#03437A
Closest named color: Twilight Blue (#0A437A). oklch(38% 0.11 251.6), rgb(3, 67, 122).
Aa
White text reads best on this color (10.05:1).
About this color
#03437A is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.110 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.003 away. White text reads best on it, at 10.05:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.08:1 |
| White text | 10.05:1 |
Values
| HEX | #03437A |
| RGB | rgb(3, 67, 122) |
| HSL | hsl(208, 95%, 25%) |
| OKLCH | oklch(38% 0.11 251.6) |
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 #03437A | 10.05:1 | AAA | Lc -97.0 | Preferred for body text |
| Black text on #03437A | 2.08:1 | Fails | Lc 11.2 | Not readable |
| #03437A text on white | 10.05:1 | AAA | Lc 92.8 | Preferred for body text |
| #03437A text on black | 2.08:1 | Fails | Lc -9.7 | Not readable |
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 900.
-
Step 50
50
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DFEBFA
oklch(93.6% 0.024 254)
-
Step 200
200
#C4DCF7
oklch(88.5% 0.045 251.4)
-
Step 300
300
#9AC5F5
oklch(81% 0.082 251.6)
-
Step 400
400
#5EA5F0
oklch(70.8% 0.132 251.3)
-
Step 500
500
#268CEB
oklch(63.2% 0.168 251.5)
-
Step 600
600
#0074CF
oklch(55.5% 0.165 251.7)
-
Step 700
700
#0062AF
oklch(49.2% 0.144 251.3)
-
Step 800
800
#005091
oklch(42.8% 0.126 251.5)
-
Step 900
900 (this color)
#03437A
oklch(38% 0.11 251.6)
-
Step 950
950
#072747
oklch(26.9% 0.07 252)
#03437A 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) | #26477C | 0.029 |
| Deuteranopia (no green cones) | #0E3D79 | 0.017 |
| Tritanopia (no blue cones) | #005058 | 0.080 |
| Achromatopsia (no color) | #424242 | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #03437A
#03437A
oklch(38% 0.11 251.6)
- #5D3A00
#5D3A00
oklch(38.1% 0.082 71.7)
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 #03437A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.003
- Marine Blue #01386A ΔE 0.041
- Cobalt #1E488F ΔE 0.042
- Light Navy #155084 ΔE 0.043
- Deep Sea Blue #015482 ΔE 0.052
- Dark Grey Blue #29465B ΔE 0.061
- Dusk Blue #26538D ΔE 0.062
- Prussian Blue #1D3557 ΔE 0.067
Use #03437A 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.