#104A8C
Closest named color: Cobalt (#1E488F). oklch(41.2% 0.124 255.3), rgb(16, 74, 140).
Aa
White text reads best on this color (8.82:1).
About this color
#104A8C is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.124 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.011 away. White text reads best on it, at 8.82:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.38:1 |
| White text | 8.82:1 |
Values
| HEX | #104A8C |
| RGB | rgb(16, 74, 140) |
| HSL | hsl(212, 79%, 31%) |
| OKLCH | oklch(41.2% 0.124 255.3) |
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 #104A8C | 8.82:1 | AAA | Lc -94.2 | Preferred for body text |
| Black text on #104A8C | 2.38:1 | Fails | Lc 14.3 | Not readable |
| #104A8C text on white | 8.82:1 | AAA | Lc 89.7 | Fine for body text |
| #104A8C text on black | 2.38:1 | Fails | Lc -12.6 | 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
#C8DBF4
oklch(88.5% 0.04 255.3)
-
Step 300
300
#A2C3EF
oklch(80.8% 0.072 255.7)
-
Step 400
400
#6EA3E8
oklch(70.7% 0.116 255.5)
-
Step 500
500
#458AE1
oklch(63% 0.149 255.4)
-
Step 600
600
#2372CE
oklch(55.5% 0.161 255.2)
-
Step 700
700
#155FB3
oklch(49.1% 0.15 255.5)
-
Step 800
800 (this color)
#104A8C
oklch(41.2% 0.124 255.3)
-
Step 900
900
#194273
oklch(37.8% 0.096 254.8)
-
Step 950
950
#102744
oklch(27.1% 0.062 255.3)
#104A8C 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) | #26508E | 0.026 |
| Deuteranopia (no green cones) | #03458B | 0.017 |
| Tritanopia (no blue cones) | #005A64 | 0.093 |
| Achromatopsia (no color) | #4A4A4A | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #104A8C
#104A8C
oklch(41.2% 0.124 255.3)
- #664300
#664300
oklch(41.3% 0.087 75.3)
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 #104A8C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.011
- Light Navy #155084 ΔE 0.024
- Dusk Blue #26538D ΔE 0.033
- Twilight Blue #0A437A ΔE 0.035
- Deep Sea Blue #015482 ΔE 0.036
- Light Navy Blue #2E5A88 ΔE 0.058
- Blueberry #464196 ΔE 0.062
- Dark Slate Blue #483D8B ΔE 0.066
Use #104A8C 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.