#3F347F
Closest named color: Dark Slate Blue (#483D8B). oklch(38% 0.122 285.7), rgb(63, 52, 127).
Aa
White text reads best on this color (10.45:1).
About this color
#3F347F is a dark, moderately saturated purple. In OKLCH its lightness is 38%, its chroma 0.122 and its hue 286°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.034 away. White text reads best on it, at 10.45:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.00:1 |
| White text | 10.45:1 |
Values
| HEX | #3F347F |
| RGB | rgb(63, 52, 127) |
| HSL | hsl(249, 42%, 35%) |
| OKLCH | oklch(38% 0.122 285.7) |
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 #3F347F | 10.45:1 | AAA | Lc -98.0 | Preferred for body text |
| Black text on #3F347F | 2.00:1 | Fails | Lc 10.0 | Not readable |
| #3F347F text on white | 10.45:1 | AAA | Lc 94.0 | Preferred for body text |
| #3F347F text on black | 2.00:1 | Fails | Lc -8.6 | 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
#F4F4FE
oklch(97% 0.013 286.1)
-
Step 100
100
#E8E8FB
oklch(93.7% 0.026 285.9)
-
Step 200
200
#D5D5FA
oklch(88.5% 0.051 285.3)
-
Step 300
300
#BBB8FA
oklch(80.8% 0.093 286.2)
-
Step 400
400
#9991F7
oklch(70.7% 0.146 285.6)
-
Step 500
500
#8372F3
oklch(63.1% 0.186 285.8)
-
Step 600
600
#6E56E2
oklch(55.6% 0.203 285.6)
-
Step 700
700
#5D45C4
oklch(49.1% 0.188 285.8)
-
Step 800
800
#4B3A9F
oklch(42.7% 0.156 285.4)
-
Step 900
900 (this color)
#3F347F
oklch(38% 0.122 285.7)
-
Step 950
950
#241F4A
oklch(27.1% 0.077 285.3)
#3F347F 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) | #014282 | 0.066 |
| Deuteranopia (no green cones) | #003D7D | 0.065 |
| Tritanopia (no blue cones) | #294554 | 0.102 |
| Achromatopsia (no color) | #3F3F3F | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F347F
#3F347F
oklch(38% 0.122 285.7)
- #494400
#494400
oklch(38% 0.08 104.9)
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 #3F347F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.034
- Blueberry #464196 ΔE 0.051
- Cobalt #1E488F ΔE 0.065
- Twilight Blue #0A437A ΔE 0.067
- Marine Blue #01386A ΔE 0.078
- Indigo #4B0082 ΔE 0.082
- Sapphire #2138AB ΔE 0.083
- Rebecca Purple #663399 ΔE 0.083
Use #3F347F 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.