#3A3571
Closest named color: Dark Slate Blue (#483D8B). oklch(36.7% 0.1 284.1), rgb(58, 53, 113).
Aa
White text reads best on this color (10.89:1).
About this color
#3A3571 is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.100 and its hue 284°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.054 away. White text reads best on it, at 10.89:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.92:1 |
| White text | 10.89:1 |
Values
| HEX | #3A3571 |
| RGB | rgb(58, 53, 113) |
| HSL | hsl(245, 36%, 33%) |
| OKLCH | oklch(36.7% 0.1 284.1) |
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 #3A3571 | 10.89:1 | AAA | Lc -98.9 | Preferred for body text |
| Black text on #3A3571 | 1.92:1 | Fails | Lc 8.9 | Not readable |
| #3A3571 text on white | 10.89:1 | AAA | Lc 95.0 | Preferred for body text |
| #3A3571 text on black | 1.92:1 | Fails | Lc -7.6 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E8E8F8
oklch(93.6% 0.022 286)
-
Step 200
200
#D5D6F4
oklch(88.5% 0.041 284)
-
Step 300
300
#BABBF0
oklch(81% 0.074 283.8)
-
Step 400
400
#9896E9
oklch(70.8% 0.12 284)
-
Step 500
500
#8079E2
oklch(63.1% 0.154 284.1)
-
Step 600
600
#6B60D0
oklch(55.7% 0.167 284)
-
Step 700
700
#594EB4
oklch(49% 0.156 283.9)
-
Step 800
800
#494191
oklch(42.7% 0.127 284.1)
-
Step 900
900 (this color)
#3A3571
oklch(36.7% 0.1 284.1)
-
Step 950
950
#232144
oklch(27% 0.064 283.9)
#3A3571 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) | #1A3F73 | 0.046 |
| Deuteranopia (no green cones) | #173B70 | 0.046 |
| Tritanopia (no blue cones) | #28424D | 0.086 |
| Achromatopsia (no color) | #3D3D3D | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A3571
#3A3571
oklch(36.7% 0.1 284.1)
- #464000
#464000
oklch(36.6% 0.077 103.5)
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 #3A3571, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.054
- Twilight Blue #0A437A ΔE 0.059
- Marine Blue #01386A ΔE 0.062
- Prussian Blue #1D3557 ΔE 0.064
- Blueberry #464196 ΔE 0.071
- Cobalt #1E488F ΔE 0.071
- Dark Grey Blue #29465B ΔE 0.073
- Marine #042E60 ΔE 0.077
Use #3A3571 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.