#0A4D8E
Closest named color: Cobalt (#1E488F). oklch(42% 0.124 253.3), rgb(10, 77, 142).
Aa
White text reads best on this color (8.51:1).
About this color
#0A4D8E is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.124 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.016 away. White text reads best on it, at 8.51:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.46:1 |
| White text | 8.51:1 |
Values
| HEX | #0A4D8E |
| RGB | rgb(10, 77, 142) |
| HSL | hsl(210, 87%, 30%) |
| OKLCH | oklch(42% 0.124 253.3) |
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 #0A4D8E | 8.51:1 | AAA | Lc -93.4 | Preferred for body text |
| Black text on #0A4D8E | 2.46:1 | Fails | Lc 15.2 | Dividers and decoration only |
| #0A4D8E text on white | 8.51:1 | AAA | Lc 88.8 | Fine for body text |
| #0A4D8E text on black | 2.46:1 | Fails | Lc -13.4 | 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
#C7DBF4
oklch(88.4% 0.041 254)
-
Step 300
300
#A0C4EF
oklch(80.9% 0.072 253.1)
-
Step 400
400
#6BA4E7
oklch(70.7% 0.116 253.3)
-
Step 500
500
#408BE0
oklch(63% 0.148 253.6)
-
Step 600
600
#1973CE
oklch(55.5% 0.162 253.6)
-
Step 700
700
#0760B2
oklch(49% 0.15 253.5)
-
Step 800
800 (this color)
#0A4D8E
oklch(42% 0.124 253.3)
-
Step 900
900
#154273
oklch(37.6% 0.097 253.4)
-
Step 950
950
#0E2743
oklch(26.9% 0.061 253.2)
#0A4D8E 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) | #2A5390 | 0.030 |
| Deuteranopia (no green cones) | #0B478D | 0.017 |
| Tritanopia (no blue cones) | #005D66 | 0.093 |
| Achromatopsia (no color) | #4D4D4D | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A4D8E
#0A4D8E
oklch(42% 0.124 253.3)
- #6A4400
#6A4400
oklch(42% 0.089 73.2)
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 #0A4D8E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.016
- Light Navy #155084 ΔE 0.021
- Dusk Blue #26538D ΔE 0.027
- Deep Sea Blue #015482 ΔE 0.031
- Twilight Blue #0A437A ΔE 0.042
- Light Navy Blue #2E5A88 ΔE 0.052
- Denim Blue #3B5B92 ΔE 0.061
- Blueberry #464196 ΔE 0.065
Use #0A4D8E 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.