#3C378D
Closest named color: Dark Slate Blue (#483D8B). oklch(39.4% 0.138 280.6), rgb(60, 55, 141).
Aa
White text reads best on this color (9.89:1).
About this color
#3C378D is a dark, moderately saturated purple. In OKLCH its lightness is 39%, its chroma 0.138 and its hue 281°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.027 away. White text reads best on it, at 9.89:1.
| Hue family | Purples |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.12:1 |
| White text | 9.89:1 |
Values
| HEX | #3C378D |
| RGB | rgb(60, 55, 141) |
| HSL | hsl(243, 44%, 38%) |
| OKLCH | oklch(39.4% 0.138 280.6) |
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 #3C378D | 9.89:1 | AAA | Lc -96.8 | Preferred for body text |
| Black text on #3C378D | 2.12:1 | Fails | Lc 11.4 | Not readable |
| #3C378D text on white | 9.89:1 | AAA | Lc 92.6 | Preferred for body text |
| #3C378D text on black | 2.12:1 | Fails | Lc -9.9 | 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
#F3F5FF
oklch(97.2% 0.013 277.1)
-
Step 100
100
#E6E8FE
oklch(93.6% 0.03 281.7)
-
Step 200
200
#D1D6FF
oklch(88.5% 0.057 279.7)
-
Step 300
300
#B4BAFF
oklch(80.9% 0.098 280.1)
-
Step 400
400
#9093FF
oklch(70.8% 0.156 280.4)
-
Step 500
500
#7872FF
oklch(63.1% 0.203 280.8)
-
Step 600
600
#6352F3
oklch(55.5% 0.23 280.6)
-
Step 700
700
#5341D4
oklch(49.1% 0.214 280.6)
-
Step 800
800
#4437AB
oklch(42.7% 0.177 280.9)
-
Step 900
900 (this color)
#3C378D
oklch(39.4% 0.138 280.6)
-
Step 950
950
#201E4F
oklch(26.9% 0.087 280.6)
#3C378D 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) | #004690 | 0.060 |
| Deuteranopia (no green cones) | #00408B | 0.057 |
| Tritanopia (no blue cones) | #124C5C | 0.120 |
| Achromatopsia (no color) | #434343 | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3C378D
#3C378D
oklch(39.4% 0.138 280.6)
- #504700
#504700
oklch(39.5% 0.082 101.1)
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 #3C378D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.027
- Blueberry #464196 ΔE 0.034
- Cobalt #1E488F ΔE 0.052
- Sapphire #2138AB ΔE 0.060
- Twilight Blue #0A437A ΔE 0.067
- Dusk Blue #26538D ΔE 0.076
- Imperial Purple #480CA8 ΔE 0.076
- Indigo Blue #3A18B1 ΔE 0.077
Use #3C378D 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.