#3F3F82
Closest named color: Dark Slate Blue (#483D8B). oklch(40.4% 0.11 280.3), rgb(63, 63, 130).
Aa
White text reads best on this color (9.35:1).
About this color
#3F3F82 is a dark, moderately saturated purple. In OKLCH its lightness is 40%, its chroma 0.110 and its hue 280°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.022 away. White text reads best on it, at 9.35:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.24:1 |
| White text | 9.35:1 |
Values
| HEX | #3F3F82 |
| RGB | rgb(63, 63, 130) |
| HSL | hsl(240, 35%, 38%) |
| OKLCH | oklch(40.4% 0.11 280.3) |
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 #3F3F82 | 9.35:1 | AAA | Lc -95.7 | Preferred for body text |
| Black text on #3F3F82 | 2.24:1 | Fails | Lc 12.5 | Not readable |
| #3F3F82 text on white | 9.35:1 | AAA | Lc 91.4 | Preferred for body text |
| #3F3F82 text on black | 2.24:1 | Fails | Lc -10.9 | 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 800.
-
Step 50
50
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E7E9F6
oklch(93.6% 0.018 279.1)
-
Step 200
200
#D4D7F1
oklch(88.5% 0.036 280.4)
-
Step 300
300
#B8BDEA
oklch(81% 0.064 279.9)
-
Step 400
400
#9499E0
oklch(70.7% 0.104 280.3)
-
Step 500
500
#7B7FD7
oklch(63.2% 0.131 280)
-
Step 600
600
#6566C4
oklch(55.5% 0.143 280.2)
-
Step 700
700
#5454A9
oklch(49% 0.133 280.3)
-
Step 800
800 (this color)
#3F3F82
oklch(40.4% 0.11 280.3)
-
Step 900
900
#3A3B6E
oklch(37.8% 0.086 280.6)
-
Step 950
950
#222340
oklch(27.1% 0.053 280.7)
#3F3F82 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) | #204984 | 0.043 |
| Deuteranopia (no green cones) | #1A4481 | 0.044 |
| Tritanopia (no blue cones) | #254E5A | 0.096 |
| Achromatopsia (no color) | #474747 | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F3F82
#3F3F82
oklch(40.4% 0.11 280.3)
- #534900
#534900
oklch(40.3% 0.084 100.4)
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 #3F3F82, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.022
- Blueberry #464196 ΔE 0.035
- Cobalt #1E488F ΔE 0.046
- Twilight Blue #0A437A ΔE 0.057
- Twilight #4E518B ΔE 0.058
- Dusk Blue #26538D ΔE 0.059
- Light Navy #155084 ΔE 0.060
- Dusk #4E5481 ΔE 0.067
Use #3F3F82 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.