#393F8B
Closest named color: Dark Slate Blue (#483D8B). oklch(40.6% 0.125 276), rgb(57, 63, 139).
Aa
White text reads best on this color (9.30:1).
About this color
#393F8B is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.125 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.023 away. White text reads best on it, at 9.30:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.25:1 |
| White text | 9.30:1 |
Values
| HEX | #393F8B |
| RGB | rgb(57, 63, 139) |
| HSL | hsl(236, 42%, 38%) |
| OKLCH | oklch(40.6% 0.125 276) |
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 #393F8B | 9.30:1 | AAA | Lc -95.5 | Preferred for body text |
| Black text on #393F8B | 2.25:1 | Fails | Lc 12.8 | Not readable |
| #393F8B text on white | 9.30:1 | AAA | Lc 91.2 | Preferred for body text |
| #393F8B text on black | 2.25:1 | Fails | Lc -11.1 | 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 800.
-
Step 50
50
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E6E9F8
oklch(93.6% 0.02 276.9)
-
Step 200
200
#D1D8F5
oklch(88.6% 0.041 274.8)
-
Step 300
300
#B3BDF0
oklch(80.8% 0.073 276)
-
Step 400
400
#8D9AE9
oklch(70.8% 0.116 275.9)
-
Step 500
500
#727FE2
oklch(63.2% 0.148 275.7)
-
Step 600
600
#5C66D0
oklch(55.7% 0.161 275.8)
-
Step 700
700
#4C54B4
oklch(49.2% 0.15 275.8)
-
Step 800
800 (this color)
#393F8B
oklch(40.6% 0.125 276)
-
Step 900
900
#343B74
oklch(37.7% 0.097 275.5)
-
Step 950
950
#1F2344
oklch(27.1% 0.061 276.3)
#393F8B 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) | #114A8E | 0.044 |
| Deuteranopia (no green cones) | #004489 | 0.048 |
| Tritanopia (no blue cones) | #05505E | 0.109 |
| Achromatopsia (no color) | #474747 | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #393F8B
#393F8B
oklch(40.6% 0.125 276)
- #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 #393F8B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.023
- Blueberry #464196 ΔE 0.028
- Cobalt #1E488F ΔE 0.035
- Twilight Blue #0A437A ΔE 0.055
- Dusk Blue #26538D ΔE 0.056
- Light Navy #155084 ΔE 0.058
- Twilight #4E518B ΔE 0.062
- Sapphire #2138AB ΔE 0.064
Use #393F8B 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.