#373768
Closest named color: Prussian Blue (#1D3557). oklch(36.2% 0.083 281.4), rgb(55, 55, 104).
Aa
White text reads best on this color (11.00:1).
About this color
#373768 is a dark, moderately saturated purple. In OKLCH its lightness is 36%, its chroma 0.083 and its hue 281°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.049 away. White text reads best on it, at 11.00:1.
| Hue family | Purples |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.90:1 |
| White text | 11.00:1 |
Values
| HEX | #373768 |
| RGB | rgb(55, 55, 104) |
| HSL | hsl(240, 31%, 31%) |
| OKLCH | oklch(36.2% 0.083 281.4) |
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 #373768 | 11.00:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #373768 | 1.90:1 | Fails | Lc 8.6 | Not readable |
| #373768 text on white | 11.00:1 | AAA | Lc 95.3 | Preferred for body text |
| #373768 text on black | 1.90:1 | Fails | Lc -7.3 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E7E9F6
oklch(93.6% 0.018 279.1)
-
Step 200
200
#D5D7F0
oklch(88.5% 0.034 282)
-
Step 300
300
#B9BDE9
oklch(81% 0.062 280.8)
-
Step 400
400
#9699DE
oklch(70.7% 0.1 281.6)
-
Step 500
500
#7D7ED4
oklch(63% 0.128 281.6)
-
Step 600
600
#6766C2
oklch(55.6% 0.14 281.3)
-
Step 700
700
#5654A7
oklch(49% 0.13 281.6)
-
Step 800
800
#464587
oklch(42.6% 0.107 281.5)
-
Step 900
900 (this color)
#373768
oklch(36.2% 0.083 281.4)
-
Step 950
950
#22233F
oklch(27% 0.052 280.8)
#373768 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) | #243E6A | 0.031 |
| Deuteranopia (no green cones) | #213A67 | 0.031 |
| Tritanopia (no blue cones) | #27414A | 0.072 |
| Achromatopsia (no color) | #3C3C3C | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #373768
#373768
oklch(36.2% 0.083 281.4)
- #463E00
#463E00
oklch(36.1% 0.075 101.2)
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 #373768, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.049
- Marine Blue #01386A ΔE 0.055
- Twilight Blue #0A437A ΔE 0.057
- Dark Grey Blue #29465B ΔE 0.058
- Dark Blue Grey #1F3B4D ΔE 0.063
- Dark Slate Blue #483D8B ΔE 0.067
- Charcoal #264653 ΔE 0.070
- Marine #042E60 ΔE 0.070
Use #373768 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.