#00387C
Closest named color: Marine Blue (#01386A). oklch(35.4% 0.127 257.3), rgb(0, 56, 124).
Aa
White text reads best on this color (11.31:1).
About this color
#00387C is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.127 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.031 away. White text reads best on it, at 11.31:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.127) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.85:1 |
| White text | 11.31:1 |
Values
| HEX | #00387C |
| RGB | rgb(0, 56, 124) |
| HSL | hsl(213, 100%, 24%) |
| OKLCH | oklch(35.4% 0.127 257.3) |
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 #00387C | 11.31:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #00387C | 1.85:1 | Fails | Lc 8.5 | Not readable |
| #00387C text on white | 11.31:1 | AAA | Lc 95.4 | Preferred for body text |
| #00387C text on black | 1.85:1 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DFEBFD
oklch(93.6% 0.028 258.4)
-
Step 200
200
#C4DBFD
oklch(88.5% 0.053 258)
-
Step 300
300
#99C3FE
oklch(80.9% 0.095 256.9)
-
Step 400
400
#5FA1FE
oklch(70.7% 0.153 257.2)
-
Step 500
500
#2D86FC
oklch(63.2% 0.195 257.3)
-
Step 600
600
#006DE5
oklch(55.6% 0.201 257.4)
-
Step 700
700
#005BC2
oklch(49% 0.177 257.5)
-
Step 800
800
#004BA0
oklch(42.8% 0.152 257.1)
-
Step 900
900 (this color)
#00387C
oklch(35.4% 0.127 257.3)
-
Step 950
950
#08254D
oklch(26.9% 0.082 257.6)
#00387C 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) | #01407E | 0.023 |
| Deuteranopia (no green cones) | #00357B | 0.009 |
| Tritanopia (no blue cones) | #004954 | 0.096 |
| Achromatopsia (no color) | #3A3A3A | 0.127 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00387C
#00387C
oklch(35.4% 0.127 257.3)
- #513600
#513600
oklch(35.5% 0.074 77.7)
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 #00387C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.031
- Twilight Blue #0A437A ΔE 0.034
- Marine #042E60 ΔE 0.055
- Cobalt #1E488F ΔE 0.060
- Prussian Blue #1D3557 ΔE 0.065
- Light Navy #155084 ΔE 0.074
- Royal #0C1793 ΔE 0.076
- Midnight Blue #191970 ΔE 0.077
Use #00387C 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.