#3F3663
Closest named color: Prussian Blue (#1D3557). oklch(36.4% 0.076 291.3), rgb(63, 54, 99).
Aa
White text reads best on this color (10.94:1).
About this color
#3F3663 is a dark, moderately saturated purple. In OKLCH its lightness is 36%, its chroma 0.076 and its hue 291°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.057 away. White text reads best on it, at 10.94:1.
| Hue family | Purples |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.076) |
| Temperature | in between |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.91:1 |
| White text | 10.94:1 |
Values
| HEX | #3F3663 |
| RGB | rgb(63, 54, 99) |
| HSL | hsl(252, 29%, 30%) |
| OKLCH | oklch(36.4% 0.076 291.3) |
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 #3F3663 | 10.94:1 | AAA | Lc -99.1 | Preferred for body text |
| Black text on #3F3663 | 1.91:1 | Fails | Lc 8.7 | Not readable |
| #3F3663 text on white | 10.94:1 | AAA | Lc 95.2 | Preferred for body text |
| #3F3663 text on black | 1.91:1 | Fails | Lc -7.4 | 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
#F5F5FA
oklch(97.2% 0.007 286.3)
-
Step 100
100
#EAE8F4
oklch(93.6% 0.016 293.7)
-
Step 200
200
#D9D6ED
oklch(88.5% 0.031 291.7)
-
Step 300
300
#C0BBE3
oklch(80.9% 0.056 290.8)
-
Step 400
400
#A197D6
oklch(70.8% 0.091 291.2)
-
Step 500
500
#8A7CCA
oklch(63.1% 0.116 290.9)
-
Step 600
600
#7563B7
oklch(55.5% 0.128 291.5)
-
Step 700
700
#62529E
oklch(49.1% 0.119 291.1)
-
Step 800
800
#504480
oklch(42.8% 0.097 290.9)
-
Step 900
900 (this color)
#3F3663
oklch(36.4% 0.076 291.3)
-
Step 950
950
#27223C
oklch(27.1% 0.048 291.7)
#3F3663 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) | #283D65 | 0.038 |
| Deuteranopia (no green cones) | #283C62 | 0.038 |
| Tritanopia (no blue cones) | #363E47 | 0.063 |
| Achromatopsia (no color) | #3D3D3D | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F3663
#3F3663
oklch(36.4% 0.076 291.3)
- #404206
#404206
oklch(36.5% 0.077 111.7)
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 #3F3663, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.057
- Dark Grey Blue #29465B ΔE 0.061
- Dark Blue Grey #1F3B4D ΔE 0.066
- Marine Blue #01386A ΔE 0.069
- Onyx #343A40 ΔE 0.070
- Twilight Blue #0A437A ΔE 0.070
- Dark Slate Blue #483D8B ΔE 0.070
- Charcoal #264653 ΔE 0.071
Use #3F3663 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.