#3A3978
Closest named color: Dark Slate Blue (#483D8B). oklch(38% 0.105 280.9), rgb(58, 57, 120).
Aa
White text reads best on this color (10.31:1).
About this color
#3A3978 is a dark, moderately saturated purple. In OKLCH its lightness is 38%, its chroma 0.105 and its hue 281°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.041 away. White text reads best on it, at 10.31:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.03:1 |
| White text | 10.31:1 |
Values
| HEX | #3A3978 |
| RGB | rgb(58, 57, 120) |
| HSL | hsl(241, 36%, 35%) |
| OKLCH | oklch(38% 0.105 280.9) |
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 #3A3978 | 10.31:1 | AAA | Lc -97.8 | Preferred for body text |
| Black text on #3A3978 | 2.03:1 | Fails | Lc 10.2 | Not readable |
| #3A3978 text on white | 10.31:1 | AAA | Lc 93.7 | Preferred for body text |
| #3A3978 text on black | 2.03:1 | Fails | Lc -8.8 | 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
#E7E8F9
oklch(93.5% 0.023 283.3)
-
Step 200
200
#D3D6F6
oklch(88.4% 0.044 281.2)
-
Step 300
300
#B7BBF3
oklch(80.8% 0.079 281.3)
-
Step 400
400
#9396ED
oklch(70.6% 0.126 281.1)
-
Step 500
500
#7A7AE7
oklch(63.1% 0.16 280.8)
-
Step 600
600
#6560D5
oklch(55.6% 0.174 281)
-
Step 700
700
#544FB9
oklch(49.2% 0.162 280.7)
-
Step 800
800
#454195
oklch(42.7% 0.134 281.2)
-
Step 900
900 (this color)
#3A3978
oklch(38% 0.105 280.9)
-
Step 950
950
#212146
oklch(26.9% 0.067 280.9)
#3A3978 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) | #1B437A | 0.043 |
| Deuteranopia (no green cones) | #163E77 | 0.044 |
| Tritanopia (no blue cones) | #234753 | 0.090 |
| Achromatopsia (no color) | #404040 | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A3978
#3A3978
oklch(38% 0.105 280.9)
- #4C4300
#4C4300
oklch(38% 0.079 100.7)
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 #3A3978, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.041
- Twilight Blue #0A437A ΔE 0.052
- Blueberry #464196 ΔE 0.057
- Cobalt #1E488F ΔE 0.058
- Marine Blue #01386A ΔE 0.065
- Light Navy #155084 ΔE 0.070
- Prussian Blue #1D3557 ΔE 0.073
- Dark Grey Blue #29465B ΔE 0.073
Use #3A3978 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.