#3B3780
Closest named color: Dark Slate Blue (#483D8B). oklch(38.3% 0.119 281.6), rgb(59, 55, 128).
Aa
White text reads best on this color (10.27:1).
About this color
#3B3780 is a dark, moderately saturated purple. In OKLCH its lightness is 38%, its chroma 0.119 and its hue 282°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.033 away. White text reads best on it, at 10.27:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.04:1 |
| White text | 10.27:1 |
Values
| HEX | #3B3780 |
| RGB | rgb(59, 55, 128) |
| HSL | hsl(243, 40%, 36%) |
| OKLCH | oklch(38.3% 0.119 281.6) |
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 #3B3780 | 10.27:1 | AAA | Lc -97.7 | Preferred for body text |
| Black text on #3B3780 | 2.04:1 | Fails | Lc 10.3 | Not readable |
| #3B3780 text on white | 10.27:1 | AAA | Lc 93.6 | Preferred for body text |
| #3B3780 text on black | 2.04:1 | Fails | Lc -8.9 | 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
#F4F5FE
oklch(97.2% 0.012 281.1)
-
Step 100
100
#E6E8FB
oklch(93.5% 0.026 281.1)
-
Step 200
200
#D3D6FA
oklch(88.5% 0.05 281.6)
-
Step 300
300
#B6BAFA
oklch(80.9% 0.09 281.4)
-
Step 400
400
#9394F7
oklch(70.8% 0.143 281.7)
-
Step 500
500
#7B75F3
oklch(63% 0.183 281.9)
-
Step 600
600
#665AE2
oklch(55.6% 0.199 281.7)
-
Step 700
700
#5549C4
oklch(49.1% 0.184 281.6)
-
Step 800
800
#453D9F
oklch(42.7% 0.153 281.4)
-
Step 900
900 (this color)
#3B3780
oklch(38.3% 0.119 281.6)
-
Step 950
950
#21204A
oklch(27% 0.076 281.1)
#3B3780 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) | #094382 | 0.055 |
| Deuteranopia (no green cones) | #003E7E | 0.057 |
| Tritanopia (no blue cones) | #1F4856 | 0.102 |
| Achromatopsia (no color) | #414141 | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3B3780
#3B3780
oklch(38.3% 0.119 281.6)
- #4C4400
#4C4400
oklch(38.3% 0.08 101.8)
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 #3B3780, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.033
- Blueberry #464196 ΔE 0.048
- Cobalt #1E488F ΔE 0.056
- Twilight Blue #0A437A ΔE 0.058
- Marine Blue #01386A ΔE 0.073
- Light Navy #155084 ΔE 0.074
- Sapphire #2138AB ΔE 0.078
- Dusk Blue #26538D ΔE 0.078
Use #3B3780 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.