#05538F
Closest named color: Dusk Blue (#26538D). oklch(43.4% 0.119 249.7), rgb(5, 83, 143).
Aa
White text reads best on this color (7.95:1).
About this color
#05538F is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.119 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.018 away. White text reads best on it, at 7.95:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.64:1 |
| White text | 7.95:1 |
Values
| HEX | #05538F |
| RGB | rgb(5, 83, 143) |
| HSL | hsl(206, 93%, 29%) |
| OKLCH | oklch(43.4% 0.119 249.7) |
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 #05538F | 7.95:1 | AAA | Lc -91.7 | Preferred for body text |
| Black text on #05538F | 2.64:1 | Fails | Lc 17.0 | Dividers and decoration only |
| #05538F text on white | 7.95:1 | AAA | Lc 87.0 | Fine for body text |
| #05538F text on black | 2.64:1 | Fails | Lc -15.1 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF7
oklch(93.5% 0.02 250.4)
-
Step 200
200
#C6DCF2
oklch(88.5% 0.038 248.3)
-
Step 300
300
#9FC5EC
oklch(80.9% 0.069 249.4)
-
Step 400
400
#68A6E3
oklch(70.8% 0.111 249.3)
-
Step 500
500
#398EDB
oklch(63.2% 0.142 249.3)
-
Step 600
600
#0476C9
oklch(55.6% 0.155 249.7)
-
Step 700
700
#0063AB
oklch(49.2% 0.138 249.7)
-
Step 800
800 (this color)
#05538F
oklch(43.4% 0.119 249.7)
-
Step 900
900
#114470
oklch(37.8% 0.092 249.2)
-
Step 950
950
#0C2842
oklch(27.1% 0.059 249.5)
#05538F 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) | #355791 | 0.037 |
| Deuteranopia (no green cones) | #1D4C8E | 0.021 |
| Tritanopia (no blue cones) | #00626A | 0.087 |
| Achromatopsia (no color) | #515151 | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #05538F
#05538F
oklch(43.4% 0.119 249.7)
- #724600
#724600
oklch(43.5% 0.095 69.4)
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 #05538F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.018
- Light Navy #155084 ΔE 0.019
- Deep Sea Blue #015482 ΔE 0.023
- Cobalt #1E488F ΔE 0.032
- Light Navy Blue #2E5A88 ΔE 0.038
- Denim Blue #3B5B92 ΔE 0.049
- Twilight Blue #0A437A ΔE 0.055
- Peacock Blue #016795 ΔE 0.059
Use #05538F 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.