#0A4E8E
Closest named color: Cobalt (#1E488F). oklch(42.2% 0.123 252.8), rgb(10, 78, 142).
Aa
White text reads best on this color (8.42:1).
About this color
#0A4E8E is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.123 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.019 away. White text reads best on it, at 8.42:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.49:1 |
| White text | 8.42:1 |
Values
| HEX | #0A4E8E |
| RGB | rgb(10, 78, 142) |
| HSL | hsl(209, 87%, 30%) |
| OKLCH | oklch(42.2% 0.123 252.8) |
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 #0A4E8E | 8.42:1 | AAA | Lc -93.1 | Preferred for body text |
| Black text on #0A4E8E | 2.49:1 | Fails | Lc 15.5 | Dividers and decoration only |
| #0A4E8E text on white | 8.42:1 | AAA | Lc 88.5 | Fine for body text |
| #0A4E8E text on black | 2.49:1 | Fails | Lc -13.7 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF8
oklch(93.6% 0.021 252.5)
-
Step 200
200
#C7DBF3
oklch(88.4% 0.04 253)
-
Step 300
300
#A0C4EE
oklch(80.9% 0.071 252.6)
-
Step 400
400
#6BA4E6
oklch(70.7% 0.114 253)
-
Step 500
500
#3F8CDF
oklch(63.1% 0.146 252.6)
-
Step 600
600
#1774CD
oklch(55.6% 0.16 252.8)
-
Step 700
700
#0461B1
oklch(49.1% 0.148 252.6)
-
Step 800
800 (this color)
#0A4E8E
oklch(42.2% 0.123 252.8)
-
Step 900
900
#154272
oklch(37.5% 0.096 253)
-
Step 950
950
#0E2743
oklch(26.9% 0.061 253.2)
#0A4E8E 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) | #2C5390 | 0.030 |
| Deuteranopia (no green cones) | #10488D | 0.017 |
| Tritanopia (no blue cones) | #005D67 | 0.089 |
| Achromatopsia (no color) | #4D4D4D | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A4E8E
#0A4E8E
oklch(42.2% 0.123 252.8)
- #6B4400
#6B4400
oklch(42.1% 0.09 72.4)
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 #0A4E8E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.019
- Light Navy #155084 ΔE 0.019
- Dusk Blue #26538D ΔE 0.025
- Deep Sea Blue #015482 ΔE 0.029
- Twilight Blue #0A437A ΔE 0.044
- Light Navy Blue #2E5A88 ΔE 0.049
- Denim Blue #3B5B92 ΔE 0.059
- Blueberry #464196 ΔE 0.066
Use #0A4E8E 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.