#3D3781
Closest named color: Dark Slate Blue (#483D8B). oklch(38.6% 0.121 282.8), rgb(61, 55, 129).
Aa
White text reads best on this color (10.18:1).
About this color
#3D3781 is a dark, moderately saturated purple. In OKLCH its lightness is 39%, its chroma 0.121 and its hue 283°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.030 away. White text reads best on it, at 10.18:1.
| Hue family | Purples |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.06:1 |
| White text | 10.18:1 |
Values
| HEX | #3D3781 |
| RGB | rgb(61, 55, 129) |
| HSL | hsl(245, 40%, 36%) |
| OKLCH | oklch(38.6% 0.121 282.8) |
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 #3D3781 | 10.18:1 | AAA | Lc -97.5 | Preferred for body text |
| Black text on #3D3781 | 2.06:1 | Fails | Lc 10.6 | Not readable |
| #3D3781 text on white | 10.18:1 | AAA | Lc 93.4 | Preferred for body text |
| #3D3781 text on black | 2.06:1 | Fails | Lc -9.1 | 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
#F4F5FE
oklch(97.2% 0.012 281.1)
-
Step 100
100
#E7E8FB
oklch(93.6% 0.026 283.5)
-
Step 200
200
#D4D6FA
oklch(88.6% 0.049 282.8)
-
Step 300
300
#B8BAFA
oklch(81% 0.09 282.8)
-
Step 400
400
#9593F7
oklch(70.7% 0.144 283)
-
Step 500
500
#7D74F4
oklch(63.1% 0.186 282.9)
-
Step 600
600
#6859E2
oklch(55.6% 0.2 282.7)
-
Step 700
700
#5748C5
oklch(49.2% 0.187 282.5)
-
Step 800
800
#473C9F
oklch(42.7% 0.154 282.7)
-
Step 900
900 (this color)
#3D3781
oklch(38.6% 0.121 282.8)
-
Step 950
950
#221F4A
oklch(26.9% 0.077 283)
#3D3781 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) | #084484 | 0.058 |
| Deuteranopia (no green cones) | #003F7F | 0.060 |
| Tritanopia (no blue cones) | #234856 | 0.103 |
| Achromatopsia (no color) | #414141 | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3D3781
#3D3781
oklch(38.6% 0.121 282.8)
- #4C4500
#4C4500
oklch(38.5% 0.081 102.9)
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 #3D3781, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.030
- Blueberry #464196 ΔE 0.045
- Cobalt #1E488F ΔE 0.056
- Twilight Blue #0A437A ΔE 0.061
- Light Navy #155084 ΔE 0.075
- Marine Blue #01386A ΔE 0.077
- Sapphire #2138AB ΔE 0.078
- Dusk Blue #26538D ΔE 0.078
Use #3D3781 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.