#0A4E9D
Closest named color: Cobalt (#1E488F). oklch(43.4% 0.143 256.5), rgb(10, 78, 157).
Aa
White text reads best on this color (8.10:1).
About this color
#0A4E9D is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.143 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.027 away. White text reads best on it, at 8.10:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.58:1 |
| White text | 8.10:1 |
Values
| HEX | #0A4E9D |
| RGB | rgb(10, 78, 157) |
| HSL | hsl(212, 88%, 33%) |
| OKLCH | oklch(43.4% 0.143 256.5) |
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 #0A4E9D | 8.10:1 | AAA | Lc -92.1 | Preferred for body text |
| Black text on #0A4E9D | 2.58:1 | Fails | Lc 16.6 | Dividers and decoration only |
| #0A4E9D text on white | 8.10:1 | AAA | Lc 87.4 | Fine for body text |
| #0A4E9D text on black | 2.58:1 | Fails | Lc -14.7 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C6DBF8
oklch(88.5% 0.046 256.5)
-
Step 300
300
#9EC3F7
oklch(80.9% 0.084 256.9)
-
Step 400
400
#67A2F3
oklch(70.7% 0.135 256.6)
-
Step 500
500
#3B88EE
oklch(63% 0.171 256.7)
-
Step 600
600
#0F6FDD
oklch(55.6% 0.187 256.6)
-
Step 700
700
#005DBE
oklch(49.2% 0.17 256.3)
-
Step 800
800 (this color)
#0A4E9D
oklch(43.4% 0.143 256.5)
-
Step 900
900
#12407B
oklch(37.6% 0.112 256.7)
-
Step 950
950
#0C2648
oklch(26.9% 0.071 256.4)
#0A4E9D 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) | #1C56A0 | 0.026 |
| Deuteranopia (no green cones) | #004A9B | 0.013 |
| Tritanopia (no blue cones) | #00616E | 0.107 |
| Achromatopsia (no color) | #505050 | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A4E9D
#0A4E9D
oklch(43.4% 0.143 256.5)
- #6D4900
#6D4900
oklch(43.5% 0.091 76.5)
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 #0A4E9D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.027
- Dusk Blue #26538D ΔE 0.036
- Light Navy #155084 ΔE 0.043
- Deep Sea Blue #015482 ΔE 0.051
- Sapphire #2138AB ΔE 0.058
- Light Navy Blue #2E5A88 ΔE 0.060
- Denim Blue #3B5B92 ΔE 0.061
- Blueberry #464196 ΔE 0.061
Use #0A4E9D 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.