#373770
Closest named color: Twilight Blue (#0A437A). oklch(36.8% 0.096 280.6), rgb(55, 55, 112).
Aa
White text reads best on this color (10.80:1).
About this color
#373770 is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.096 and its hue 281°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.052 away. White text reads best on it, at 10.80:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.94:1 |
| White text | 10.80:1 |
Values
| HEX | #373770 |
| RGB | rgb(55, 55, 112) |
| HSL | hsl(240, 34%, 33%) |
| OKLCH | oklch(36.8% 0.096 280.6) |
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 #373770 | 10.80:1 | AAA | Lc -98.8 | Preferred for body text |
| Black text on #373770 | 1.94:1 | Fails | Lc 9.0 | Not readable |
| #373770 text on white | 10.80:1 | AAA | Lc 94.9 | Preferred for body text |
| #373770 text on black | 1.94:1 | Fails | Lc -7.7 | 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
#E7E9F8
oklch(93.7% 0.02 279.9)
-
Step 200
200
#D4D7F4
oklch(88.6% 0.04 280.9)
-
Step 300
300
#B7BCEF
oklch(80.9% 0.072 280.3)
-
Step 400
400
#9398E7
oklch(70.7% 0.115 280.2)
-
Step 500
500
#7B7CE0
oklch(63.1% 0.148 280.9)
-
Step 600
600
#6563CD
oklch(55.6% 0.16 280.7)
-
Step 700
700
#5451B2
oklch(49% 0.15 280.7)
-
Step 800
800
#454390
oklch(42.7% 0.124 281)
-
Step 900
900 (this color)
#373770
oklch(36.8% 0.096 280.6)
-
Step 950
950
#212243
oklch(26.9% 0.061 280.2)
#373770 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) | #1E4072 | 0.038 |
| Deuteranopia (no green cones) | #193B6F | 0.038 |
| Tritanopia (no blue cones) | #22434E | 0.082 |
| Achromatopsia (no color) | #3D3D3D | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #373770
#373770
oklch(36.8% 0.096 280.6)
- #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 #373770, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.052
- Dark Slate Blue #483D8B ΔE 0.056
- Marine Blue #01386A ΔE 0.056
- Prussian Blue #1D3557 ΔE 0.059
- Dark Grey Blue #29465B ΔE 0.067
- Cobalt #1E488F ΔE 0.068
- Blueberry #464196 ΔE 0.072
- Marine #042E60 ΔE 0.074
Use #373770 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.