#104E9B
Closest named color: Cobalt (#1E488F). oklch(43.3% 0.139 256.9), rgb(16, 78, 155).
Aa
White text reads best on this color (8.12:1).
About this color
#104E9B 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 0.024 away. White text reads best on it, at 8.12:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.58:1 |
| White text | 8.12:1 |
Values
| HEX | #104E9B |
| RGB | rgb(16, 78, 155) |
| HSL | hsl(213, 81%, 34%) |
| OKLCH | oklch(43.3% 0.139 256.9) |
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 #104E9B | 8.12:1 | AAA | Lc -92.2 | Preferred for body text |
| Black text on #104E9B | 2.58:1 | Fails | Lc 16.5 | Dividers and decoration only |
| #104E9B text on white | 8.12:1 | AAA | Lc 87.6 | Fine for body text |
| #104E9B text on black | 2.58:1 | Fails | Lc -14.6 | 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
#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
#3F88EC
oklch(63.1% 0.167 257.1)
-
Step 600
600
#1970DA
oklch(55.7% 0.18 256.7)
-
Step 700
700
#085DBD
oklch(49.2% 0.168 256.7)
-
Step 800
800 (this color)
#104E9B
oklch(43.3% 0.139 256.9)
-
Step 900
900
#15407A
oklch(37.6% 0.109 257.2)
-
Step 950
950
#0E2647
oklch(27% 0.068 257.1)
#104E9B 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) | #1F569E | 0.026 |
| Deuteranopia (no green cones) | #004A99 | 0.014 |
| Tritanopia (no blue cones) | #00616D | 0.106 |
| Achromatopsia (no color) | #505050 | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #104E9B
#104E9B
oklch(43.3% 0.139 256.9)
- #6C4900
#6C4900
oklch(43.3% 0.091 77.3)
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 #104E9B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.024
- Dusk Blue #26538D ΔE 0.033
- Light Navy #155084 ΔE 0.039
- Deep Sea Blue #015482 ΔE 0.048
- Light Navy Blue #2E5A88 ΔE 0.057
- Denim Blue #3B5B92 ΔE 0.059
- Blueberry #464196 ΔE 0.059
- Sapphire #2138AB ΔE 0.060
Use #104E9B 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.