#373571
Closest named color: Twilight Blue (#0A437A). oklch(36.4% 0.1 281.7), rgb(55, 53, 113).
Aa
White text reads best on this color (10.99:1).
About this color
#373571 is a dark, moderately saturated purple. In OKLCH its lightness is 36%, its chroma 0.100 and its hue 282°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.055 away. White text reads best on it, at 10.99:1.
| Hue family | Purples |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.91:1 |
| White text | 10.99:1 |
Values
| HEX | #373571 |
| RGB | rgb(55, 53, 113) |
| HSL | hsl(242, 36%, 33%) |
| OKLCH | oklch(36.4% 0.1 281.7) |
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 #373571 | 10.99:1 | AAA | Lc -99.1 | Preferred for body text |
| Black text on #373571 | 1.91:1 | Fails | Lc 8.6 | Not readable |
| #373571 text on white | 10.99:1 | AAA | Lc 95.3 | Preferred for body text |
| #373571 text on black | 1.91:1 | Fails | Lc -7.4 | 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
#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
#B8BBF1
oklch(80.8% 0.076 282.1)
-
Step 400
400
#9497EA
oklch(70.7% 0.121 281.3)
-
Step 500
500
#7C7AE3
oklch(63% 0.155 281.9)
-
Step 600
600
#6761D1
oklch(55.6% 0.167 281.9)
-
Step 700
700
#564FB5
oklch(49% 0.156 282.1)
-
Step 800
800
#464293
oklch(42.8% 0.129 281.7)
-
Step 900
900 (this color)
#373571
oklch(36.4% 0.1 281.7)
-
Step 950
950
#222244
oklch(27.1% 0.062 281.4)
#373571 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) | #193E73 | 0.042 |
| Deuteranopia (no green cones) | #143A70 | 0.043 |
| Tritanopia (no blue cones) | #22424D | 0.087 |
| Achromatopsia (no color) | #3C3C3C | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #373571
#373571
oklch(36.4% 0.1 281.7)
- #473F00
#473F00
oklch(36.5% 0.076 101.3)
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 #373571, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.055
- Dark Slate Blue #483D8B ΔE 0.056
- Marine Blue #01386A ΔE 0.057
- Prussian Blue #1D3557 ΔE 0.060
- Cobalt #1E488F ΔE 0.070
- Dark Grey Blue #29465B ΔE 0.072
- Marine #042E60 ΔE 0.073
- Blueberry #464196 ΔE 0.073
Use #373571 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.