#37417B
Closest named color: Dark Slate Blue (#483D8B). oklch(39.7% 0.098 273.7), rgb(55, 65, 123).
Aa
White text reads best on this color (9.52:1).
About this color
#37417B is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.098 and its hue 274°. 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 9.52:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.20:1 |
| White text | 9.52:1 |
Values
| HEX | #37417B |
| RGB | rgb(55, 65, 123) |
| HSL | hsl(231, 38%, 35%) |
| OKLCH | oklch(39.7% 0.098 273.7) |
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 #37417B | 9.52:1 | AAA | Lc -96.2 | Preferred for body text |
| Black text on #37417B | 2.20:1 | Fails | Lc 12.1 | Not readable |
| #37417B text on white | 9.52:1 | AAA | Lc 91.9 | Preferred for body text |
| #37417B text on black | 2.20:1 | Fails | Lc -10.5 | 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
#8A9BEA
oklch(70.8% 0.117 273.8)
-
Step 500
500
#6E80E3
oklch(63.2% 0.149 273.6)
-
Step 600
600
#5767D1
oklch(55.6% 0.163 273.5)
-
Step 700
700
#4855B5
oklch(49.2% 0.151 273.7)
-
Step 800
800
#3B4693
oklch(42.8% 0.126 273.7)
-
Step 900
900 (this color)
#37417B
oklch(39.7% 0.098 273.7)
-
Step 950
950
#1D2344
oklch(26.9% 0.062 273.8)
#37417B 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) | #28487D | 0.025 |
| Deuteranopia (no green cones) | #20437A | 0.027 |
| Tritanopia (no blue cones) | #174E58 | 0.087 |
| Achromatopsia (no color) | #454545 | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37417B
#37417B
oklch(39.7% 0.098 273.7)
- #564500
#564500
oklch(39.7% 0.081 92.8)
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 #37417B, 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
- Twilight Blue #0A437A ΔE 0.042
- Cobalt #1E488F ΔE 0.042
- Light Navy #155084 ΔE 0.050
- Blueberry #464196 ΔE 0.051
- Dusk Blue #26538D ΔE 0.055
- Deep Sea Blue #015482 ΔE 0.062
- Twilight #4E518B ΔE 0.064
Use #37417B 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.