#373786
Closest named color: Dark Slate Blue (#483D8B). oklch(38.5% 0.129 278.5), rgb(55, 55, 134).
Aa
White text reads best on this color (10.22:1).
About this color
#373786 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.129 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.034 away. White text reads best on it, at 10.22:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.05:1 |
| White text | 10.22:1 |
Values
| HEX | #373786 |
| RGB | rgb(55, 55, 134) |
| HSL | hsl(240, 42%, 37%) |
| OKLCH | oklch(38.5% 0.129 278.5) |
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 #373786 | 10.22:1 | AAA | Lc -97.5 | Preferred for body text |
| Black text on #373786 | 2.05:1 | Fails | Lc 10.5 | Not readable |
| #373786 text on white | 10.22:1 | AAA | Lc 93.4 | Preferred for body text |
| #373786 text on black | 2.05:1 | Fails | Lc -9.1 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E5E8FD
oklch(93.5% 0.029 279.4)
-
Step 200
200
#D0D6FD
oklch(88.4% 0.054 278.3)
-
Step 300
300
#B2BBFF
oklch(81% 0.097 278.2)
-
Step 400
400
#8C94FF
oklch(70.7% 0.155 278.4)
-
Step 500
500
#7375FD
oklch(63.1% 0.198 278.5)
-
Step 600
600
#5E59EC
oklch(55.6% 0.214 278.3)
-
Step 700
700
#4E47CD
oklch(49% 0.2 278.4)
-
Step 800
800
#403CA6
oklch(42.8% 0.165 278.5)
-
Step 900
900 (this color)
#373786
oklch(38.5% 0.129 278.5)
-
Step 950
950
#1F204D
oklch(27.1% 0.081 278.5)
#373786 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) | #004489 | 0.053 |
| Deuteranopia (no green cones) | #003E84 | 0.050 |
| Tritanopia (no blue cones) | #084A59 | 0.112 |
| Achromatopsia (no color) | #414141 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #373786
#373786
oklch(38.5% 0.129 278.5)
- #4F4400
#4F4400
oklch(38.6% 0.08 98.7)
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 #373786, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.034
- Blueberry #464196 ΔE 0.045
- Cobalt #1E488F ΔE 0.050
- Twilight Blue #0A437A ΔE 0.057
- Sapphire #2138AB ΔE 0.066
- Light Navy #155084 ΔE 0.073
- Marine Blue #01386A ΔE 0.074
- Dusk Blue #26538D ΔE 0.076
Use #373786 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.