#004579
Closest named color: Twilight Blue (#0A437A). oklch(38.3% 0.107 249.4), rgb(0, 69, 121).
Aa
White text reads best on this color (9.87:1).
About this color
#004579 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.107 and its hue 249°. 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 9.87:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.12:1 |
| White text | 9.87:1 |
Values
| HEX | #004579 |
| RGB | rgb(0, 69, 121) |
| HSL | hsl(206, 100%, 24%) |
| OKLCH | oklch(38.3% 0.107 249.4) |
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 #004579 | 9.87:1 | AAA | Lc -96.5 | Preferred for body text |
| Black text on #004579 | 2.12:1 | Fails | Lc 11.6 | Not readable |
| #004579 text on white | 9.87:1 | AAA | Lc 92.3 | Preferred for body text |
| #004579 text on black | 2.12:1 | Fails | Lc -10.1 | 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
#DFECF9
oklch(93.7% 0.022 248.1)
-
Step 200
200
#C3DCF6
oklch(88.4% 0.045 249.4)
-
Step 300
300
#99C5F3
oklch(80.9% 0.08 250)
-
Step 400
400
#5CA6ED
oklch(70.8% 0.128 249.2)
-
Step 500
500
#1F8DE7
oklch(63% 0.164 249.4)
-
Step 600
600
#0076C9
oklch(55.6% 0.155 249.4)
-
Step 700
700
#0063AA
oklch(49.1% 0.137 249.4)
-
Step 800
800
#00518C
oklch(42.7% 0.118 249.2)
-
Step 900
900 (this color)
#004579
oklch(38.3% 0.107 249.4)
-
Step 950
950
#052846
oklch(27.1% 0.068 249.1)
#004579 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) | #2A497B | 0.033 |
| Deuteranopia (no green cones) | #153F78 | 0.018 |
| Tritanopia (no blue cones) | #005259 | 0.077 |
| Achromatopsia (no color) | #434343 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #004579
#004579
oklch(38.3% 0.107 249.4)
- #5F3A00
#5F3A00
oklch(38.4% 0.083 70)
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 #004579, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.007
- Light Navy #155084 ΔE 0.039
- Cobalt #1E488F ΔE 0.043
- Marine Blue #01386A ΔE 0.045
- Deep Sea Blue #015482 ΔE 0.046
- Dark Grey Blue #29465B ΔE 0.058
- Dusk Blue #26538D ΔE 0.059
- Prussian Blue #1D3557 ΔE 0.069
Use #004579 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.