#104C9B
Closest named color: Cobalt (#1E488F). oklch(42.8% 0.142 257.7), rgb(16, 76, 155).
Aa
White text reads best on this color (8.30:1).
About this color
#104C9B is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.142 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.022 away. White text reads best on it, at 8.30:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.142) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.52:1 |
| White text | 8.30:1 |
Values
| HEX | #104C9B |
| RGB | rgb(16, 76, 155) |
| HSL | hsl(214, 81%, 34%) |
| OKLCH | oklch(42.8% 0.142 257.7) |
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 #104C9B | 8.30:1 | AAA | Lc -92.7 | Preferred for body text |
| Black text on #104C9B | 2.52:1 | Fails | Lc 15.9 | Dividers and decoration only |
| #104C9B text on white | 8.30:1 | AAA | Lc 88.1 | Fine for body text |
| #104C9B text on black | 2.52:1 | Fails | Lc -14.1 | 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
#C7DBF8
oklch(88.6% 0.046 257.6)
-
Step 300
300
#9FC3F6
oklch(80.9% 0.082 257.1)
-
Step 400
400
#6AA2F2
oklch(70.8% 0.132 257.4)
-
Step 500
500
#4088EE
oklch(63.2% 0.17 257.6)
-
Step 600
600
#1B6FDC
oklch(55.7% 0.184 257.5)
-
Step 700
700
#0C5CBF
oklch(49.2% 0.171 257.6)
-
Step 800
800 (this color)
#104C9B
oklch(42.8% 0.142 257.7)
-
Step 900
900
#16407B
oklch(37.7% 0.111 257.8)
-
Step 950
950
#0E2648
oklch(27% 0.07 257.6)
#104C9B 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) | #19559E | 0.027 |
| Deuteranopia (no green cones) | #004899 | 0.014 |
| Tritanopia (no blue cones) | #005F6C | 0.107 |
| Achromatopsia (no color) | #4E4E4E | 0.142 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #104C9B
#104C9B
oklch(42.8% 0.142 257.7)
- #6A4800
#6A4800
oklch(42.9% 0.089 77.8)
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 #104C9B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.022
- Dusk Blue #26538D ΔE 0.037
- Light Navy #155084 ΔE 0.041
- Deep Sea Blue #015482 ΔE 0.051
- Sapphire #2138AB ΔE 0.055
- Blueberry #464196 ΔE 0.058
- Twilight Blue #0A437A ΔE 0.059
- Light Navy Blue #2E5A88 ΔE 0.061
Use #104C9B 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.