#04579F
Closest named color: Dusk Blue (#26538D). oklch(45.5% 0.136 252.5), rgb(4, 87, 159).
Aa
White text reads best on this color (7.31:1).
About this color
#04579F is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.136 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.032 away. White text reads best on it, at 7.31:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.86:1 |
| White text | 7.31:1 |
Values
| HEX | #04579F |
| RGB | rgb(4, 87, 159) |
| HSL | hsl(208, 95%, 32%) |
| OKLCH | oklch(45.5% 0.136 252.5) |
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 #04579F | 7.31:1 | AAA | Lc -89.7 | Fine for body text |
| Black text on #04579F | 2.86:1 | Fails | Lc 19.2 | Dividers and decoration only |
| #04579F text on white | 7.31:1 | AAA | Lc 84.8 | Fine for body text |
| #04579F text on black | 2.86:1 | Fails | Lc -17.2 | Dividers and decoration only |
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 800.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#DFEBF9
oklch(93.5% 0.023 252.2)
-
Step 200
200
#C5DCF6
oklch(88.6% 0.044 251.5)
-
Step 300
300
#9CC4F3
oklch(80.8% 0.079 252.8)
-
Step 400
400
#63A4ED
oklch(70.6% 0.127 252.5)
-
Step 500
500
#318BE8
oklch(63% 0.163 252.7)
-
Step 600
600
#0074D2
oklch(55.7% 0.168 252.4)
-
Step 700
700
#0061B1
oklch(49.1% 0.148 252.3)
-
Step 800
800 (this color)
#04579F
oklch(45.5% 0.136 252.5)
-
Step 900
900
#0A4277
oklch(37.6% 0.105 252.3)
-
Step 950
950
#0A2746
oklch(27% 0.067 252.9)
#04579F 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) | #305DA2 | 0.034 |
| Deuteranopia (no green cones) | #0B509E | 0.019 |
| Tritanopia (no blue cones) | #006873 | 0.099 |
| Achromatopsia (no color) | #565656 | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #04579F
#04579F
oklch(45.5% 0.136 252.5)
- #774C00
#774C00
oklch(45.4% 0.097 72.2)
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 #04579F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.032
- Light Navy #155084 ΔE 0.046
- Denim Blue #3B5B92 ΔE 0.046
- Cobalt #1E488F ΔE 0.046
- Light Navy Blue #2E5A88 ΔE 0.046
- Deep Sea Blue #015482 ΔE 0.048
- Peacock Blue #016795 ΔE 0.053
- Dusky Blue #475F94 ΔE 0.062
Use #04579F 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.