#3C3188
Closest named color: Dark Slate Blue (#483D8B). oklch(37.9% 0.139 283.3), rgb(60, 49, 136).
Aa
White text reads best on this color (10.56:1).
About this color
#3C3188 is a dark, moderately saturated purple. In OKLCH its lightness is 38%, its chroma 0.139 and its hue 283°. 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 10.56:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.98:1 |
| White text | 10.56:1 |
Values
| HEX | #3C3188 |
| RGB | rgb(60, 49, 136) |
| HSL | hsl(248, 47%, 36%) |
| OKLCH | oklch(37.9% 0.139 283.3) |
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 #3C3188 | 10.56:1 | AAA | Lc -98.1 | Preferred for body text |
| Black text on #3C3188 | 1.98:1 | Fails | Lc 9.8 | Not readable |
| #3C3188 text on white | 10.56:1 | AAA | Lc 94.1 | Preferred for body text |
| #3C3188 text on black | 1.98:1 | Fails | Lc -8.5 | 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
#F4F4FF
oklch(97% 0.015 286.1)
-
Step 100
100
#E7E8FE
oklch(93.7% 0.03 283.7)
-
Step 200
200
#D3D5FF
oklch(88.5% 0.058 283)
-
Step 300
300
#B7B9FF
oklch(80.9% 0.098 282.7)
-
Step 400
400
#9591FF
oklch(70.8% 0.158 283.2)
-
Step 500
500
#7E70FF
oklch(63.2% 0.205 283.3)
-
Step 600
600
#6A4FF3
oklch(55.6% 0.232 283.3)
-
Step 700
700
#593ED4
oklch(49.1% 0.216 283.2)
-
Step 800
800
#4835AB
oklch(42.7% 0.179 283.1)
-
Step 900
900 (this color)
#3C3188
oklch(37.9% 0.139 283.3)
-
Step 950
950
#221D4F
oklch(26.9% 0.089 283.2)
#3C3188 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) | #00428B | 0.065 |
| Deuteranopia (no green cones) | #003C86 | 0.061 |
| Tritanopia (no blue cones) | #1A4657 | 0.118 |
| Achromatopsia (no color) | #3F3F3F | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3C3188
#3C3188
oklch(37.9% 0.139 283.3)
- #4A4400
#4A4400
oklch(38.1% 0.08 103.8)
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 #3C3188, 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
- Blueberry #464196 ΔE 0.049
- Cobalt #1E488F ΔE 0.065
- Sapphire #2138AB ΔE 0.068
- Twilight Blue #0A437A ΔE 0.072
- Imperial Purple #480CA8 ΔE 0.072
- Indigo #4B0082 ΔE 0.076
- Indigo Blue #3A18B1 ΔE 0.076
Use #3C3188 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.