#3F3B82
Closest named color: Dark Slate Blue (#483D8B). oklch(39.6% 0.116 282.3), rgb(63, 59, 130).
Aa
White text reads best on this color (9.72:1).
About this color
#3F3B82 is a dark, moderately saturated purple. In OKLCH its lightness is 40%, its chroma 0.116 and its hue 282°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.022 away. White text reads best on it, at 9.72:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.15:1 |
| White text | 9.72:1 |
Values
| HEX | #3F3B82 |
| RGB | rgb(63, 59, 130) |
| HSL | hsl(243, 38%, 37%) |
| OKLCH | oklch(39.6% 0.116 282.3) |
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 #3F3B82 | 9.72:1 | AAA | Lc -96.5 | Preferred for body text |
| Black text on #3F3B82 | 2.15:1 | Fails | Lc 11.6 | Not readable |
| #3F3B82 text on white | 9.72:1 | AAA | Lc 92.3 | Preferred for body text |
| #3F3B82 text on black | 2.15:1 | Fails | Lc -10.1 | 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
#F4F5FD
oklch(97.2% 0.011 280.5)
-
Step 100
100
#E7E8FB
oklch(93.6% 0.026 283.5)
-
Step 200
200
#D3D6F9
oklch(88.5% 0.048 281.5)
-
Step 300
300
#B7BAF8
oklch(80.8% 0.087 282.1)
-
Step 400
400
#9494F4
oklch(70.7% 0.139 282.3)
-
Step 500
500
#7C76F0
oklch(63.1% 0.178 282.2)
-
Step 600
600
#675BDE
oklch(55.5% 0.193 282.3)
-
Step 700
700
#564AC1
oklch(49.1% 0.179 282.1)
-
Step 800
800
#463D9C
oklch(42.6% 0.149 282.3)
-
Step 900
900 (this color)
#3F3B82
oklch(39.6% 0.116 282.3)
-
Step 950
950
#222049
oklch(27% 0.074 282.5)
#3F3B82 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) | #164784 | 0.053 |
| Deuteranopia (no green cones) | #104280 | 0.053 |
| Tritanopia (no blue cones) | #264B58 | 0.100 |
| Achromatopsia (no color) | #444444 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F3B82
#3F3B82
oklch(39.6% 0.116 282.3)
- #504800
#504800
oklch(39.7% 0.083 102.2)
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 #3F3B82, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.022
- Blueberry #464196 ΔE 0.038
- Cobalt #1E488F ΔE 0.051
- Twilight Blue #0A437A ΔE 0.059
- Twilight #4E518B ΔE 0.068
- Light Navy #155084 ΔE 0.068
- Dusk Blue #26538D ΔE 0.069
- Dusk #4E5481 ΔE 0.078
Use #3F3B82 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.