#3F3C88
Closest named color: Dark Slate Blue (#483D8B). oklch(40.2% 0.123 281.1), rgb(63, 60, 136).
Aa
White text reads best on this color (9.48:1).
About this color
#3F3C88 is a dark, moderately saturated purple. In OKLCH its lightness is 40%, its chroma 0.123 and its hue 281°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.016 away. White text reads best on it, at 9.48:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.21:1 |
| White text | 9.48:1 |
Values
| HEX | #3F3C88 |
| RGB | rgb(63, 60, 136) |
| HSL | hsl(242, 39%, 38%) |
| OKLCH | oklch(40.2% 0.123 281.1) |
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 #3F3C88 | 9.48:1 | AAA | Lc -96.0 | Preferred for body text |
| Black text on #3F3C88 | 2.21:1 | Fails | Lc 12.3 | Not readable |
| #3F3C88 text on white | 9.48:1 | AAA | Lc 91.7 | Preferred for body text |
| #3F3C88 text on black | 2.21:1 | Fails | Lc -10.7 | 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 800.
-
Step 50
50
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E7E9F8
oklch(93.7% 0.02 279.9)
-
Step 200
200
#D4D7F4
oklch(88.6% 0.04 280.9)
-
Step 300
300
#B8BCEF
oklch(81% 0.072 281.2)
-
Step 400
400
#9498E7
oklch(70.8% 0.115 280.8)
-
Step 500
500
#7B7CDF
oklch(63.1% 0.146 280.9)
-
Step 600
600
#6663CD
oklch(55.6% 0.159 281.2)
-
Step 700
700
#5551B2
oklch(49.1% 0.15 281.2)
-
Step 800
800 (this color)
#3F3C88
oklch(40.2% 0.123 281.1)
-
Step 900
900
#3A3973
oklch(37.7% 0.097 281.5)
-
Step 950
950
#222243
oklch(27% 0.06 281.6)
#3F3C88 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) | #0F488B | 0.054 |
| Deuteranopia (no green cones) | #034386 | 0.058 |
| Tritanopia (no blue cones) | #214D5C | 0.105 |
| Achromatopsia (no color) | #464646 | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F3C88
#3F3C88
oklch(40.2% 0.123 281.1)
- #524900
#524900
oklch(40.2% 0.084 101.3)
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 #3F3C88, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.016
- Blueberry #464196 ΔE 0.029
- Cobalt #1E488F ΔE 0.047
- Twilight Blue #0A437A ΔE 0.062
- Twilight #4E518B ΔE 0.065
- Dusk Blue #26538D ΔE 0.065
- Light Navy #155084 ΔE 0.067
- Sapphire #2138AB ΔE 0.071
Use #3F3C88 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.