#373D6C
Closest named color: Twilight Blue (#0A437A). oklch(37.8% 0.08 276.4), rgb(55, 61, 108).
Aa
White text reads best on this color (10.26:1).
About this color
#373D6C is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.080 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.048 away. White text reads best on it, at 10.26:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.080) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.04:1 |
| White text | 10.26:1 |
Values
| HEX | #373D6C |
| RGB | rgb(55, 61, 108) |
| HSL | hsl(233, 33%, 32%) |
| OKLCH | oklch(37.8% 0.08 276.4) |
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 #373D6C | 10.26:1 | AAA | Lc -97.8 | Preferred for body text |
| Black text on #373D6C | 2.04:1 | Fails | Lc 10.2 | Not readable |
| #373D6C text on white | 10.26:1 | AAA | Lc 93.7 | Preferred for body text |
| #373D6C text on black | 2.04:1 | Fails | Lc -8.8 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E6E9F6
oklch(93.6% 0.018 275.6)
-
Step 200
200
#D3D8F0
oklch(88.6% 0.033 276.3)
-
Step 300
300
#B6BEE8
oklch(80.9% 0.06 276.5)
-
Step 400
400
#909BDD
oklch(70.6% 0.097 276.3)
-
Step 500
500
#7681D3
oklch(63% 0.124 276.5)
-
Step 600
600
#6069C0
oklch(55.5% 0.134 276.7)
-
Step 700
700
#4F57A6
oklch(49% 0.125 276.4)
-
Step 800
800
#414886
oklch(42.7% 0.102 276.3)
-
Step 900
900 (this color)
#373D6C
oklch(37.8% 0.08 276.4)
-
Step 950
950
#20243F
oklch(27.1% 0.05 276.1)
#373D6C 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) | #2B436E | 0.022 |
| Deuteranopia (no green cones) | #273F6B | 0.022 |
| Tritanopia (no blue cones) | #24474F | 0.071 |
| Achromatopsia (no color) | #414141 | 0.080 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #373D6C
#373D6C
oklch(37.8% 0.08 276.4)
- #4E4100
#4E4100
oklch(37.8% 0.078 96.2)
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 #373D6C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.048
- Dark Grey Blue #29465B ΔE 0.049
- Prussian Blue #1D3557 ΔE 0.058
- Marine Blue #01386A ΔE 0.058
- Dark Slate Blue #483D8B ΔE 0.060
- Charcoal #264653 ΔE 0.062
- Cobalt #1E488F ΔE 0.065
- Dark Blue Grey #1F3B4D ΔE 0.065
Use #373D6C 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.