#004377
Closest named color: Twilight Blue (#0A437A). oklch(37.7% 0.106 249.9), rgb(0, 67, 119).
Aa
White text reads best on this color (10.14:1).
About this color
#004377 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.106 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.007 away. White text reads best on it, at 10.14:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.06:1 |
| White text | 10.14:1 |
Values
| HEX | #004377 |
| RGB | rgb(0, 67, 119) |
| HSL | hsl(206, 100%, 23%) |
| OKLCH | oklch(37.7% 0.106 249.9) |
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 #004377 | 10.14:1 | AAA | Lc -97.1 | Preferred for body text |
| Black text on #004377 | 2.06:1 | Fails | Lc 11.0 | Not readable |
| #004377 text on white | 10.14:1 | AAA | Lc 93.0 | Preferred for body text |
| #004377 text on black | 2.06:1 | Fails | Lc -9.5 | 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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DFEBF9
oklch(93.5% 0.023 252.2)
-
Step 200
200
#C4DCF6
oklch(88.5% 0.044 250.4)
-
Step 300
300
#99C5F3
oklch(80.9% 0.08 250)
-
Step 400
400
#5EA6ED
oklch(70.8% 0.127 249.8)
-
Step 500
500
#248DE7
oklch(63.1% 0.163 249.9)
-
Step 600
600
#0076CA
oklch(55.7% 0.156 249.7)
-
Step 700
700
#0063AB
oklch(49.2% 0.138 249.7)
-
Step 800
800
#00518D
oklch(42.7% 0.12 249.5)
-
Step 900
900 (this color)
#004377
oklch(37.7% 0.106 249.9)
-
Step 950
950
#062846
oklch(27.1% 0.068 249.6)
#004377 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) | #284779 | 0.032 |
| Deuteranopia (no green cones) | #123D76 | 0.018 |
| Tritanopia (no blue cones) | #005057 | 0.077 |
| Achromatopsia (no color) | #414141 | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #004377
#004377
oklch(37.7% 0.106 249.9)
- #5D3800
#5D3800
oklch(37.7% 0.082 69.1)
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 #004377, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.007
- Marine Blue #01386A ΔE 0.038
- Light Navy #155084 ΔE 0.046
- Cobalt #1E488F ΔE 0.047
- Deep Sea Blue #015482 ΔE 0.053
- Dark Grey Blue #29465B ΔE 0.057
- Prussian Blue #1D3557 ΔE 0.064
- Dusk Blue #26538D ΔE 0.065
Use #004377 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.