#373981
Closest named color: Dark Slate Blue (#483D8B). oklch(38.5% 0.119 278), rgb(55, 57, 129).
Aa
White text reads best on this color (10.17:1).
About this color
#373981 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.119 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.035 away. White text reads best on it, at 10.17:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.06:1 |
| White text | 10.17:1 |
Values
| HEX | #373981 |
| RGB | rgb(55, 57, 129) |
| HSL | hsl(238, 40%, 36%) |
| OKLCH | oklch(38.5% 0.119 278) |
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 #373981 | 10.17:1 | AAA | Lc -97.5 | Preferred for body text |
| Black text on #373981 | 2.06:1 | Fails | Lc 10.6 | Not readable |
| #373981 text on white | 10.17:1 | AAA | Lc 93.3 | Preferred for body text |
| #373981 text on black | 2.06:1 | 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
#E5E9FC
oklch(93.7% 0.026 276.4)
-
Step 200
200
#D1D7FA
oklch(88.6% 0.049 277.7)
-
Step 300
300
#B3BBFA
oklch(80.8% 0.089 278.6)
-
Step 400
400
#8D96F8
oklch(70.8% 0.143 278.1)
-
Step 500
500
#7378F4
oklch(63.1% 0.182 278.1)
-
Step 600
600
#5E5DE3
oklch(55.6% 0.198 278.1)
-
Step 700
700
#4E4CC5
oklch(49.2% 0.183 278)
-
Step 800
800
#403F9F
oklch(42.7% 0.152 278.3)
-
Step 900
900 (this color)
#373981
oklch(38.5% 0.119 278)
-
Step 950
950
#1F214A
oklch(27.1% 0.075 278.1)
#373981 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) | #0D4483 | 0.047 |
| Deuteranopia (no green cones) | #003E7F | 0.050 |
| Tritanopia (no blue cones) | #114957 | 0.103 |
| Achromatopsia (no color) | #414141 | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #373981
#373981
oklch(38.5% 0.119 278)
- #4F4300
#4F4300
oklch(38.4% 0.079 97.6)
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 #373981, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.035
- Blueberry #464196 ΔE 0.047
- Cobalt #1E488F ΔE 0.049
- Twilight Blue #0A437A ΔE 0.051
- Light Navy #155084 ΔE 0.068
- Marine Blue #01386A ΔE 0.069
- Dusk Blue #26538D ΔE 0.072
- Sapphire #2138AB ΔE 0.074
Use #373981 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.