#37239F
Closest named color: Indigo Blue (#3A18B1). oklch(37.6% 0.186 279.9), rgb(55, 35, 159).
Aa
White text reads best on this color (11.03:1).
About this color
#37239F is a dark, vivid blue. In OKLCH its lightness is 38%, its chroma 0.186 and its hue 280°. Its hue sits on the cool side of the wheel. The nearest named color is Indigo Blue (#3A18B1), ΔE 0.031 away. White text reads best on it, at 11.03:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | vivid (0.186) |
| Temperature | cool |
| Nearest name | Indigo Blue (#3A18B1) |
| Black text | 1.90:1 |
| White text | 11.03:1 |
Values
| HEX | #37239F |
| RGB | rgb(55, 35, 159) |
| HSL | hsl(250, 64%, 38%) |
| OKLCH | oklch(37.6% 0.186 279.9) |
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 #37239F | 11.03:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #37239F | 1.90:1 | Fails | Lc 9.4 | Not readable |
| #37239F text on white | 11.03:1 | AAA | Lc 94.5 | Preferred for body text |
| #37239F text on black | 1.90:1 | Fails | Lc -8.1 | 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
#624CFF
oklch(55.6% 0.251 280)
-
Step 700
700
#5514FC
oklch(49.2% 0.288 279.9)
-
Step 800
800
#441BCB
oklch(42.7% 0.239 279.9)
-
Step 900
900 (this color)
#37239F
oklch(37.6% 0.186 279.9)
-
Step 950
950
#1F185D
oklch(27% 0.117 279.7)
#37239F 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) | #0040A3 | 0.069 |
| Deuteranopia (no green cones) | #00379D | 0.059 |
| Tritanopia (no blue cones) | #004760 | 0.149 |
| Achromatopsia (no color) | #3C3C3C | 0.187 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37239F
#37239F
oklch(37.6% 0.186 279.9)
- #4B4200
#4B4200
oklch(37.7% 0.078 100.6)
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 #37239F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Indigo Blue #3A18B1 ΔE 0.031
- Imperial Purple #480CA8 ΔE 0.038
- Sapphire #2138AB ΔE 0.050
- Ultramarine #2000B1 ΔE 0.060
- Chrysanthemum #560BAD ΔE 0.063
- Royal #0C1793 ΔE 0.070
- Blueberry #464196 ΔE 0.073
- Dark Slate Blue #483D8B ΔE 0.074
Use #37239F 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.