#10478B
Closest named color: Cobalt (#1E488F). oklch(40.5% 0.126 256.5), rgb(16, 71, 139).
Aa
White text reads best on this color (9.14:1).
About this color
#10478B is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.126 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.013 away. White text reads best on it, at 9.14:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.126) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.29:1 |
| White text | 9.14:1 |
Values
| HEX | #10478B |
| RGB | rgb(16, 71, 139) |
| HSL | hsl(213, 79%, 30%) |
| OKLCH | oklch(40.5% 0.126 256.5) |
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 #10478B | 9.14:1 | AAA | Lc -95.0 | Preferred for body text |
| Black text on #10478B | 2.29:1 | Fails | Lc 13.4 | Not readable |
| #10478B text on white | 9.14:1 | AAA | Lc 90.5 | Preferred for body text |
| #10478B text on black | 2.29:1 | Fails | Lc -11.8 | 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
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C8DBF5
oklch(88.5% 0.041 256.2)
-
Step 300
300
#A2C3F0
oklch(80.9% 0.073 256.2)
-
Step 400
400
#6FA2E9
oklch(70.6% 0.118 256.8)
-
Step 500
500
#4789E2
oklch(63% 0.151 256.6)
-
Step 600
600
#2771D0
oklch(55.5% 0.163 256.6)
-
Step 700
700
#195EB5
oklch(49.1% 0.153 256.8)
-
Step 800
800 (this color)
#10478B
oklch(40.5% 0.126 256.5)
-
Step 900
900
#1A4174
oklch(37.6% 0.098 256.3)
-
Step 950
950
#112744
oklch(27.1% 0.061 256.1)
#10478B 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) | #204E8E | 0.025 |
| Deuteranopia (no green cones) | #00438A | 0.015 |
| Tritanopia (no blue cones) | #005762 | 0.094 |
| Achromatopsia (no color) | #484848 | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #10478B
#10478B
oklch(40.5% 0.126 256.5)
- #624200
#624200
oklch(40.5% 0.085 77.5)
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 #10478B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.013
- Twilight Blue #0A437A ΔE 0.030
- Light Navy #155084 ΔE 0.031
- Dusk Blue #26538D ΔE 0.041
- Deep Sea Blue #015482 ΔE 0.043
- Blueberry #464196 ΔE 0.062
- Dark Slate Blue #483D8B ΔE 0.065
- Sapphire #2138AB ΔE 0.065
Use #10478B 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.