#372E63
Closest named color: Prussian Blue (#1D3557). oklch(34% 0.09 288.5), rgb(55, 46, 99).
Aa
White text reads best on this color (12.11:1).
About this color
#372E63 is a dark, moderately saturated purple. In OKLCH its lightness is 34%, its chroma 0.090 and its hue 288°. 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 12.11:1.
| Hue family | Purples |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.73:1 |
| White text | 12.11:1 |
Values
| HEX | #372E63 |
| RGB | rgb(55, 46, 99) |
| HSL | hsl(250, 37%, 28%) |
| OKLCH | oklch(34% 0.09 288.5) |
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 #372E63 | 12.11:1 | AAA | Lc -101.1 | Preferred for body text |
| Black text on #372E63 | 1.73:1 | Fails | Lc 0.0 | Not readable |
| #372E63 text on white | 12.11:1 | AAA | Lc 97.5 | Preferred for body text |
| #372E63 text on black | 1.73:1 | Fails | Lc 0.0 | 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
#F5F5FB
oklch(97.2% 0.008 286.3)
-
Step 100
100
#E9E8F7
oklch(93.6% 0.02 289.1)
-
Step 200
200
#D7D6F1
oklch(88.5% 0.037 287.3)
-
Step 300
300
#BEBAEA
oklch(80.8% 0.067 288.6)
-
Step 400
400
#9E95E0
oklch(70.7% 0.108 288.8)
-
Step 500
500
#8779D7
oklch(63% 0.138 288.6)
-
Step 600
600
#7261C5
oklch(55.7% 0.15 288.4)
-
Step 700
700
#604FAA
oklch(49.1% 0.14 288.8)
-
Step 800
800
#4E418A
oklch(42.7% 0.117 288.6)
-
Step 900
900 (this color)
#372E63
oklch(34% 0.09 288.5)
-
Step 950
950
#262140
oklch(27% 0.057 289.5)
#372E63 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) | #183765 | 0.047 |
| Deuteranopia (no green cones) | #183562 | 0.046 |
| Tritanopia (no blue cones) | #2A3944 | 0.075 |
| Achromatopsia (no color) | #363636 | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #372E63
#372E63
oklch(34% 0.09 288.5)
- #3C3A00
#3C3A00
oklch(33.9% 0.073 107.6)
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 #372E63, 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 0.060
- Marine #042E60 ΔE 0.063
- Space Cadet #2B2D42 ΔE 0.063
- Gunmetal #293241 ΔE 0.070
- Dark Blue Grey #1F3B4D ΔE 0.070
- Twilight Blue #0A437A ΔE 0.075
- Dark Grey Blue #29465B ΔE 0.079
Use #372E63 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.