#00376C
Closest named color: Marine Blue (#01386A). oklch(33.8% 0.106 253.5), rgb(0, 55, 108).
Aa
White text reads best on this color (11.91:1).
About this color
#00376C is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.106 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.005 away. White text reads best on it, at 11.91:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.76:1 |
| White text | 11.91:1 |
Values
| HEX | #00376C |
| RGB | rgb(0, 55, 108) |
| HSL | hsl(209, 100%, 21%) |
| OKLCH | oklch(33.8% 0.106 253.5) |
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 #00376C | 11.91:1 | AAA | Lc -100.4 | Preferred for body text |
| Black text on #00376C | 1.76:1 | Fails | Lc 0.0 | Not readable |
| #00376C text on white | 11.91:1 | AAA | Lc 96.7 | Preferred for body text |
| #00376C text on black | 1.76:1 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C5DBF6
oklch(88.4% 0.044 253.6)
-
Step 300
300
#9DC4F3
oklch(80.9% 0.079 253.4)
-
Step 400
400
#65A4EE
oklch(70.8% 0.127 253.5)
-
Step 500
500
#358BE8
oklch(63.1% 0.162 253.3)
-
Step 600
600
#0072D5
oklch(55.5% 0.175 253.6)
-
Step 700
700
#0060B4
oklch(49.1% 0.153 253.4)
-
Step 800
800
#004E95
oklch(42.6% 0.134 253.6)
-
Step 900
900 (this color)
#00376C
oklch(33.8% 0.106 253.5)
-
Step 950
950
#0B2746
oklch(27% 0.067 253.4)
#00376C 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) | #193C6E | 0.025 |
| Deuteranopia (no green cones) | #00336B | 0.012 |
| Tritanopia (no blue cones) | #00444C | 0.078 |
| Achromatopsia (no color) | #373737 | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00376C
#00376C
oklch(33.8% 0.106 253.5)
- #4D3100
#4D3100
oklch(33.9% 0.072 74.4)
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 #00376C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.005
- Marine #042E60 ΔE 0.032
- Prussian Blue #1D3557 ΔE 0.040
- Twilight Blue #0A437A ΔE 0.043
- Midnight Green #073B4C ΔE 0.061
- Dark Blue Grey #1F3B4D ΔE 0.062
- Dark Grey Blue #29465B ΔE 0.072
- Midnight Blue #191970 ΔE 0.075
Use #00376C 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.