#383C7B
Closest named color: Dark Slate Blue (#483D8B). oklch(38.7% 0.105 277.6), rgb(56, 60, 123).
Aa
White text reads best on this color (9.99:1).
About this color
#383C7B is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.105 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.038 away. White text reads best on it, at 9.99:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.10:1 |
| White text | 9.99:1 |
Values
| HEX | #383C7B |
| RGB | rgb(56, 60, 123) |
| HSL | hsl(236, 37%, 35%) |
| OKLCH | oklch(38.7% 0.105 277.6) |
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 #383C7B | 9.99:1 | AAA | Lc -97.2 | Preferred for body text |
| Black text on #383C7B | 2.10:1 | Fails | Lc 10.9 | Not readable |
| #383C7B text on white | 9.99:1 | AAA | Lc 93.0 | Preferred for body text |
| #383C7B text on black | 2.10:1 | Fails | Lc -9.5 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E6E9FA
oklch(93.7% 0.023 277.9)
-
Step 200
200
#D2D7F7
oklch(88.5% 0.044 278.4)
-
Step 300
300
#B4BCF4
oklch(80.9% 0.08 278.1)
-
Step 400
400
#8E98EE
oklch(70.7% 0.126 277.6)
-
Step 500
500
#747CE9
oklch(63.2% 0.162 277.5)
-
Step 600
600
#5E62D7
oklch(55.6% 0.176 277.5)
-
Step 700
700
#4E50BA
oklch(49% 0.163 277.7)
-
Step 800
800
#404397
oklch(42.8% 0.135 277.5)
-
Step 900
900 (this color)
#383C7B
oklch(38.7% 0.105 277.6)
-
Step 950
950
#1F2246
oklch(27% 0.066 277.4)
#383C7B 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) | #1E457D | 0.037 |
| Deuteranopia (no green cones) | #16407A | 0.039 |
| Tritanopia (no blue cones) | #1B4A55 | 0.093 |
| Achromatopsia (no color) | #424242 | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #383C7B
#383C7B
oklch(38.7% 0.105 277.6)
- #504400
#504400
oklch(38.7% 0.08 97.7)
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 #383C7B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.038
- Twilight Blue #0A437A ΔE 0.046
- Cobalt #1E488F ΔE 0.049
- Blueberry #464196 ΔE 0.052
- Light Navy #155084 ΔE 0.062
- Marine Blue #01386A ΔE 0.066
- Dusk Blue #26538D ΔE 0.067
- Dark Grey Blue #29465B ΔE 0.071
Use #383C7B 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.