#3F376D
Closest named color: Dark Slate Blue (#483D8B). oklch(37.3% 0.09 288), rgb(63, 55, 109).
Aa
White text reads best on this color (10.61:1).
About this color
#3F376D is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.090 and its hue 288°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.054 away. White text reads best on it, at 10.61:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.97:1 |
| White text | 10.61:1 |
Values
| HEX | #3F376D |
| RGB | rgb(63, 55, 109) |
| HSL | hsl(249, 33%, 32%) |
| OKLCH | oklch(37.3% 0.09 288) |
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 #3F376D | 10.61:1 | AAA | Lc -98.4 | Preferred for body text |
| Black text on #3F376D | 1.97:1 | Fails | Lc 9.4 | Not readable |
| #3F376D text on white | 10.61:1 | AAA | Lc 94.5 | Preferred for body text |
| #3F376D text on black | 1.97:1 | Fails | Lc -8.1 | 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
#F5F5FB
oklch(97.2% 0.008 286.3)
-
Step 100
100
#E9E8F7
oklch(93.6% 0.02 289.1)
-
Step 200
200
#D7D6F1
oklch(88.5% 0.037 287.3)
-
Step 300
300
#BEBAEB
oklch(80.9% 0.069 288.5)
-
Step 400
400
#9D95E0
oklch(70.6% 0.108 288.2)
-
Step 500
500
#867AD8
oklch(63.2% 0.138 287.6)
-
Step 600
600
#7161C5
oklch(55.6% 0.15 287.9)
-
Step 700
700
#5F4FAA
oklch(49% 0.14 288.2)
-
Step 800
800
#4D428A
oklch(42.8% 0.115 287.5)
-
Step 900
900 (this color)
#3F376D
oklch(37.3% 0.09 288)
-
Step 950
950
#252141
oklch(27% 0.058 287.5)
#3F376D 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) | #23406F | 0.044 |
| Deuteranopia (no green cones) | #223D6C | 0.043 |
| Tritanopia (no blue cones) | #32424C | 0.077 |
| Achromatopsia (no color) | #3E3E3E | 0.091 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F376D
#3F376D
oklch(37.3% 0.09 288)
- #454300
#454300
oklch(37.3% 0.08 107.8)
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 #3F376D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.054
- Twilight Blue #0A437A ΔE 0.063
- Prussian Blue #1D3557 ΔE 0.065
- Dark Grey Blue #29465B ΔE 0.067
- Marine Blue #01386A ΔE 0.069
- Blueberry #464196 ΔE 0.072
- Cobalt #1E488F ΔE 0.075
- Dark Blue Grey #1F3B4D ΔE 0.078
Use #3F376D 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.