#04598D
Closest named color: Deep Sea Blue (#015482). oklch(44.8% 0.11 244.7), rgb(4, 89, 141).
Aa
White text reads best on this color (7.45:1).
About this color
#04598D is a dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.110 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.022 away. White text reads best on it, at 7.45:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.81:1 |
| White text | 7.45:1 |
Values
| HEX | #04598D |
| RGB | rgb(4, 89, 141) |
| HSL | hsl(203, 94%, 28%) |
| OKLCH | oklch(44.8% 0.11 244.7) |
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 #04598D | 7.45:1 | AAA | Lc -90.2 | Preferred for body text |
| Black text on #04598D | 2.81:1 | Fails | Lc 18.7 | Dividers and decoration only |
| #04598D text on white | 7.45:1 | AAA | Lc 85.3 | Fine for body text |
| #04598D text on black | 2.81:1 | Fails | Lc -16.7 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E0ECF6
oklch(93.7% 0.019 243)
-
Step 200
200
#C6DCF0
oklch(88.4% 0.036 245.7)
-
Step 300
300
#9EC6E8
oklch(80.9% 0.064 244.3)
-
Step 400
400
#66A7DD
oklch(70.7% 0.104 245.1)
-
Step 500
500
#3590D3
oklch(63.1% 0.132 244.7)
-
Step 600
600
#0079BE
oklch(55.6% 0.139 244.6)
-
Step 700
700
#0066A1
oklch(49.2% 0.123 244.5)
-
Step 800
800 (this color)
#04598D
oklch(44.8% 0.11 244.7)
-
Step 900
900
#0D456C
oklch(37.7% 0.086 245)
-
Step 950
950
#0B293F
oklch(27.1% 0.054 244.1)
#04598D 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) | #405B8F | 0.045 |
| Deuteranopia (no green cones) | #2C508C | 0.031 |
| Tritanopia (no blue cones) | #00666C | 0.077 |
| Achromatopsia (no color) | #555555 | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #04598D
#04598D
oklch(44.8% 0.11 244.7)
- #7A4700
#7A4700
oklch(44.8% 0.101 65.1)
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 #04598D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.022
- Dusk Blue #26538D ΔE 0.022
- Light Navy Blue #2E5A88 ΔE 0.026
- Light Navy #155084 ΔE 0.028
- Denim Blue #3B5B92 ΔE 0.040
- Peacock Blue #016795 ΔE 0.042
- Cobalt #1E488F ΔE 0.049
- Denim #3B638C ΔE 0.051
Use #04598D 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.