#373C84
Closest named color: Dark Slate Blue (#483D8B). oklch(39.3% 0.119 276.5), rgb(55, 60, 132).
Aa
White text reads best on this color (9.80:1).
About this color
#373C84 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.119 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.030 away. White text reads best on it, at 9.80:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.14:1 |
| White text | 9.80:1 |
Values
| HEX | #373C84 |
| RGB | rgb(55, 60, 132) |
| HSL | hsl(236, 41%, 37%) |
| OKLCH | oklch(39.3% 0.119 276.5) |
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 #373C84 | 9.80:1 | AAA | Lc -96.7 | Preferred for body text |
| Black text on #373C84 | 2.14:1 | Fails | Lc 11.5 | Not readable |
| #373C84 text on white | 9.80:1 | AAA | Lc 92.5 | Preferred for body text |
| #373C84 text on black | 2.14:1 | Fails | Lc -10.0 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E5E9FC
oklch(93.7% 0.026 276.4)
-
Step 200
200
#D0D7FB
oklch(88.5% 0.05 276.6)
-
Step 300
300
#B1BCFA
oklch(80.9% 0.089 276.4)
-
Step 400
400
#8A97F8
oklch(70.8% 0.142 276.4)
-
Step 500
500
#6F79F5
oklch(63% 0.183 276.3)
-
Step 600
600
#5A5EE4
oklch(55.6% 0.199 276.5)
-
Step 700
700
#4B4DC6
oklch(49.2% 0.184 276.5)
-
Step 800
800
#3D40A0
oklch(42.8% 0.152 276.5)
-
Step 900
900 (this color)
#373C84
oklch(39.3% 0.119 276.5)
-
Step 950
950
#1E214A
oklch(27% 0.075 277)
#373C84 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) | #124787 | 0.043 |
| Deuteranopia (no green cones) | #014082 | 0.048 |
| Tritanopia (no blue cones) | #0B4C5A | 0.103 |
| Achromatopsia (no color) | #444444 | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #373C84
#373C84
oklch(39.3% 0.119 276.5)
- #534500
#534500
oklch(39.3% 0.081 95.8)
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 #373C84, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.030
- Blueberry #464196 ΔE 0.040
- Cobalt #1E488F ΔE 0.041
- Twilight Blue #0A437A ΔE 0.049
- Light Navy #155084 ΔE 0.061
- Dusk Blue #26538D ΔE 0.064
- Sapphire #2138AB ΔE 0.070
- Twilight #4E518B ΔE 0.072
Use #373C84 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.