#104D9A
Closest named color: Cobalt (#1E488F). oklch(43% 0.139 257.1), rgb(16, 77, 154).
Aa
White text reads best on this color (8.23:1).
About this color
#104D9A is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.139 and its hue 257°. 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 8.23:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.55:1 |
| White text | 8.23:1 |
Values
| HEX | #104D9A |
| RGB | rgb(16, 77, 154) |
| HSL | hsl(213, 81%, 33%) |
| OKLCH | oklch(43% 0.139 257.1) |
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 #104D9A | 8.23:1 | AAA | Lc -92.6 | Preferred for body text |
| Black text on #104D9A | 2.55:1 | Fails | Lc 16.1 | Dividers and decoration only |
| #104D9A text on white | 8.23:1 | AAA | Lc 87.9 | Fine for body text |
| #104D9A text on black | 2.55:1 | Fails | Lc -14.3 | 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
#9FC3F5
oklch(80.9% 0.081 256.7)
-
Step 400
400
#6AA2F1
oklch(70.7% 0.131 257.1)
-
Step 500
500
#4088EC
oklch(63.1% 0.167 257.3)
-
Step 600
600
#1B6FDA
oklch(55.5% 0.181 257.2)
-
Step 700
700
#0A5CBD
oklch(49% 0.169 257.2)
-
Step 800
800 (this color)
#104D9A
oklch(43% 0.139 257.1)
-
Step 900
900
#15407A
oklch(37.6% 0.109 257.2)
-
Step 950
950
#0E2647
oklch(27% 0.068 257.1)
#104D9A 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) | #1E559D | 0.026 |
| Deuteranopia (no green cones) | #004998 | 0.014 |
| Tritanopia (no blue cones) | #00606C | 0.106 |
| Achromatopsia (no color) | #4F4F4F | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #104D9A
#104D9A
oklch(43% 0.139 257.1)
- #6B4800
#6B4800
oklch(43% 0.09 77)
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 #104D9A, 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 0.034
- Light Navy #155084 ΔE 0.039
- Deep Sea Blue #015482 ΔE 0.048
- Light Navy Blue #2E5A88 ΔE 0.058
- Sapphire #2138AB ΔE 0.059
- Blueberry #464196 ΔE 0.059
- Twilight Blue #0A437A ΔE 0.059
Use #104D9A 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.