#04577B
Closest named color: Deep Sea Blue (#015482). oklch(43.2% 0.091 235.7), rgb(4, 87, 123).
Aa
White text reads best on this color (7.91:1).
About this color
#04577B is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.091 and its hue 236°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.017 away. White text reads best on it, at 7.91:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.65:1 |
| White text | 7.91:1 |
Values
| HEX | #04577B |
| RGB | rgb(4, 87, 123) |
| HSL | hsl(198, 94%, 25%) |
| OKLCH | oklch(43.2% 0.091 235.7) |
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 #04577B | 7.91:1 | AAA | Lc -91.7 | Preferred for body text |
| Black text on #04577B | 2.65:1 | Fails | Lc 17.1 | Dividers and decoration only |
| #04577B text on white | 7.91:1 | AAA | Lc 86.9 | Fine for body text |
| #04577B text on black | 2.65:1 | Fails | Lc -15.2 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1ECF3
oklch(93.7% 0.015 235.4)
-
Step 200
200
#C7DDEA
oklch(88.5% 0.03 233.6)
-
Step 300
300
#A0C7DF
oklch(81% 0.054 235.3)
-
Step 400
400
#6AA9CE
oklch(70.6% 0.085 235.5)
-
Step 500
500
#3B93C2
oklch(63.1% 0.109 235.7)
-
Step 600
600
#047DAE
oklch(55.7% 0.117 235.1)
-
Step 700
700
#006994
oklch(49.2% 0.105 235.5)
-
Step 800
800 (this color)
#04577B
oklch(43.2% 0.091 235.7)
-
Step 900
900
#124762
oklch(37.8% 0.071 235.8)
-
Step 950
950
#0D2A39
oklch(27.1% 0.044 234.3)
#04577B 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) | #45577D | 0.053 |
| Deuteranopia (no green cones) | #364D7A | 0.042 |
| Tritanopia (no blue cones) | #006063 | 0.056 |
| Achromatopsia (no color) | #515151 | 0.091 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #04577B
#04577B
oklch(43.2% 0.091 235.7)
- #754117
#754117
oklch(43.1% 0.09 55.7)
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 #04577B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.017
- Light Navy #155084 ΔE 0.029
- Light Navy Blue #2E5A88 ΔE 0.036
- Dusk Blue #26538D ΔE 0.040
- Petrol #005F6A ΔE 0.044
- YInMn Blue #415A77 ΔE 0.049
- Deep Teal #00555A ΔE 0.056
- Denim Blue #3B5B92 ΔE 0.058
Use #04577B 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.