#3A3879
Closest named color: Dark Slate Blue (#483D8B). oklch(37.9% 0.108 281.3), rgb(58, 56, 121).
Aa
White text reads best on this color (10.38:1).
About this color
#3A3879 is a dark, moderately saturated purple. In OKLCH its lightness is 38%, its chroma 0.108 and its hue 281°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.040 away. White text reads best on it, at 10.38:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.02:1 |
| White text | 10.38:1 |
Values
| HEX | #3A3879 |
| RGB | rgb(58, 56, 121) |
| HSL | hsl(242, 37%, 35%) |
| OKLCH | oklch(37.9% 0.108 281.3) |
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 #3A3879 | 10.38:1 | AAA | Lc -97.9 | Preferred for body text |
| Black text on #3A3879 | 2.02:1 | Fails | Lc 10.0 | Not readable |
| #3A3879 text on white | 10.38:1 | AAA | Lc 93.9 | Preferred for body text |
| #3A3879 text on black | 2.02:1 | 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
#F4F5FD
oklch(97.2% 0.011 280.5)
-
Step 100
100
#E7E8FA
oklch(93.6% 0.024 283.4)
-
Step 200
200
#D3D6F7
oklch(88.4% 0.045 281.3)
-
Step 300
300
#B7BBF4
oklch(80.9% 0.08 281.3)
-
Step 400
400
#9396EF
oklch(70.7% 0.129 281.1)
-
Step 500
500
#7B79E9
oklch(63.1% 0.164 281.4)
-
Step 600
600
#665FD8
oklch(55.7% 0.18 281.4)
-
Step 700
700
#554DBB
oklch(49.1% 0.167 281.6)
-
Step 800
800
#454097
oklch(42.6% 0.138 281.4)
-
Step 900
900 (this color)
#3A3879
oklch(37.9% 0.108 281.3)
-
Step 950
950
#212146
oklch(26.9% 0.067 280.9)
#3A3879 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) | #18427B | 0.045 |
| Deuteranopia (no green cones) | #123E78 | 0.047 |
| Tritanopia (no blue cones) | #224653 | 0.092 |
| Achromatopsia (no color) | #404040 | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A3879
#3A3879
oklch(37.9% 0.108 281.3)
- #4B4300
#4B4300
oklch(37.9% 0.079 101.7)
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 #3A3879, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.040
- Twilight Blue #0A437A ΔE 0.053
- Blueberry #464196 ΔE 0.056
- Cobalt #1E488F ΔE 0.058
- Marine Blue #01386A ΔE 0.066
- Light Navy #155084 ΔE 0.072
- Prussian Blue #1D3557 ΔE 0.074
- Dark Grey Blue #29465B ΔE 0.076
Use #3A3879 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.