#3F3B89
Closest named color: Dark Slate Blue (#483D8B). oklch(40.1% 0.126 281.4), rgb(63, 59, 137).
Aa
White text reads best on this color (9.55:1).
About this color
#3F3B89 is a dark, moderately saturated purple. In OKLCH its lightness is 40%, its chroma 0.126 and its hue 281°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.017 away. White text reads best on it, at 9.55:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.126) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.19:1 |
| White text | 9.55:1 |
Values
| HEX | #3F3B89 |
| RGB | rgb(63, 59, 137) |
| HSL | hsl(243, 40%, 38%) |
| OKLCH | oklch(40.1% 0.126 281.4) |
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 #3F3B89 | 9.55:1 | AAA | Lc -96.1 | Preferred for body text |
| Black text on #3F3B89 | 2.19:1 | Fails | Lc 12.1 | Not readable |
| #3F3B89 text on white | 9.55:1 | AAA | Lc 91.8 | Preferred for body text |
| #3F3B89 text on black | 2.19:1 | Fails | Lc -10.6 | 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
#F4F5FE
oklch(97.2% 0.012 281.1)
-
Step 100
100
#E6E8FC
oklch(93.5% 0.027 281.3)
-
Step 200
200
#D2D6FC
oklch(88.5% 0.052 280.5)
-
Step 300
300
#B6BAFD
oklch(81% 0.094 281.4)
-
Step 400
400
#9293FC
oklch(70.8% 0.151 281.4)
-
Step 500
500
#7A74F9
oklch(63.2% 0.193 281.4)
-
Step 600
600
#6557E8
oklch(55.5% 0.211 281.4)
-
Step 700
700
#5546CA
oklch(49.1% 0.196 281.6)
-
Step 800
800
#453BA3
oklch(42.7% 0.161 281.5)
-
Step 900
900 (this color)
#3F3B89
oklch(40.1% 0.126 281.4)
-
Step 950
950
#211F4C
oklch(26.9% 0.081 281.5)
#3F3B89 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) | #08488C | 0.058 |
| Deuteranopia (no green cones) | #004287 | 0.059 |
| Tritanopia (no blue cones) | #204D5C | 0.108 |
| Achromatopsia (no color) | #454545 | 0.127 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F3B89
#3F3B89
oklch(40.1% 0.126 281.4)
- #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 #3F3B89, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.017
- Blueberry #464196 ΔE 0.029
- Cobalt #1E488F ΔE 0.048
- Twilight Blue #0A437A ΔE 0.064
- Twilight #4E518B ΔE 0.067
- Dusk Blue #26538D ΔE 0.068
- Sapphire #2138AB ΔE 0.069
- Light Navy #155084 ΔE 0.070
Use #3F3B89 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.