#0A4569
Closest named color: Twilight Blue (#0A437A). oklch(37.5% 0.083 242.3), rgb(10, 69, 105).
Aa
White text reads best on this color (10.15:1).
About this color
#0A4569 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.083 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.031 away. White text reads best on it, at 10.15:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.06:1 |
| White text | 10.15:1 |
Values
| HEX | #0A4569 |
| RGB | rgb(10, 69, 105) |
| HSL | hsl(203, 83%, 23%) |
| OKLCH | oklch(37.5% 0.083 242.3) |
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 #0A4569 | 10.15:1 | AAA | Lc -97.3 | Preferred for body text |
| Black text on #0A4569 | 2.06:1 | Fails | Lc 10.8 | Not readable |
| #0A4569 text on white | 10.15:1 | AAA | Lc 93.2 | Preferred for body text |
| #0A4569 text on black | 2.06:1 | Fails | Lc -9.3 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E0ECF5
oklch(93.7% 0.018 240)
-
Step 200
200
#C6DDEF
oklch(88.6% 0.035 241.5)
-
Step 300
300
#9EC6E6
oklch(80.9% 0.062 242.7)
-
Step 400
400
#65A8DA
oklch(70.7% 0.1 242.3)
-
Step 500
500
#3391D0
oklch(63.1% 0.128 242.5)
-
Step 600
600
#007ABA
oklch(55.6% 0.133 242.5)
-
Step 700
700
#00679D
oklch(49.2% 0.117 242)
-
Step 800
800
#005482
oklch(42.8% 0.102 242.4)
-
Step 900
900 (this color)
#0A4569
oklch(37.5% 0.083 242.3)
-
Step 950
950
#0A293E
oklch(27% 0.053 242.3)
#0A4569 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) | #34466B | 0.039 |
| Deuteranopia (no green cones) | #273E68 | 0.029 |
| Tritanopia (no blue cones) | #004E52 | 0.056 |
| Achromatopsia (no color) | #414141 | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A4569
#0A4569
oklch(37.5% 0.083 242.3)
- #5F3504
#5F3504
oklch(37.4% 0.083 62.4)
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 #0A4569, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.031
- Dark Grey Blue #29465B ΔE 0.034
- Marine Blue #01386A ΔE 0.043
- Charcoal #264653 ΔE 0.043
- Dark Blue Grey #1F3B4D ΔE 0.052
- Prussian Blue #1D3557 ΔE 0.053
- Light Navy #155084 ΔE 0.054
- Midnight Green #073B4C ΔE 0.055
Use #0A4569 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.