#373963
Closest named color: Prussian Blue (#1D3557). oklch(36.4% 0.072 280.1), rgb(55, 57, 99).
Aa
White text reads best on this color (10.89:1).
About this color
#373963 is a dark, moderately saturated purple. In OKLCH its lightness is 36%, its chroma 0.072 and its hue 280°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.046 away. White text reads best on it, at 10.89:1.
| Hue family | Purples |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.072) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.92:1 |
| White text | 10.89:1 |
Values
| HEX | #373963 |
| RGB | rgb(55, 57, 99) |
| HSL | hsl(237, 29%, 30%) |
| OKLCH | oklch(36.4% 0.072 280.1) |
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 #373963 | 10.89:1 | AAA | Lc -99.0 | Preferred for body text |
| Black text on #373963 | 1.92:1 | Fails | Lc 8.8 | Not readable |
| #373963 text on white | 10.89:1 | AAA | Lc 95.2 | Preferred for body text |
| #373963 text on black | 1.92:1 | Fails | Lc -7.5 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E7E9F4
oklch(93.6% 0.015 277.8)
-
Step 200
200
#D5D7ED
oklch(88.4% 0.03 281.6)
-
Step 300
300
#B9BDE4
oklch(80.8% 0.055 280.5)
-
Step 400
400
#969BD6
oklch(70.8% 0.086 280.2)
-
Step 500
500
#7D81CB
oklch(63.1% 0.111 280.4)
-
Step 600
600
#676AB8
oklch(55.8% 0.12 280.1)
-
Step 700
700
#55589E
oklch(49.1% 0.111 279.6)
-
Step 800
800
#464880
oklch(42.7% 0.092 280.2)
-
Step 900
900 (this color)
#373963
oklch(36.4% 0.072 280.1)
-
Step 950
950
#22243C
oklch(27.1% 0.045 279.3)
#373963 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) | #2A3E65 | 0.022 |
| Deuteranopia (no green cones) | #283B62 | 0.022 |
| Tritanopia (no blue cones) | #294149 | 0.062 |
| Achromatopsia (no color) | #3D3D3D | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #373963
#373963
oklch(36.4% 0.072 280.1)
- #473E06
#473E06
oklch(36.2% 0.071 99.4)
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 #373963, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.046
- Dark Grey Blue #29465B ΔE 0.049
- Dark Blue Grey #1F3B4D ΔE 0.054
- Marine Blue #01386A ΔE 0.056
- Twilight Blue #0A437A ΔE 0.058
- Charcoal #264653 ΔE 0.059
- Onyx #343A40 ΔE 0.064
- Gunmetal #293241 ΔE 0.066
Use #373963 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.