#373D83
Closest named color: Dark Slate Blue (#483D8B). oklch(39.4% 0.116 276), rgb(55, 61, 131).
Aa
White text reads best on this color (9.73:1).
About this color
#373D83 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.116 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 9.73:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.15:1 |
| White text | 9.73:1 |
Values
| HEX | #373D83 |
| RGB | rgb(55, 61, 131) |
| HSL | hsl(235, 41%, 36%) |
| OKLCH | oklch(39.4% 0.116 276) |
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 #373D83 | 9.73:1 | AAA | Lc -96.5 | Preferred for body text |
| Black text on #373D83 | 2.15:1 | Fails | Lc 11.6 | Not readable |
| #373D83 text on white | 9.73:1 | AAA | Lc 92.3 | Preferred for body text |
| #373D83 text on black | 2.15:1 | Fails | Lc -10.1 | 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
#E5E9FB
oklch(93.6% 0.025 275.9)
-
Step 200
200
#D0D7FA
oklch(88.5% 0.049 276.4)
-
Step 300
300
#B1BCF9
oklch(80.8% 0.087 276.4)
-
Step 400
400
#8A97F6
oklch(70.6% 0.139 276.3)
-
Step 500
500
#6F7AF3
oklch(63.1% 0.179 276.1)
-
Step 600
600
#5960E1
oklch(55.6% 0.193 275.8)
-
Step 700
700
#4A4EC4
oklch(49.1% 0.18 276)
-
Step 800
800
#3C419E
oklch(42.7% 0.148 275.8)
-
Step 900
900 (this color)
#373D83
oklch(39.4% 0.116 276)
-
Step 950
950
#1D214A
oklch(26.9% 0.075 275.9)
#373D83 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) | #174785 | 0.040 |
| Deuteranopia (no green cones) | #084182 | 0.044 |
| Tritanopia (no blue cones) | #0C4D5A | 0.102 |
| Achromatopsia (no color) | #444444 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #373D83
#373D83
oklch(39.4% 0.116 276)
- #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 #373D83, 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
- Cobalt #1E488F ΔE 0.040
- Blueberry #464196 ΔE 0.041
- Twilight Blue #0A437A ΔE 0.048
- Light Navy #155084 ΔE 0.059
- Dusk Blue #26538D ΔE 0.062
- Twilight #4E518B ΔE 0.069
- Marine Blue #01386A ΔE 0.072
Use #373D83 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.