#3F3066
Closest named color: Prussian Blue (#1D3557). oklch(35.4% 0.091 294), rgb(63, 48, 102).
Aa
White text reads best on this color (11.50:1).
About this color
#3F3066 is a dark, moderately saturated purple. In OKLCH its lightness is 35%, its chroma 0.091 and its hue 294°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.061 away. White text reads best on it, at 11.50:1.
| Hue family | Purples |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.091) |
| Temperature | in between |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.82:1 |
| White text | 11.50:1 |
Values
| HEX | #3F3066 |
| RGB | rgb(63, 48, 102) |
| HSL | hsl(257, 36%, 29%) |
| OKLCH | oklch(35.4% 0.091 294) |
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 #3F3066 | 11.50:1 | AAA | Lc -100.0 | Preferred for body text |
| Black text on #3F3066 | 1.82:1 | Fails | Lc 7.6 | Not readable |
| #3F3066 text on white | 11.50:1 | AAA | Lc 96.3 | Preferred for body text |
| #3F3066 text on black | 1.82:1 | 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
#EAE8F6
oklch(93.7% 0.019 292.6)
-
Step 200
200
#DAD5F1
oklch(88.6% 0.038 293.8)
-
Step 300
300
#C2B9E9
oklch(80.9% 0.068 293.4)
-
Step 400
400
#A493DE
oklch(70.7% 0.109 293.8)
-
Step 500
500
#8F76D5
oklch(63% 0.14 294.1)
-
Step 600
600
#7A5DC2
oklch(55.6% 0.152 294.1)
-
Step 700
700
#674CA8
oklch(49.1% 0.142 294.1)
-
Step 800
800
#543F88
oklch(42.7% 0.117 294.1)
-
Step 900
900 (this color)
#3F3066
oklch(35.4% 0.091 294)
-
Step 950
950
#282040
oklch(27% 0.059 293.6)
#3F3066 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) | #1C3A68 | 0.055 |
| Deuteranopia (no green cones) | #1F3865 | 0.051 |
| Tritanopia (no blue cones) | #363B46 | 0.074 |
| Achromatopsia (no color) | #393939 | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F3066
#3F3066
oklch(35.4% 0.091 294)
- #3B4000
#3B4000
oklch(35.5% 0.08 114.7)
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 #3F3066, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.061
- Dark Slate Blue #483D8B ΔE 0.071
- Marine Blue #01386A ΔE 0.071
- Space Cadet #2B2D42 ΔE 0.074
- Twilight Blue #0A437A ΔE 0.077
- Dark Blue Grey #1F3B4D ΔE 0.077
- Dark Grey Blue #29465B ΔE 0.078
- Marine #042E60 ΔE 0.078
Use #3F3066 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.