#3F3669
Closest named color: Dark Slate Blue (#483D8B). oklch(36.8% 0.086 289.6), rgb(63, 54, 105).
Aa
White text reads best on this color (10.80:1).
About this color
#3F3669 is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.086 and its hue 290°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.061 away. White text reads best on it, at 10.80:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.94:1 |
| White text | 10.80:1 |
Values
| HEX | #3F3669 |
| RGB | rgb(63, 54, 105) |
| HSL | hsl(251, 32%, 31%) |
| OKLCH | oklch(36.8% 0.086 289.6) |
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 #3F3669 | 10.80:1 | AAA | Lc -98.8 | Preferred for body text |
| Black text on #3F3669 | 1.94:1 | Fails | Lc 9.0 | Not readable |
| #3F3669 text on white | 10.80:1 | AAA | Lc 94.9 | Preferred for body text |
| #3F3669 text on black | 1.94:1 | Fails | Lc -7.7 | 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
#E9E8F6
oklch(93.6% 0.019 289.3)
-
Step 200
200
#D8D6F0
oklch(88.6% 0.036 289.2)
-
Step 300
300
#BFBAE8
oklch(80.8% 0.065 289.9)
-
Step 400
400
#9F96DD
oklch(70.8% 0.103 289.3)
-
Step 500
500
#897AD3
oklch(63.1% 0.131 289.8)
-
Step 600
600
#7361C0
oklch(55.5% 0.143 289.6)
-
Step 700
700
#6150A6
oklch(49.1% 0.133 289.7)
-
Step 800
800
#4F4286
oklch(42.7% 0.109 289.7)
-
Step 900
900 (this color)
#3F3669
oklch(36.8% 0.086 289.6)
-
Step 950
950
#26213F
oklch(26.9% 0.055 289.9)
#3F3669 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) | #243E6B | 0.043 |
| Deuteranopia (no green cones) | #243C68 | 0.042 |
| Tritanopia (no blue cones) | #34404A | 0.072 |
| Achromatopsia (no color) | #3D3D3D | 0.086 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F3669
#3F3669
oklch(36.8% 0.086 289.6)
- #424200
#424200
oklch(36.7% 0.08 109.8)
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 #3F3669, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.061
- Prussian Blue #1D3557 ΔE 0.061
- Dark Grey Blue #29465B ΔE 0.066
- Twilight Blue #0A437A ΔE 0.066
- Marine Blue #01386A ΔE 0.068
- Dark Blue Grey #1F3B4D ΔE 0.073
- Charcoal #264653 ΔE 0.077
- Blueberry #464196 ΔE 0.079
Use #3F3669 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.