#3F2F66
Closest named color: Prussian Blue (#1D3557). oklch(35.2% 0.093 294.5), rgb(63, 47, 102).
Aa
White text reads best on this color (11.60:1).
About this color
#3F2F66 is a dark, moderately saturated purple. In OKLCH its lightness is 35%, its chroma 0.093 and its hue 295°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.062 away. White text reads best on it, at 11.60:1.
| Hue family | Purples |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.093) |
| Temperature | in between |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.80:1 |
| White text | 11.60:1 |
Values
| HEX | #3F2F66 |
| RGB | rgb(63, 47, 102) |
| HSL | hsl(257, 37%, 29%) |
| OKLCH | oklch(35.2% 0.093 294.5) |
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 #3F2F66 | 11.60:1 | AAA | Lc -100.2 | Preferred for body text |
| Black text on #3F2F66 | 1.80:1 | Fails | Lc 7.4 | Not readable |
| #3F2F66 text on white | 11.60:1 | AAA | Lc 96.5 | Preferred for body text |
| #3F2F66 text on black | 1.80:1 | 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
#F6F4FB
oklch(97.1% 0.009 299.2)
-
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
#C3B8EA
oklch(80.8% 0.071 294.9)
-
Step 400
400
#A592DF
oklch(70.6% 0.112 294.7)
-
Step 500
500
#9076D6
oklch(63.2% 0.142 294.5)
-
Step 600
600
#7B5CC3
oklch(55.6% 0.155 294.7)
-
Step 700
700
#684BA9
oklch(49.1% 0.145 294.7)
-
Step 800
800
#543E89
oklch(42.6% 0.12 294.2)
-
Step 900
900 (this color)
#3F2F66
oklch(35.2% 0.093 294.5)
-
Step 950
950
#292040
oklch(27.1% 0.059 295.2)
#3F2F66 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) | #1A3968 | 0.057 |
| Deuteranopia (no green cones) | #1D3865 | 0.054 |
| Tritanopia (no blue cones) | #363A45 | 0.076 |
| Achromatopsia (no color) | #393939 | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F2F66
#3F2F66
oklch(35.2% 0.093 294.5)
- #3A3F00
#3A3F00
oklch(35.1% 0.079 114.7)
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 #3F2F66, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.062
- Dark Slate Blue #483D8B ΔE 0.072
- Marine Blue #01386A ΔE 0.072
- Space Cadet #2B2D42 ΔE 0.074
- Marine #042E60 ΔE 0.078
- Dark Blue Grey #1F3B4D ΔE 0.079
- Twilight Blue #0A437A ΔE 0.079
- Gunmetal #293241 ΔE 0.079
Use #3F2F66 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.