#3F336B
Closest named color: Dark Slate Blue (#483D8B). oklch(36.4% 0.094 290.8), rgb(63, 51, 107).
Aa
White text reads best on this color (11.06:1).
About this color
#3F336B is a dark, moderately saturated purple. In OKLCH its lightness is 36%, its chroma 0.094 and its hue 291°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.060 away. White text reads best on it, at 11.06:1.
| Hue family | Purples |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.094) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.89:1 |
| White text | 11.06:1 |
Values
| HEX | #3F336B |
| RGB | rgb(63, 51, 107) |
| HSL | hsl(253, 35%, 31%) |
| OKLCH | oklch(36.4% 0.094 290.8) |
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 #3F336B | 11.06:1 | AAA | Lc -99.3 | Preferred for body text |
| Black text on #3F336B | 1.89:1 | Fails | Lc 8.5 | Not readable |
| #3F336B text on white | 11.06:1 | AAA | Lc 95.4 | Preferred for body text |
| #3F336B text on black | 1.89:1 | 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
#F5F4FB
oklch(97% 0.009 292.8)
-
Step 100
100
#E9E8F7
oklch(93.6% 0.02 289.1)
-
Step 200
200
#D8D5F2
oklch(88.4% 0.04 290.3)
-
Step 300
300
#C0B9EB
oklch(80.8% 0.07 291.2)
-
Step 400
400
#A194E2
oklch(70.8% 0.113 290.9)
-
Step 500
500
#8B77D9
oklch(63.1% 0.144 291.1)
-
Step 600
600
#765EC6
oklch(55.6% 0.156 291.1)
-
Step 700
700
#634DAB
oklch(49.1% 0.145 290.9)
-
Step 800
800
#51408B
oklch(42.8% 0.12 290.9)
-
Step 900
900 (this color)
#3F336B
oklch(36.4% 0.094 290.8)
-
Step 950
950
#272041
oklch(26.9% 0.06 291.6)
#3F336B 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) | #1D3D6D | 0.052 |
| Deuteranopia (no green cones) | #1E3B6A | 0.050 |
| Tritanopia (no blue cones) | #333E4A | 0.076 |
| Achromatopsia (no color) | #3C3C3C | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F336B
#3F336B
oklch(36.4% 0.094 290.8)
- #404100
#404100
oklch(36.2% 0.079 110.8)
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 #3F336B, 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 0.064
- Marine Blue #01386A ΔE 0.069
- Twilight Blue #0A437A ΔE 0.070
- Dark Grey Blue #29465B ΔE 0.074
- Blueberry #464196 ΔE 0.079
- Dark Blue Grey #1F3B4D ΔE 0.079
- Marine #042E60 ΔE 0.081
Use #3F336B 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.