#3F3769
Closest named color: Dark Slate Blue (#483D8B). oklch(37% 0.084 289), rgb(63, 55, 105).
Aa
White text reads best on this color (10.70:1).
About this color
#3F3769 is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.084 and its hue 289°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.060 away. White text reads best on it, at 10.70:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.084) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.96:1 |
| White text | 10.70:1 |
Values
| HEX | #3F3769 |
| RGB | rgb(63, 55, 105) |
| HSL | hsl(250, 31%, 31%) |
| OKLCH | oklch(37% 0.084 289) |
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 #3F3769 | 10.70:1 | AAA | Lc -98.6 | Preferred for body text |
| Black text on #3F3769 | 1.96:1 | Fails | Lc 9.2 | Not readable |
| #3F3769 text on white | 10.70:1 | AAA | Lc 94.7 | Preferred for body text |
| #3F3769 text on black | 1.96:1 | Fails | Lc -7.9 | 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
#F5F5FB
oklch(97.2% 0.008 286.3)
-
Step 100
100
#E9E8F6
oklch(93.6% 0.019 289.3)
-
Step 200
200
#D8D6EF
oklch(88.5% 0.034 289.4)
-
Step 300
300
#BFBBE8
oklch(81% 0.063 289)
-
Step 400
400
#9E96DC
oklch(70.7% 0.101 288.8)
-
Step 500
500
#887BD2
oklch(63.2% 0.128 289)
-
Step 600
600
#7262BF
oklch(55.5% 0.14 288.9)
-
Step 700
700
#6051A5
oklch(49.1% 0.13 288.9)
-
Step 800
800
#4E4386
oklch(42.8% 0.108 288.5)
-
Step 900
900 (this color)
#3F3769
oklch(37% 0.084 289)
-
Step 950
950
#26223F
oklch(27.2% 0.053 288.7)
#3F3769 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) | #253F6B | 0.041 |
| Deuteranopia (no green cones) | #253D68 | 0.040 |
| Tritanopia (no blue cones) | #34414B | 0.070 |
| Achromatopsia (no color) | #3E3E3E | 0.084 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F3769
#3F3769
oklch(37% 0.084 289)
- #444300
#444300
oklch(37.2% 0.081 108.8)
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 #3F3769, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.060
- Prussian Blue #1D3557 ΔE 0.062
- Dark Grey Blue #29465B ΔE 0.063
- Twilight Blue #0A437A ΔE 0.065
- Marine Blue #01386A ΔE 0.068
- Dark Blue Grey #1F3B4D ΔE 0.072
- Charcoal #264653 ΔE 0.075
- Blueberry #464196 ΔE 0.078
Use #3F3769 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.