#3A3774
Closest named color: Dark Slate Blue (#483D8B). oklch(37.3% 0.102 282.5), rgb(58, 55, 116).
Aa
White text reads best on this color (10.61:1).
About this color
#3A3774 is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.102 and its hue 283°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.048 away. White text reads best on it, at 10.61:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.97:1 |
| White text | 10.61:1 |
Values
| HEX | #3A3774 |
| RGB | rgb(58, 55, 116) |
| HSL | hsl(243, 36%, 34%) |
| OKLCH | oklch(37.3% 0.102 282.5) |
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 #3A3774 | 10.61:1 | AAA | Lc -98.4 | Preferred for body text |
| Black text on #3A3774 | 1.97:1 | Fails | Lc 9.5 | Not readable |
| #3A3774 text on white | 10.61:1 | AAA | Lc 94.4 | Preferred for body text |
| #3A3774 text on black | 1.97:1 | Fails | Lc -8.1 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E7E8F9
oklch(93.5% 0.023 283.3)
-
Step 200
200
#D4D6F5
oklch(88.4% 0.043 282.6)
-
Step 300
300
#B9BBF1
oklch(80.9% 0.076 282.9)
-
Step 400
400
#9696EA
oklch(70.7% 0.122 282.8)
-
Step 500
500
#7D7AE4
oklch(63.1% 0.156 282.3)
-
Step 600
600
#6860D2
oklch(55.6% 0.17 282.5)
-
Step 700
700
#574FB6
oklch(49.2% 0.158 282.4)
-
Step 800
800
#474193
oklch(42.7% 0.131 282.7)
-
Step 900
900 (this color)
#3A3774
oklch(37.3% 0.102 282.5)
-
Step 950
950
#222145
oklch(26.9% 0.066 282.3)
#3A3774 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) | #1B4176 | 0.044 |
| Deuteranopia (no green cones) | #173C73 | 0.044 |
| Tritanopia (no blue cones) | #264450 | 0.086 |
| Achromatopsia (no color) | #3E3E3E | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A3774
#3A3774
oklch(37.3% 0.102 282.5)
- #494200
#494200
oklch(37.4% 0.079 102.7)
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 #3A3774, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.048
- Twilight Blue #0A437A ΔE 0.055
- Marine Blue #01386A ΔE 0.063
- Blueberry #464196 ΔE 0.064
- Cobalt #1E488F ΔE 0.065
- Prussian Blue #1D3557 ΔE 0.067
- Dark Grey Blue #29465B ΔE 0.072
- Light Navy #155084 ΔE 0.076
Use #3A3774 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.