#0B428F
Closest named color: Cobalt (#1E488F). oklch(39.5% 0.139 258.7), rgb(11, 66, 143).
Aa
White text reads best on this color (9.58:1).
About this color
#0B428F is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.139 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.023 away. White text reads best on it, at 9.58:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.19:1 |
| White text | 9.58:1 |
Values
| HEX | #0B428F |
| RGB | rgb(11, 66, 143) |
| HSL | hsl(215, 86%, 30%) |
| OKLCH | oklch(39.5% 0.139 258.7) |
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 #0B428F | 9.58:1 | AAA | Lc -95.9 | Preferred for body text |
| Black text on #0B428F | 2.19:1 | Fails | Lc 12.4 | Not readable |
| #0B428F text on white | 9.58:1 | AAA | Lc 91.6 | Preferred for body text |
| #0B428F text on black | 2.19:1 | Fails | Lc -10.8 | 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
#F0F6FF
oklch(97.1% 0.014 258.3)
-
Step 100
100
#DEEBFF
oklch(93.6% 0.031 258.9)
-
Step 200
200
#C3DBFF
oklch(88.5% 0.056 258.4)
-
Step 300
300
#9BC2FF
oklch(80.8% 0.097 259.2)
-
Step 400
400
#62A0FF
oklch(70.7% 0.154 258.7)
-
Step 500
500
#3184FF
oklch(63% 0.2 258.7)
-
Step 600
600
#006AEC
oklch(55.5% 0.213 258.8)
-
Step 700
700
#0059C8
oklch(49.1% 0.188 258.7)
-
Step 800
800
#0049A6
oklch(42.8% 0.163 258.6)
-
Step 900
900 (this color)
#0B428F
oklch(39.5% 0.139 258.7)
-
Step 950
950
#072450
oklch(26.9% 0.088 259)
#0B428F 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) | #054B92 | 0.025 |
| Deuteranopia (no green cones) | #00408E | 0.008 |
| Tritanopia (no blue cones) | #005562 | 0.105 |
| Achromatopsia (no color) | #454545 | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0B428F
#0B428F
oklch(39.5% 0.139 258.7)
- #5E4000
#5E4000
oklch(39.5% 0.082 78.6)
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 #0B428F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.023
- Twilight Blue #0A437A ΔE 0.036
- Light Navy #155084 ΔE 0.048
- Sapphire #2138AB ΔE 0.053
- Dusk Blue #26538D ΔE 0.056
- Deep Sea Blue #015482 ΔE 0.059
- Blueberry #464196 ΔE 0.064
- Dark Slate Blue #483D8B ΔE 0.067
Use #0B428F 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.