#3F3D88
Closest named color: Dark Slate Blue (#483D8B). oklch(40.4% 0.122 280.7), rgb(63, 61, 136).
Aa
White text reads best on this color (9.39:1).
About this color
#3F3D88 is a dark, moderately saturated purple. In OKLCH its lightness is 40%, its chroma 0.122 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 9.39:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.23:1 |
| White text | 9.39:1 |
Values
| HEX | #3F3D88 |
| RGB | rgb(63, 61, 136) |
| HSL | hsl(242, 38%, 39%) |
| OKLCH | oklch(40.4% 0.122 280.7) |
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 #3F3D88 | 9.39:1 | AAA | Lc -95.8 | Preferred for body text |
| Black text on #3F3D88 | 2.23:1 | Fails | Lc 12.5 | Not readable |
| #3F3D88 text on white | 9.39:1 | AAA | Lc 91.5 | Preferred for body text |
| #3F3D88 text on black | 2.23:1 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E7E9F8
oklch(93.7% 0.02 279.9)
-
Step 200
200
#D4D7F3
oklch(88.6% 0.039 280.7)
-
Step 300
300
#B8BCEE
oklch(80.9% 0.071 281.1)
-
Step 400
400
#9498E6
oklch(70.7% 0.113 280.8)
-
Step 500
500
#7B7CDF
oklch(63.1% 0.146 280.9)
-
Step 600
600
#6563CC
oklch(55.5% 0.158 280.8)
-
Step 700
700
#5452B1
oklch(49.2% 0.147 280.5)
-
Step 800
800 (this color)
#3F3D88
oklch(40.4% 0.122 280.7)
-
Step 900
900
#393A72
oklch(37.7% 0.094 280.1)
-
Step 950
950
#212243
oklch(26.9% 0.061 280.2)
#3F3D88 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) | #12498B | 0.053 |
| Deuteranopia (no green cones) | #084486 | 0.055 |
| Tritanopia (no blue cones) | #204E5C | 0.106 |
| Achromatopsia (no color) | #464646 | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F3D88
#3F3D88
oklch(40.4% 0.122 280.7)
- #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 #3F3D88, 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 0.028
- Cobalt #1E488F ΔE 0.045
- Twilight Blue #0A437A ΔE 0.062
- Twilight #4E518B ΔE 0.062
- Dusk Blue #26538D ΔE 0.063
- Light Navy #155084 ΔE 0.065
- Sapphire #2138AB ΔE 0.071
Use #3F3D88 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.