#3F3579
Closest named color: Dark Slate Blue (#483D8B). oklch(37.8% 0.112 286.5), rgb(63, 53, 121).
Aa
White text reads best on this color (10.51:1).
About this color
#3F3579 is a dark, moderately saturated purple. In OKLCH its lightness is 38%, its chroma 0.112 and its hue 286°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.039 away. White text reads best on it, at 10.51:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.99:1 |
| White text | 10.51:1 |
Values
| HEX | #3F3579 |
| RGB | rgb(63, 53, 121) |
| HSL | hsl(249, 39%, 34%) |
| OKLCH | oklch(37.8% 0.112 286.5) |
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 #3F3579 | 10.51:1 | AAA | Lc -98.2 | Preferred for body text |
| Black text on #3F3579 | 1.99:1 | Fails | Lc 9.7 | Not readable |
| #3F3579 text on white | 10.51:1 | AAA | Lc 94.2 | Preferred for body text |
| #3F3579 text on black | 1.99:1 | Fails | Lc -8.4 | 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
#F5F4FD
oklch(97% 0.012 291.3)
-
Step 100
100
#E8E8FA
oklch(93.6% 0.024 285.9)
-
Step 200
200
#D6D5F7
oklch(88.4% 0.047 286.8)
-
Step 300
300
#BCB9F5
oklch(80.9% 0.084 286.6)
-
Step 400
400
#9B93F0
oklch(70.8% 0.134 286.4)
-
Step 500
500
#8475EA
oklch(63.2% 0.17 286.3)
-
Step 600
600
#6F5AD8
oklch(55.6% 0.185 286.3)
-
Step 700
700
#5E49BC
oklch(49.2% 0.173 286.6)
-
Step 800
800
#4C3D98
oklch(42.8% 0.143 286.2)
-
Step 900
900 (this color)
#3F3579
oklch(37.8% 0.112 286.5)
-
Step 950
950
#252047
oklch(27.2% 0.07 286.6)
#3F3579 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) | #12417B | 0.058 |
| Deuteranopia (no green cones) | #103D78 | 0.058 |
| Tritanopia (no blue cones) | #2C4451 | 0.095 |
| Achromatopsia (no color) | #3F3F3F | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F3579
#3F3579
oklch(37.8% 0.112 286.5)
- #474400
#474400
oklch(37.7% 0.081 106.8)
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 #3F3579, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.039
- Blueberry #464196 ΔE 0.057
- Twilight Blue #0A437A ΔE 0.064
- Cobalt #1E488F ΔE 0.067
- Marine Blue #01386A ΔE 0.074
- Prussian Blue #1D3557 ΔE 0.080
- Light Navy #155084 ΔE 0.082
- Dark Grey Blue #29465B ΔE 0.084
Use #3F3579 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.