#37396F
Closest named color: Twilight Blue (#0A437A). oklch(37.1% 0.091 279.4), rgb(55, 57, 111).
Aa
White text reads best on this color (10.62:1).
About this color
#37396F is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.091 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.050 away. White text reads best on it, at 10.62:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.97:1 |
| White text | 10.62:1 |
Values
| HEX | #37396F |
| RGB | rgb(55, 57, 111) |
| HSL | hsl(238, 34%, 33%) |
| OKLCH | oklch(37.1% 0.091 279.4) |
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 #37396F | 10.62:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #37396F | 1.97:1 | Fails | Lc 9.4 | Not readable |
| #37396F text on white | 10.62:1 | AAA | Lc 94.5 | Preferred for body text |
| #37396F text on black | 1.97:1 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E7E9F7
oklch(93.7% 0.019 279.5)
-
Step 200
200
#D3D7F3
oklch(88.5% 0.039 279.1)
-
Step 300
300
#B7BDED
oklch(81% 0.068 279.2)
-
Step 400
400
#9299E4
oklch(70.7% 0.11 279.1)
-
Step 500
500
#797EDC
oklch(63.1% 0.14 279.3)
-
Step 600
600
#6365C9
oklch(55.5% 0.152 279.4)
-
Step 700
700
#5253AE
oklch(49% 0.142 279.3)
-
Step 800
800
#43458D
oklch(42.7% 0.117 279)
-
Step 900
900 (this color)
#37396F
oklch(37.1% 0.091 279.4)
-
Step 950
950
#212342
oklch(27.1% 0.057 279.1)
#37396F 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) | #224171 | 0.033 |
| Deuteranopia (no green cones) | #1E3C6E | 0.033 |
| Tritanopia (no blue cones) | #23444E | 0.079 |
| Achromatopsia (no color) | #3E3E3E | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37396F
#37396F
oklch(37.1% 0.091 279.4)
- #4A4000
#4A4000
oklch(37% 0.077 99.2)
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 #37396F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.050
- Dark Slate Blue #483D8B ΔE 0.056
- Marine Blue #01386A ΔE 0.056
- Prussian Blue #1D3557 ΔE 0.058
- Dark Grey Blue #29465B ΔE 0.061
- Cobalt #1E488F ΔE 0.066
- Dark Blue Grey #1F3B4D ΔE 0.072
- Blueberry #464196 ΔE 0.072
Use #37396F 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.