37308D 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) | #004290 | 0.059 |
| Deuteranopia (no green cones) | #003B8B | 0.054 |
| Tritanopia (no blue cones) | #00475A | 0.125 |
| Achromatopsia (no color) | #3E3E3E | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37308D
#37308D
oklch(37.8% 0.148 280)
- #4C4200
#4C4200
oklch(37.8% 0.078 99.5)
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 #37308D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.046
- Blueberry #464196 ΔE 0.052
- Sapphire #2138AB ΔE 0.058
- Cobalt #1E488F ΔE 0.063
- Indigo Blue #3A18B1 ΔE 0.067
- Imperial Purple #480CA8 ΔE 0.067
- Twilight Blue #0A437A ΔE 0.072
- Indigo #4B0082 ΔE 0.079
Use #37308D 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.