#3F3377
Closest named color: Dark Slate Blue (#483D8B). oklch(37.2% 0.112 287.8), rgb(63, 51, 119).
Aa
White text reads best on this color (10.76:1).
About this color
#3F3377 is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.112 and its hue 288°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.044 away. White text reads best on it, at 10.76:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.95:1 |
| White text | 10.76:1 |
Values
| HEX | #3F3377 |
| RGB | rgb(63, 51, 119) |
| HSL | hsl(251, 40%, 33%) |
| OKLCH | oklch(37.2% 0.112 287.8) |
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 #3F3377 | 10.76:1 | AAA | Lc -98.6 | Preferred for body text |
| Black text on #3F3377 | 1.95:1 | Fails | Lc 9.2 | Not readable |
| #3F3377 text on white | 10.76:1 | AAA | Lc 94.7 | Preferred for body text |
| #3F3377 text on black | 1.95:1 | Fails | Lc -7.9 | 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
#F5F4FD
oklch(97% 0.012 291.3)
-
Step 100
100
#E8E8FA
oklch(93.6% 0.024 285.9)
-
Step 200
200
#D7D5F7
oklch(88.5% 0.047 288.1)
-
Step 300
300
#BDB9F4
oklch(81% 0.083 287.5)
-
Step 400
400
#9D92EF
oklch(70.7% 0.134 287.9)
-
Step 500
500
#8774EA
oklch(63.2% 0.171 287.9)
-
Step 600
600
#7259D8
oklch(55.7% 0.186 287.8)
-
Step 700
700
#6048BB
oklch(49.1% 0.173 287.9)
-
Step 800
800
#4E3C97
oklch(42.7% 0.143 287.9)
-
Step 900
900 (this color)
#3F3377
oklch(37.2% 0.112 287.8)
-
Step 950
950
#251F47
oklch(26.9% 0.072 287.4)
#3F3377 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) | #0F3F79 | 0.061 |
| Deuteranopia (no green cones) | #0F3C76 | 0.060 |
| Tritanopia (no blue cones) | #2E424F | 0.094 |
| Achromatopsia (no color) | #3E3E3E | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F3377
#3F3377
oklch(37.2% 0.112 287.8)
- #454300
#454300
oklch(37.3% 0.08 107.8)
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 #3F3377, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.044
- Blueberry #464196 ΔE 0.062
- Twilight Blue #0A437A ΔE 0.067
- Cobalt #1E488F ΔE 0.072
- Marine Blue #01386A ΔE 0.073
- Prussian Blue #1D3557 ΔE 0.078
- Indigo #4B0082 ΔE 0.083
- Dark Grey Blue #29465B ΔE 0.086
Use #3F3377 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.