#104D9E
Closest named color: Cobalt (#1E488F). oklch(43.3% 0.145 257.8), rgb(16, 77, 158).
Aa
White text reads best on this color (8.14:1).
About this color
#104D9E is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.145 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.027 away. White text reads best on it, at 8.14:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.57:1 |
| White text | 8.14:1 |
Values
| HEX | #104D9E |
| RGB | rgb(16, 77, 158) |
| HSL | hsl(214, 82%, 34%) |
| OKLCH | oklch(43.3% 0.145 257.8) |
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 #104D9E | 8.14:1 | AAA | Lc -92.3 | Preferred for body text |
| Black text on #104D9E | 2.57:1 | Fails | Lc 16.4 | Dividers and decoration only |
| #104D9E text on white | 8.14:1 | AAA | Lc 87.6 | Fine for body text |
| #104D9E text on black | 2.57:1 | Fails | Lc -14.5 | 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
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C6DBF9
oklch(88.5% 0.047 257.3)
-
Step 300
300
#9FC3F7
oklch(81% 0.084 257.5)
-
Step 400
400
#69A1F4
oklch(70.6% 0.136 258.1)
-
Step 500
500
#3E87F0
oklch(63.1% 0.174 257.9)
-
Step 600
600
#196EDE
oklch(55.6% 0.188 257.9)
-
Step 700
700
#085BC1
oklch(49% 0.175 257.9)
-
Step 800
800 (this color)
#104D9E
oklch(43.3% 0.145 257.8)
-
Step 900
900
#15407C
oklch(37.8% 0.112 257.7)
-
Step 950
950
#0E2649
oklch(27.1% 0.072 258)
#104D9E 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) | #1856A1 | 0.026 |
| Deuteranopia (no green cones) | #004A9C | 0.012 |
| Tritanopia (no blue cones) | #00616E | 0.110 |
| Achromatopsia (no color) | #4F4F4F | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #104D9E
#104D9E
oklch(43.3% 0.145 257.8)
- #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 #104D9E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.027
- Dusk Blue #26538D ΔE 0.038
- Light Navy #155084 ΔE 0.045
- Deep Sea Blue #015482 ΔE 0.054
- Sapphire #2138AB ΔE 0.055
- Blueberry #464196 ΔE 0.059
- Light Navy Blue #2E5A88 ΔE 0.062
- Denim Blue #3B5B92 ΔE 0.063
Use #104D9E 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.