#0A4789
Closest named color: Cobalt (#1E488F). oklch(40.2% 0.124 255.1), rgb(10, 71, 137).
Aa
White text reads best on this color (9.22:1).
About this color
#0A4789 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.124 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.017 away. White text reads best on it, at 9.22:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.27:1 |
| White text | 9.22:1 |
Values
| HEX | #0A4789 |
| RGB | rgb(10, 71, 137) |
| HSL | hsl(211, 86%, 29%) |
| OKLCH | oklch(40.2% 0.124 255.1) |
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 #0A4789 | 9.22:1 | AAA | Lc -95.1 | Preferred for body text |
| Black text on #0A4789 | 2.27:1 | Fails | Lc 13.2 | Not readable |
| #0A4789 text on white | 9.22:1 | AAA | Lc 90.7 | Preferred for body text |
| #0A4789 text on black | 2.27:1 | Fails | Lc -11.6 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DEEBFC
oklch(93.5% 0.027 255.1)
-
Step 200
200
#C3DBFC
oklch(88.4% 0.052 256.4)
-
Step 300
300
#98C4FC
oklch(80.9% 0.093 254.7)
-
Step 400
400
#5CA2FB
oklch(70.6% 0.149 255.3)
-
Step 500
500
#2288F9
oklch(63.2% 0.191 255)
-
Step 600
600
#0071DB
oklch(55.7% 0.183 255)
-
Step 700
700
#005EB9
oklch(49% 0.162 255.1)
-
Step 800
800
#004D99
oklch(42.7% 0.14 255)
-
Step 900
900 (this color)
#0A4789
oklch(40.2% 0.124 255.1)
-
Step 950
950
#06264C
oklch(27% 0.079 255.4)
#0A4789 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) | #214D8B | 0.025 |
| Deuteranopia (no green cones) | #004288 | 0.016 |
| Tritanopia (no blue cones) | #005761 | 0.093 |
| Achromatopsia (no color) | #474747 | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A4789
#0A4789
oklch(40.2% 0.124 255.1)
- #624000
#624000
oklch(40.1% 0.085 75)
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 #0A4789, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.017
- Twilight Blue #0A437A ΔE 0.027
- Light Navy #155084 ΔE 0.031
- Deep Sea Blue #015482 ΔE 0.042
- Dusk Blue #26538D ΔE 0.043
- Blueberry #464196 ΔE 0.066
- Light Navy Blue #2E5A88 ΔE 0.067
- Marine Blue #01386A ΔE 0.067
Use #0A4789 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.