#03729D
Closest named color: Ocean Blue (#03719C). oklch(52% 0.108 233.8), rgb(3, 114, 157).
Aa
White text reads best on this color (5.38:1).
About this color
#03729D is a medium-dark, moderately saturated blue. In OKLCH its lightness is 52%, its chroma 0.108 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Ocean Blue (#03719C), ΔE 0.003 away. White text reads best on it, at 5.38:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Ocean Blue (#03719C) |
| Black text | 3.89:1 |
| White text | 5.38:1 |
Values
| HEX | #03729D |
| RGB | rgb(3, 114, 157) |
| HSL | hsl(197, 96%, 31%) |
| OKLCH | oklch(52% 0.108 233.8) |
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 #03729D | 5.38:1 | AA | Lc -81.6 | Fine for body text |
| Black text on #03729D | 3.89:1 | AA large text | Lc 27.8 | Dividers and decoration only |
| #03729D text on white | 5.38:1 | AA | Lc 76.3 | Fine for body text |
| #03729D text on black | 3.89:1 | AA large text | Lc -25.5 | 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
#E1ECF3
oklch(93.7% 0.015 235.4)
-
Step 200
200
#C7DDEA
oklch(88.5% 0.03 233.6)
-
Step 300
300
#A0C7DD
oklch(80.9% 0.052 233)
-
Step 400
400
#6AAACD
oklch(70.8% 0.083 233.6)
-
Step 500
500
#3B94C0
oklch(63.2% 0.106 233.6)
-
Step 600
600
#017DAC
oklch(55.6% 0.116 233.8)
-
Step 700
700 (this color)
#03729D
oklch(52% 0.108 233.8)
-
Step 800
800
#005678
oklch(42.7% 0.089 233.9)
-
Step 900
900
#114761
oklch(37.7% 0.07 234.5)
-
Step 950
950
#0D2A39
oklch(27.1% 0.044 234.3)
#03729D 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) | #5C719F | 0.066 |
| Deuteranopia (no green cones) | #4A659C | 0.054 |
| Tritanopia (no blue cones) | #007D81 | 0.064 |
| Achromatopsia (no color) | #6A6A6A | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #03729D
#03729D
oklch(52% 0.108 233.8)
- #985625
#985625
oklch(52.1% 0.107 54.1)
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 #03729D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Ocean Blue #03719C ΔE 0.003
- Sea Blue #047495 ΔE 0.016
- Muted Blue #3B719F ΔE 0.029
- Peacock Blue #016795 ΔE 0.033
- Nice Blue #107AB0 ΔE 0.035
- Ocean #017B92 ΔE 0.036
- Flat Blue #3C73A8 ΔE 0.037
- Dull Blue #49759C ΔE 0.045
Use #03729D 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.