#3F3879
Closest named color: Dark Slate Blue (#483D8B). oklch(38.3% 0.107 285.1), rgb(63, 56, 121).
Aa
White text reads best on this color (10.22:1).
About this color
#3F3879 is a dark, moderately saturated purple. In OKLCH its lightness is 38%, its chroma 0.107 and its hue 285°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.036 away. White text reads best on it, at 10.22:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.05:1 |
| White text | 10.22:1 |
Values
| HEX | #3F3879 |
| RGB | rgb(63, 56, 121) |
| HSL | hsl(246, 37%, 35%) |
| OKLCH | oklch(38.3% 0.107 285.1) |
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 #3F3879 | 10.22:1 | AAA | Lc -97.6 | Preferred for body text |
| Black text on #3F3879 | 2.05:1 | Fails | Lc 10.4 | Not readable |
| #3F3879 text on white | 10.22:1 | AAA | Lc 93.5 | Preferred for body text |
| #3F3879 text on black | 2.05:1 | Fails | Lc -9.0 | 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
#F4F5FD
oklch(97.2% 0.011 280.5)
-
Step 100
100
#E8E8F9
oklch(93.6% 0.023 286)
-
Step 200
200
#D5D6F6
oklch(88.5% 0.044 284)
-
Step 300
300
#BBBAF3
oklch(81% 0.08 285.3)
-
Step 400
400
#9994ED
oklch(70.7% 0.128 285.2)
-
Step 500
500
#8277E7
oklch(63.2% 0.164 285.2)
-
Step 600
600
#6D5DD5
oklch(55.7% 0.177 285.1)
-
Step 700
700
#5B4BB9
oklch(49.1% 0.167 285.1)
-
Step 800
800
#4A3F95
oklch(42.7% 0.136 284.9)
-
Step 900
900 (this color)
#3F3879
oklch(38.3% 0.107 285.1)
-
Step 950
950
#242046
oklch(27% 0.069 285.6)
#3F3879 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) | #1A437B | 0.051 |
| Deuteranopia (no green cones) | #173F78 | 0.051 |
| Tritanopia (no blue cones) | #2C4653 | 0.090 |
| Achromatopsia (no color) | #414141 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F3879
#3F3879
oklch(38.3% 0.107 285.1)
- #4A4500
#4A4500
oklch(38.3% 0.081 104.9)
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 #3F3879, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.036
- Blueberry #464196 ΔE 0.054
- Twilight Blue #0A437A ΔE 0.060
- Cobalt #1E488F ΔE 0.062
- Marine Blue #01386A ΔE 0.074
- Light Navy #155084 ΔE 0.075
- Twilight #4E518B ΔE 0.078
- Dark Grey Blue #29465B ΔE 0.079
Use #3F3879 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.