#004C73
Closest named color: Twilight Blue (#0A437A). oklch(39.8% 0.092 240.4), rgb(0, 76, 115).
Aa
White text reads best on this color (9.20:1).
About this color
#004C73 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.092 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.032 away. White text reads best on it, at 9.20:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.28:1 |
| White text | 9.20:1 |
Values
| HEX | #004C73 |
| RGB | rgb(0, 76, 115) |
| HSL | hsl(200, 100%, 23%) |
| OKLCH | oklch(39.8% 0.092 240.4) |
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 #004C73 | 9.20:1 | AAA | Lc -95.1 | Preferred for body text |
| Black text on #004C73 | 2.28:1 | Fails | Lc 13.3 | Not readable |
| #004C73 text on white | 9.20:1 | AAA | Lc 90.7 | Preferred for body text |
| #004C73 text on black | 2.28:1 | Fails | Lc -11.6 | 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
#F0F6FB
oklch(97% 0.009 242.8)
-
Step 100
100
#DFECF6
oklch(93.6% 0.019 240.7)
-
Step 200
200
#C3DDF0
oklch(88.4% 0.038 239.6)
-
Step 300
300
#99C7E9
oklch(80.9% 0.068 240.7)
-
Step 400
400
#5BA9DE
oklch(70.7% 0.11 240.5)
-
Step 500
500
#1592D5
oklch(63% 0.14 240.4)
-
Step 600
600
#007BB6
oklch(55.6% 0.128 240.2)
-
Step 700
700
#00679A
oklch(49.1% 0.113 240.5)
-
Step 800
800
#00547F
oklch(42.6% 0.099 240.7)
-
Step 900
900 (this color)
#004C73
oklch(39.8% 0.092 240.4)
-
Step 950
950
#042940
oklch(26.9% 0.059 241.5)
#004C73 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) | #394D75 | 0.045 |
| Deuteranopia (no green cones) | #2A4372 | 0.035 |
| Tritanopia (no blue cones) | #00565A | 0.061 |
| Achromatopsia (no color) | #484848 | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #004C73
#004C73
oklch(39.8% 0.092 240.4)
- #6A3902
#6A3902
oklch(39.8% 0.092 60.1)
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 #004C73, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.032
- Deep Sea Blue #015482 ΔE 0.032
- Light Navy #155084 ΔE 0.032
- Dark Grey Blue #29465B ΔE 0.045
- Cobalt #1E488F ΔE 0.054
- Dusk Blue #26538D ΔE 0.054
- Charcoal #264653 ΔE 0.055
- Deep Teal #00555A ΔE 0.058
Use #004C73 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.