#3D3178
Closest named color: Dark Slate Blue (#483D8B). oklch(36.7% 0.116 287), rgb(61, 49, 120).
Aa
White text reads best on this color (11.00:1).
About this color
#3D3178 is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.116 and its hue 287°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.048 away. White text reads best on it, at 11.00:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.90:1 |
| White text | 11.00:1 |
Values
| HEX | #3D3178 |
| RGB | rgb(61, 49, 120) |
| HSL | hsl(250, 42%, 33%) |
| OKLCH | oklch(36.7% 0.116 287) |
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 #3D3178 | 11.00:1 | AAA | Lc -99.0 | Preferred for body text |
| Black text on #3D3178 | 1.90:1 | Fails | Lc 8.7 | Not readable |
| #3D3178 text on white | 11.00:1 | AAA | Lc 95.2 | Preferred for body text |
| #3D3178 text on black | 1.90:1 | Fails | Lc -7.5 | 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
#F5F4FD
oklch(97% 0.012 291.3)
-
Step 100
100
#E8E8FA
oklch(93.6% 0.024 285.9)
-
Step 200
200
#D6D5F8
oklch(88.5% 0.048 286.7)
-
Step 300
300
#BCB9F7
oklch(81% 0.087 286.5)
-
Step 400
400
#9B91F3
oklch(70.6% 0.141 286.9)
-
Step 500
500
#8573EE
oklch(63.1% 0.178 286.8)
-
Step 600
600
#7157DC
oklch(55.5% 0.194 287.3)
-
Step 700
700
#5F46BF
oklch(49% 0.181 287.3)
-
Step 800
800
#4D3B9B
oklch(42.8% 0.15 286.9)
-
Step 900
900 (this color)
#3D3178
oklch(36.7% 0.116 287)
-
Step 950
950
#251F48
oklch(27% 0.074 287.1)
#3D3178 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) | #033E7A | 0.065 |
| Deuteranopia (no green cones) | #023A76 | 0.065 |
| Tritanopia (no blue cones) | #29414F | 0.098 |
| Achromatopsia (no color) | #3C3C3C | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3D3178
#3D3178
oklch(36.7% 0.116 287)
- #444100
#444100
oklch(36.6% 0.078 106.7)
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 #3D3178, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.048
- Blueberry #464196 ΔE 0.065
- Twilight Blue #0A437A ΔE 0.068
- Marine Blue #01386A ΔE 0.072
- Cobalt #1E488F ΔE 0.074
- Prussian Blue #1D3557 ΔE 0.077
- Indigo #4B0082 ΔE 0.078
- Marine #042E60 ΔE 0.085
Use #3D3178 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.