#0B439E
Closest named color: Cobalt (#1E488F). oklch(41% 0.158 260.5), rgb(11, 67, 158).
Aa
White text reads best on this color (9.08:1).
About this color
#0B439E is a dark, vivid blue. In OKLCH its lightness is 41%, its chroma 0.158 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.032 away. White text reads best on it, at 9.08:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | vivid (0.158) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.31:1 |
| White text | 9.08:1 |
Values
| HEX | #0B439E |
| RGB | rgb(11, 67, 158) |
| HSL | hsl(217, 87%, 33%) |
| OKLCH | oklch(41% 0.158 260.5) |
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 #0B439E | 9.08:1 | AAA | Lc -94.6 | Preferred for body text |
| Black text on #0B439E | 2.31:1 | Fails | Lc 13.8 | Not readable |
| #0B439E text on white | 9.08:1 | AAA | Lc 90.2 | Preferred for body text |
| #0B439E text on black | 2.31:1 | Fails | Lc -12.1 | 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
#C6DAFC
oklch(88.4% 0.052 261.1)
-
Step 300
300
#9EC2FD
oklch(80.9% 0.093 260.1)
-
Step 400
400
#699FFC
oklch(70.6% 0.148 260.7)
-
Step 500
500
#4084F9
oklch(63.1% 0.188 260.5)
-
Step 600
600
#1E6AE9
oklch(55.7% 0.206 260.5)
-
Step 700
700
#1057CA
oklch(49% 0.191 260.5)
-
Step 800
800 (this color)
#0B439E
oklch(41% 0.158 260.5)
-
Step 900
900
#163E82
oklch(37.8% 0.123 260.4)
-
Step 950
950
#0E254C
oklch(27.1% 0.078 260.3)
#0B439E 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) | #004FA1 | 0.031 |
| Deuteranopia (no green cones) | #00429C | 0.007 |
| Tritanopia (no blue cones) | #005A6A | 0.119 |
| Achromatopsia (no color) | #484848 | 0.158 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0B439E
#0B439E
oklch(41% 0.158 260.5)
- #624400
#624400
oklch(40.9% 0.085 80)
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 #0B439E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.032
- Sapphire #2138AB ΔE 0.034
- Light Navy #155084 ΔE 0.060
- Dusk Blue #26538D ΔE 0.060
- Twilight Blue #0A437A ΔE 0.060
- Blueberry #464196 ΔE 0.061
- Blue Blue #2242C7 ΔE 0.068
- Dark Slate Blue #483D8B ΔE 0.071
Use #0B439E 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.