#3F3763
Closest named color: Prussian Blue (#1D3557). oklch(36.7% 0.075 290.6), rgb(63, 55, 99).
Aa
White text reads best on this color (10.83:1).
About this color
#3F3763 is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.075 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 10.83:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.075) |
| Temperature | in between |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.93:1 |
| White text | 10.83:1 |
Values
| HEX | #3F3763 |
| RGB | rgb(63, 55, 99) |
| HSL | hsl(251, 29%, 30%) |
| OKLCH | oklch(36.7% 0.075 290.6) |
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 #3F3763 | 10.83:1 | AAA | Lc -98.9 | Preferred for body text |
| Black text on #3F3763 | 1.93:1 | Fails | Lc 8.9 | Not readable |
| #3F3763 text on white | 10.83:1 | AAA | Lc 95.0 | Preferred for body text |
| #3F3763 text on black | 1.93:1 | Fails | Lc -7.6 | 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
#E9E8F4
oklch(93.5% 0.016 289.9)
-
Step 200
200
#D8D6ED
oklch(88.5% 0.031 289.7)
-
Step 300
300
#C0BBE3
oklch(80.9% 0.056 290.8)
-
Step 400
400
#A097D5
oklch(70.7% 0.09 290.6)
-
Step 500
500
#897CC9
oklch(63% 0.114 290.5)
-
Step 600
600
#7464B6
oklch(55.5% 0.125 290.7)
-
Step 700
700
#61539D
oklch(49.1% 0.116 290.2)
-
Step 800
800
#4F447F
oklch(42.6% 0.096 290.3)
-
Step 900
900 (this color)
#3F3763
oklch(36.7% 0.075 290.6)
-
Step 950
950
#26223C
oklch(27% 0.048 289.9)
#3F3763 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) | #293E65 | 0.036 |
| Deuteranopia (no green cones) | #2A3C62 | 0.034 |
| Tritanopia (no blue cones) | #363F48 | 0.061 |
| Achromatopsia (no color) | #3D3D3D | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F3763
#3F3763
oklch(36.7% 0.075 290.6)
- #414209
#414209
oklch(36.7% 0.074 110.6)
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 #3F3763, 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 0.058
- Dark Blue Grey #1F3B4D ΔE 0.065
- Marine Blue #01386A ΔE 0.069
- Onyx #343A40 ΔE 0.069
- Charcoal #264653 ΔE 0.069
- Twilight Blue #0A437A ΔE 0.069
- Dark Slate Blue #483D8B ΔE 0.070
Use #3F3763 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.