#04739A
Closest named color: Ocean Blue (#03719C). oklch(52.1% 0.104 231), rgb(4, 115, 154).
Aa
White text reads best on this color (5.35:1).
About this color
#04739A is a medium-dark, moderately saturated blue. In OKLCH its lightness is 52%, its chroma 0.104 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Ocean Blue (#03719C), ΔE 0.008 away. White text reads best on it, at 5.35:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Ocean Blue (#03719C) |
| Black text | 3.92:1 |
| White text | 5.35:1 |
Values
| HEX | #04739A |
| RGB | rgb(4, 115, 154) |
| HSL | hsl(196, 95%, 31%) |
| OKLCH | oklch(52.1% 0.104 231) |
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 #04739A | 5.35:1 | AA | Lc -81.4 | Fine for body text |
| Black text on #04739A | 3.92:1 | AA large text | Lc 28.0 | Dividers and decoration only |
| #04739A text on white | 5.35:1 | AA | Lc 76.1 | Fine for body text |
| #04739A text on black | 3.92:1 | AA large text | Lc -25.6 | 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 700.
-
Step 50
50
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF2
oklch(93.7% 0.014 231.2)
-
Step 200
200
#C7DDE9
oklch(88.5% 0.029 231.5)
-
Step 300
300
#A0C7DC
oklch(80.8% 0.051 231.7)
-
Step 400
400
#6AAACA
oklch(70.7% 0.081 231.2)
-
Step 500
500
#3B94BC
oklch(63% 0.103 231.1)
-
Step 600
600
#017EA9
oklch(55.6% 0.112 231.3)
-
Step 700
700 (this color)
#04739A
oklch(52.1% 0.104 231)
-
Step 800
800
#005775
oklch(42.8% 0.086 230.3)
-
Step 900
900
#11485F
oklch(37.8% 0.067 230.8)
-
Step 950
950
#0D2A37
oklch(27% 0.042 230.5)
#04739A 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) | #5F729C | 0.069 |
| Deuteranopia (no green cones) | #4D6599 | 0.058 |
| Tritanopia (no blue cones) | #007E80 | 0.061 |
| Achromatopsia (no color) | #6B6B6B | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #04739A
#04739A
oklch(52.1% 0.104 231)
- #98562C
#98562C
oklch(52.2% 0.104 51.1)
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 #04739A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Ocean Blue #03719C ΔE 0.008
- Sea Blue #047495 ΔE 0.009
- Ocean #017B92 ΔE 0.031
- Muted Blue #3B719F ΔE 0.031
- Peacock Blue #016795 ΔE 0.036
- Nice Blue #107AB0 ΔE 0.038
- Flat Blue #3C73A8 ΔE 0.039
- Dull Blue #49759C ΔE 0.044
Use #04739A 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.