#03537F
Closest named color: Deep Sea Blue (#015482). oklch(42.4% 0.099 242), rgb(3, 83, 127).
Aa
White text reads best on this color (8.24:1).
About this color
#03537F is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.099 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.005 away. White text reads best on it, at 8.24:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.54:1 |
| White text | 8.24:1 |
Values
| HEX | #03537F |
| RGB | rgb(3, 83, 127) |
| HSL | hsl(201, 95%, 25%) |
| OKLCH | oklch(42.4% 0.099 242) |
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 #03537F | 8.24:1 | AAA | Lc -92.6 | Preferred for body text |
| Black text on #03537F | 2.54:1 | Fails | Lc 16.0 | Dividers and decoration only |
| #03537F text on white | 8.24:1 | AAA | Lc 88.0 | Fine for body text |
| #03537F text on black | 2.54:1 | Fails | Lc -14.2 | 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 800.
-
Step 50
50
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1ECF4
oklch(93.7% 0.016 239.1)
-
Step 200
200
#C7DCED
oklch(88.4% 0.033 242.4)
-
Step 300
300
#A0C6E3
oklch(80.9% 0.058 241.3)
-
Step 400
400
#6AA8D6
oklch(70.8% 0.093 241.9)
-
Step 500
500
#3D91CB
oklch(63.1% 0.119 242.3)
-
Step 600
600
#0C7AB7
oklch(55.5% 0.128 242)
-
Step 700
700
#00679C
oklch(49.2% 0.116 241.5)
-
Step 800
800 (this color)
#03537F
oklch(42.4% 0.099 242)
-
Step 900
900
#134667
oklch(37.8% 0.077 241.9)
-
Step 950
950
#0D293C
oklch(27% 0.049 241.5)
#03537F 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) | #3E5481 | 0.046 |
| Deuteranopia (no green cones) | #2D4A7E | 0.034 |
| Tritanopia (no blue cones) | #005E63 | 0.066 |
| Achromatopsia (no color) | #4F4F4F | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #03537F
#03537F
oklch(42.4% 0.099 242)
- #734000
#734000
oklch(42.5% 0.097 62.4)
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 #03537F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.005
- Light Navy #155084 ΔE 0.015
- Dusk Blue #26538D ΔE 0.032
- Light Navy Blue #2E5A88 ΔE 0.039
- Cobalt #1E488F ΔE 0.046
- Twilight Blue #0A437A ΔE 0.048
- YInMn Blue #415A77 ΔE 0.058
- Petrol #005F6A ΔE 0.059
Use #03537F 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.