#373E84
Closest named color: Dark Slate Blue (#483D8B). oklch(39.7% 0.116 275.5), rgb(55, 62, 132).
Aa
White text reads best on this color (9.61:1).
About this color
#373E84 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.116 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.029 away. White text reads best on it, at 9.61:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.18:1 |
| White text | 9.61:1 |
Values
| HEX | #373E84 |
| RGB | rgb(55, 62, 132) |
| HSL | hsl(235, 41%, 37%) |
| OKLCH | oklch(39.7% 0.116 275.5) |
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 #373E84 | 9.61:1 | AAA | Lc -96.3 | Preferred for body text |
| Black text on #373E84 | 2.18:1 | Fails | Lc 11.9 | Not readable |
| #373E84 text on white | 9.61:1 | AAA | Lc 92.0 | Preferred for body text |
| #373E84 text on black | 2.18:1 | Fails | Lc -10.4 | 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
#E5E9FB
oklch(93.6% 0.025 275.9)
-
Step 200
200
#D0D7FA
oklch(88.5% 0.049 276.4)
-
Step 300
300
#B0BCF9
oklch(80.8% 0.087 275.7)
-
Step 400
400
#8998F6
oklch(70.8% 0.138 275.4)
-
Step 500
500
#6E7BF3
oklch(63.2% 0.178 275.4)
-
Step 600
600
#5860E1
oklch(55.6% 0.193 275.5)
-
Step 700
700
#494EC4
oklch(49.1% 0.181 275.7)
-
Step 800
800
#3B419E
oklch(42.6% 0.149 275.3)
-
Step 900
900 (this color)
#373E84
oklch(39.7% 0.116 275.5)
-
Step 950
950
#1D224A
oklch(27.1% 0.074 275)
#373E84 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) | #184886 | 0.039 |
| Deuteranopia (no green cones) | #0A4283 | 0.042 |
| Tritanopia (no blue cones) | #0A4E5B | 0.102 |
| Achromatopsia (no color) | #454545 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #373E84
#373E84
oklch(39.7% 0.116 275.5)
- #544600
#544600
oklch(39.7% 0.082 96)
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 #373E84, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.029
- Cobalt #1E488F ΔE 0.038
- Blueberry #464196 ΔE 0.039
- Twilight Blue #0A437A ΔE 0.048
- Light Navy #155084 ΔE 0.056
- Dusk Blue #26538D ΔE 0.059
- Twilight #4E518B ΔE 0.067
- Deep Sea Blue #015482 ΔE 0.070
Use #373E84 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.