#3B3981
Closest named color: Dark Slate Blue (#483D8B). oklch(38.8% 0.118 280.6), rgb(59, 57, 129).
Aa
White text reads best on this color (10.05:1).
About this color
#3B3981 is a dark, moderately saturated purple. In OKLCH its lightness is 39%, its chroma 0.118 and its hue 281°. 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 10.05:1.
| Hue family | Purples |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.08:1 |
| White text | 10.05:1 |
Values
| HEX | #3B3981 |
| RGB | rgb(59, 57, 129) |
| HSL | hsl(242, 39%, 36%) |
| OKLCH | oklch(38.8% 0.118 280.6) |
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 #3B3981 | 10.05:1 | AAA | Lc -97.2 | Preferred for body text |
| Black text on #3B3981 | 2.08:1 | Fails | Lc 10.8 | Not readable |
| #3B3981 text on white | 10.05:1 | AAA | Lc 93.1 | Preferred for body text |
| #3B3981 text on black | 2.08:1 | Fails | Lc -9.4 | 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
#D2D6FA
oklch(88.4% 0.05 280.3)
-
Step 300
300
#B6BBF9
oklch(81% 0.088 280.7)
-
Step 400
400
#9195F6
oklch(70.8% 0.14 280.4)
-
Step 500
500
#7977F3
oklch(63.2% 0.181 280.6)
-
Step 600
600
#645BE1
oklch(55.5% 0.197 280.9)
-
Step 700
700
#534AC4
oklch(49.1% 0.183 280.5)
-
Step 800
800
#443E9E
oklch(42.8% 0.151 280.7)
-
Step 900
900 (this color)
#3B3981
oklch(38.8% 0.118 280.6)
-
Step 950
950
#21204A
oklch(27% 0.076 281.1)
#3B3981 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) | #0F4583 | 0.052 |
| Deuteranopia (no green cones) | #043F7F | 0.054 |
| Tritanopia (no blue cones) | #1D4957 | 0.101 |
| Achromatopsia (no color) | #424242 | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3B3981
#3B3981
oklch(38.8% 0.118 280.6)
- #4E4500
#4E4500
oklch(38.8% 0.081 100.9)
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 #3B3981, 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 0.044
- Cobalt #1E488F ΔE 0.051
- Twilight Blue #0A437A ΔE 0.056
- Light Navy #155084 ΔE 0.070
- Dusk Blue #26538D ΔE 0.073
- Marine Blue #01386A ΔE 0.074
- Twilight #4E518B ΔE 0.076
Use #3B3981 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.