#383F8C
Closest named color: Dark Slate Blue (#483D8B). oklch(40.6% 0.126 275.3), rgb(56, 63, 140).
Aa
White text reads best on this color (9.30:1).
About this color
#383F8C is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.126 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.025 away. White text reads best on it, at 9.30:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.126) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.25:1 |
| White text | 9.30:1 |
Values
| HEX | #383F8C |
| RGB | rgb(56, 63, 140) |
| HSL | hsl(235, 43%, 38%) |
| OKLCH | oklch(40.6% 0.126 275.3) |
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 #383F8C | 9.30:1 | AAA | Lc -95.5 | Preferred for body text |
| Black text on #383F8C | 2.25:1 | Fails | Lc 12.8 | Not readable |
| #383F8C text on white | 9.30:1 | AAA | Lc 91.2 | Preferred for body text |
| #383F8C text on black | 2.25:1 | Fails | Lc -11.2 | 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 800.
-
Step 50
50
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E5E9F9
oklch(93.6% 0.022 274.7)
-
Step 200
200
#D1D8F5
oklch(88.6% 0.041 274.8)
-
Step 300
300
#B3BDF1
oklch(80.9% 0.074 276.1)
-
Step 400
400
#8C9AEA
oklch(70.8% 0.118 275.4)
-
Step 500
500
#717FE3
oklch(63.2% 0.15 275.3)
-
Step 600
600
#5B66D1
oklch(55.7% 0.163 275.4)
-
Step 700
700
#4B54B5
oklch(49.2% 0.152 275.3)
-
Step 800
800 (this color)
#383F8C
oklch(40.6% 0.126 275.3)
-
Step 900
900
#343B75
oklch(37.8% 0.098 275.5)
-
Step 950
950
#1E2344
oklch(27% 0.061 275)
#383F8C 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) | #0F4B8F | 0.045 |
| Deuteranopia (no green cones) | #00438A | 0.047 |
| Tritanopia (no blue cones) | #00515F | 0.111 |
| Achromatopsia (no color) | #474747 | 0.127 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #383F8C
#383F8C
oklch(40.6% 0.126 275.3)
- #574800
#574800
oklch(40.5% 0.083 95.4)
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 #383F8C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.025
- Blueberry #464196 ΔE 0.028
- Cobalt #1E488F ΔE 0.034
- Twilight Blue #0A437A ΔE 0.055
- Dusk Blue #26538D ΔE 0.056
- Light Navy #155084 ΔE 0.058
- Sapphire #2138AB ΔE 0.061
- Twilight #4E518B ΔE 0.063
Use #383F8C 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.