#373575
Closest named color: Dark Slate Blue (#483D8B). oklch(36.7% 0.107 281.2), rgb(55, 53, 117).
Aa
White text reads best on this color (10.88:1).
About this color
#373575 is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.107 and its hue 281°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.051 away. White text reads best on it, at 10.88:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.92:1 |
| White text | 10.88:1 |
Values
| HEX | #373575 |
| RGB | rgb(55, 53, 117) |
| HSL | hsl(242, 38%, 33%) |
| OKLCH | oklch(36.7% 0.107 281.2) |
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 #373575 | 10.88:1 | AAA | Lc -98.9 | Preferred for body text |
| Black text on #373575 | 1.92:1 | Fails | Lc 8.9 | Not readable |
| #373575 text on white | 10.88:1 | AAA | Lc 95.0 | Preferred for body text |
| #373575 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
#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
#9396EE
oklch(70.7% 0.128 281.1)
-
Step 500
500
#7B79E9
oklch(63.1% 0.164 281.4)
-
Step 600
600
#655FD7
oklch(55.5% 0.178 281.1)
-
Step 700
700
#544EBA
oklch(49.1% 0.165 280.9)
-
Step 800
800
#454097
oklch(42.6% 0.138 281.4)
-
Step 900
900 (this color)
#373575
oklch(36.7% 0.107 281.2)
-
Step 950
950
#212146
oklch(26.9% 0.067 280.9)
#373575 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) | #143F77 | 0.045 |
| Deuteranopia (no green cones) | #0D3B74 | 0.047 |
| Tritanopia (no blue cones) | #1F434F | 0.092 |
| Achromatopsia (no color) | #3D3D3D | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #373575
#373575
oklch(36.7% 0.107 281.2)
- #484000
#484000
oklch(36.8% 0.077 101.4)
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 #373575, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.051
- Twilight Blue #0A437A ΔE 0.055
- Marine Blue #01386A ΔE 0.059
- Prussian Blue #1D3557 ΔE 0.066
- Cobalt #1E488F ΔE 0.066
- Blueberry #464196 ΔE 0.067
- Marine #042E60 ΔE 0.076
- Dark Grey Blue #29465B ΔE 0.077
Use #373575 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.