#373663
Closest named color: Prussian Blue (#1D3557). oklch(35.7% 0.077 282.8), rgb(55, 54, 99).
Aa
White text reads best on this color (11.22:1).
About this color
#373663 is a dark, moderately saturated purple. In OKLCH its lightness is 36%, its chroma 0.077 and its hue 283°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.044 away. White text reads best on it, at 11.22:1.
| Hue family | Purples |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.077) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.87:1 |
| White text | 11.22:1 |
Values
| HEX | #373663 |
| RGB | rgb(55, 54, 99) |
| HSL | hsl(241, 29%, 30%) |
| OKLCH | oklch(35.7% 0.077 282.8) |
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 #373663 | 11.22:1 | AAA | Lc -99.6 | Preferred for body text |
| Black text on #373663 | 1.87:1 | Fails | Lc 8.1 | Not readable |
| #373663 text on white | 11.22:1 | AAA | Lc 95.8 | Preferred for body text |
| #373663 text on black | 1.87:1 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E8E9F5
oklch(93.7% 0.016 282.3)
-
Step 200
200
#D5D7EE
oklch(88.5% 0.032 281.8)
-
Step 300
300
#BBBDE6
oklch(81% 0.058 282.8)
-
Step 400
400
#9899D9
oklch(70.6% 0.093 283.1)
-
Step 500
500
#807FCE
oklch(63.1% 0.117 283.1)
-
Step 600
600
#6A67BB
oklch(55.6% 0.128 283)
-
Step 700
700
#5855A1
oklch(49% 0.119 282.9)
-
Step 800
800
#484683
oklch(42.7% 0.099 282.8)
-
Step 900
900 (this color)
#373663
oklch(35.7% 0.077 282.8)
-
Step 950
950
#23233D
oklch(27% 0.048 282.7)
#373663 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) | #263C65 | 0.028 |
| Deuteranopia (no green cones) | #243962 | 0.028 |
| Tritanopia (no blue cones) | #2A3F47 | 0.067 |
| Achromatopsia (no color) | #3B3B3B | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #373663
#373663
oklch(35.7% 0.077 282.8)
- #443D00
#443D00
oklch(35.6% 0.075 102.2)
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 #373663, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.044
- Marine Blue #01386A ΔE 0.055
- Dark Grey Blue #29465B ΔE 0.057
- Dark Blue Grey #1F3B4D ΔE 0.057
- Twilight Blue #0A437A ΔE 0.062
- Space Cadet #2B2D42 ΔE 0.065
- Gunmetal #293241 ΔE 0.065
- Charcoal #264653 ΔE 0.067
Use #373663 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.