#3B3171
Closest named color: Dark Slate Blue (#483D8B). oklch(36% 0.106 287), rgb(59, 49, 113).
Aa
White text reads best on this color (11.26:1).
About this color
#3B3171 is a dark, moderately saturated purple. In OKLCH its lightness is 36%, its chroma 0.106 and its hue 287°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.057 away. White text reads best on it, at 11.26:1.
| Hue family | Purples |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.86:1 |
| White text | 11.26:1 |
Values
| HEX | #3B3171 |
| RGB | rgb(59, 49, 113) |
| HSL | hsl(249, 40%, 32%) |
| OKLCH | oklch(36% 0.106 287) |
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 #3B3171 | 11.26:1 | AAA | Lc -99.6 | Preferred for body text |
| Black text on #3B3171 | 1.86:1 | Fails | Lc 8.1 | Not readable |
| #3B3171 text on white | 11.26:1 | AAA | Lc 95.8 | Preferred for body text |
| #3B3171 text on black | 1.86:1 | Fails | Lc 0.0 | 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
#F5F4FC
oklch(97% 0.011 292)
-
Step 100
100
#E8E8F9
oklch(93.6% 0.023 286)
-
Step 200
200
#D6D5F6
oklch(88.4% 0.045 286.8)
-
Step 300
300
#BCB9F2
oklch(80.8% 0.08 286.9)
-
Step 400
400
#9C93EC
oklch(70.7% 0.128 287.3)
-
Step 500
500
#8576E6
oklch(63.2% 0.163 286.9)
-
Step 600
600
#705CD4
oklch(55.7% 0.177 286.8)
-
Step 700
700
#5E4AB7
oklch(49% 0.165 287.1)
-
Step 800
800
#4D3E94
oklch(42.7% 0.136 287.2)
-
Step 900
900 (this color)
#3B3171
oklch(36% 0.106 287)
-
Step 950
950
#252045
oklch(27% 0.067 287.2)
#3B3171 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) | #103C73 | 0.056 |
| Deuteranopia (no green cones) | #0F3970 | 0.056 |
| Tritanopia (no blue cones) | #2A3F4C | 0.089 |
| Achromatopsia (no color) | #3B3B3B | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3B3171
#3B3171
oklch(36% 0.106 287)
- #423F00
#423F00
oklch(35.9% 0.077 106.7)
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 #3B3171, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.057
- Marine Blue #01386A ΔE 0.065
- Prussian Blue #1D3557 ΔE 0.066
- Twilight Blue #0A437A ΔE 0.067
- Blueberry #464196 ΔE 0.075
- Marine #042E60 ΔE 0.076
- Cobalt #1E488F ΔE 0.079
- Dark Grey Blue #29465B ΔE 0.082
Use #3B3171 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.