#3C3E81
Closest named color: Dark Slate Blue (#483D8B). oklch(39.9% 0.11 278.9), rgb(60, 62, 129).
Aa
White text reads best on this color (9.55:1).
About this color
#3C3E81 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.110 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.026 away. White text reads best on it, at 9.55:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.19:1 |
| White text | 9.55:1 |
Values
| HEX | #3C3E81 |
| RGB | rgb(60, 62, 129) |
| HSL | hsl(238, 37%, 37%) |
| OKLCH | oklch(39.9% 0.11 278.9) |
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 #3C3E81 | 9.55:1 | AAA | Lc -96.2 | Preferred for body text |
| Black text on #3C3E81 | 2.19:1 | Fails | Lc 12.0 | Not readable |
| #3C3E81 text on white | 9.55:1 | AAA | Lc 91.9 | Preferred for body text |
| #3C3E81 text on black | 2.19:1 | Fails | Lc -10.5 | 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
#F4F5FD
oklch(97.2% 0.011 280.5)
-
Step 100
100
#E6E9FA
oklch(93.7% 0.023 277.9)
-
Step 200
200
#D2D7F8
oklch(88.6% 0.046 278.6)
-
Step 300
300
#B4BCF6
oklch(80.9% 0.082 278.3)
-
Step 400
400
#8F97F2
oklch(70.8% 0.133 278.6)
-
Step 500
500
#767AED
oklch(63.2% 0.169 278.9)
-
Step 600
600
#6060DB
oklch(55.6% 0.183 278.6)
-
Step 700
700
#504EBE
oklch(49.1% 0.171 278.8)
-
Step 800
800
#41419A
oklch(42.8% 0.142 278.6)
-
Step 900
900 (this color)
#3C3E81
oklch(39.9% 0.11 278.9)
-
Step 950
950
#202148
oklch(27% 0.071 279.4)
#3C3E81 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) | #1D4883 | 0.042 |
| Deuteranopia (no green cones) | #164380 | 0.043 |
| Tritanopia (no blue cones) | #1F4D59 | 0.097 |
| Achromatopsia (no color) | #454545 | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3C3E81
#3C3E81
oklch(39.9% 0.11 278.9)
- #534700
#534700
oklch(39.8% 0.082 98.2)
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 #3C3E81, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.026
- Blueberry #464196 ΔE 0.039
- Cobalt #1E488F ΔE 0.044
- Twilight Blue #0A437A ΔE 0.053
- Light Navy #155084 ΔE 0.059
- Dusk Blue #26538D ΔE 0.061
- Twilight #4E518B ΔE 0.063
- Dusk #4E5481 ΔE 0.072
Use #3C3E81 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.