#37427C
Closest named color: Dark Slate Blue (#483D8B). oklch(40% 0.098 273.1), rgb(55, 66, 124).
Aa
White text reads best on this color (9.40:1).
About this color
#37427C is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.098 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.039 away. White text reads best on it, at 9.40:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.23:1 |
| White text | 9.40:1 |
Values
| HEX | #37427C |
| RGB | rgb(55, 66, 124) |
| HSL | hsl(230, 39%, 35%) |
| OKLCH | oklch(40% 0.098 273.1) |
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 #37427C | 9.40:1 | AAA | Lc -95.9 | Preferred for body text |
| Black text on #37427C | 2.23:1 | Fails | Lc 12.4 | Not readable |
| #37427C text on white | 9.40:1 | AAA | Lc 91.6 | Preferred for body text |
| #37427C text on black | 2.23:1 | Fails | Lc -10.8 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E5E9F9
oklch(93.6% 0.022 274.7)
-
Step 200
200
#D0D8F5
oklch(88.5% 0.041 273.3)
-
Step 300
300
#B1BEF1
oklch(80.9% 0.074 273.5)
-
Step 400
400
#899BEA
oklch(70.8% 0.118 273.3)
-
Step 500
500
#6D80E3
oklch(63.1% 0.15 273.2)
-
Step 600
600
#5667D1
oklch(55.6% 0.163 273.1)
-
Step 700
700
#4755B5
oklch(49.1% 0.152 273.3)
-
Step 800
800
#3A4693
oklch(42.7% 0.126 273.2)
-
Step 900
900 (this color)
#37427C
oklch(40% 0.098 273.1)
-
Step 950
950
#1D2344
oklch(26.9% 0.062 273.8)
#37427C 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) | #29497E | 0.024 |
| Deuteranopia (no green cones) | #21437B | 0.026 |
| Tritanopia (no blue cones) | #154F59 | 0.087 |
| Achromatopsia (no color) | #464646 | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37427C
#37427C
oklch(40% 0.098 273.1)
- #574600
#574600
oklch(40% 0.082 93)
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 #37427C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.039
- Cobalt #1E488F ΔE 0.040
- Twilight Blue #0A437A ΔE 0.042
- Light Navy #155084 ΔE 0.047
- Blueberry #464196 ΔE 0.050
- Dusk Blue #26538D ΔE 0.052
- Deep Sea Blue #015482 ΔE 0.060
- Twilight #4E518B ΔE 0.061
Use #37427C 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.