#05439C
Closest named color: Cobalt (#1E488F). oklch(40.7% 0.156 259.5), rgb(5, 67, 156).
Aa
White text reads best on this color (9.17:1).
About this color
#05439C is a dark, vivid blue. In OKLCH its lightness is 41%, its chroma 0.156 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.030 away. White text reads best on it, at 9.17:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | vivid (0.156) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.28:1 |
| White text | 9.17:1 |
Values
| HEX | #05439C |
| RGB | rgb(5, 67, 156) |
| HSL | hsl(215, 94%, 32%) |
| OKLCH | oklch(40.7% 0.156 259.5) |
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 #05439C | 9.17:1 | AAA | Lc -94.8 | Preferred for body text |
| Black text on #05439C | 2.28:1 | Fails | Lc 13.6 | Not readable |
| #05439C text on white | 9.17:1 | AAA | Lc 90.4 | Preferred for body text |
| #05439C text on black | 2.28:1 | Fails | Lc -11.9 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EBFC
oklch(93.7% 0.026 259)
-
Step 200
200
#C6DBFB
oklch(88.6% 0.05 258.7)
-
Step 300
300
#9EC2FC
oklch(80.9% 0.091 259.8)
-
Step 400
400
#68A0FB
oklch(70.7% 0.146 259.7)
-
Step 500
500
#3D85F8
oklch(63.1% 0.187 259.5)
-
Step 600
600
#186BE7
oklch(55.6% 0.203 259.5)
-
Step 700
700
#0858C9
oklch(49.1% 0.189 259.6)
-
Step 800
800 (this color)
#05439C
oklch(40.7% 0.156 259.5)
-
Step 900
900
#143E81
oklch(37.7% 0.122 259.7)
-
Step 950
950
#0D254B
oklch(27% 0.077 259.3)
#05439C 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) | #004F9F | 0.032 |
| Deuteranopia (no green cones) | #00429A | 0.005 |
| Tritanopia (no blue cones) | #005A69 | 0.119 |
| Achromatopsia (no color) | #484848 | 0.156 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #05439C
#05439C
oklch(40.7% 0.156 259.5)
- #624300
#624300
oklch(40.7% 0.085 78.8)
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 #05439C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.030
- Sapphire #2138AB ΔE 0.037
- Twilight Blue #0A437A ΔE 0.057
- Light Navy #155084 ΔE 0.058
- Dusk Blue #26538D ΔE 0.060
- Blueberry #464196 ΔE 0.063
- Deep Sea Blue #015482 ΔE 0.069
- Dark Slate Blue #483D8B ΔE 0.072
Use #05439C 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.