#1A78C4
Closest named color: Windows Blue (#3778BF). oklch(56% 0.143 249), rgb(26, 120, 196).
Aa
White text reads best on this color (4.63:1).
About this color
#1A78C4 is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.143 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.018 away. White text reads best on it, at 4.63:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.52:1 |
| White text | 4.63:1 |
Values
| HEX | #1A78C4 |
| RGB | rgb(26, 120, 196) |
| HSL | hsl(207, 77%, 44%) |
| OKLCH | oklch(56% 0.143 249) |
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 #1A78C4 | 4.63:1 | AA | Lc -77.2 | Fine for body text |
| Black text on #1A78C4 | 4.52:1 | AA | Lc 32.4 | Non-text elements, placeholder text |
| #1A78C4 text on white | 4.63:1 | AA | Lc 71.7 | Content text, not long reading |
| #1A78C4 text on black | 4.52:1 | AA | Lc -30.0 | Dividers and decoration only |
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 600.
-
Step 50
50
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF6
oklch(93.6% 0.018 250.6)
-
Step 200
200
#C8DCF0
oklch(88.6% 0.035 248.2)
-
Step 300
300
#A1C5E9
oklch(81% 0.064 248.6)
-
Step 400
400
#6CA6DE
oklch(70.8% 0.103 248.6)
-
Step 500
500
#408ED5
oklch(63.1% 0.132 248.9)
-
Step 600
600 (this color)
#1A78C4
oklch(56% 0.143 249)
-
Step 700
700
#0563A8
oklch(49% 0.134 249.2)
-
Step 800
800
#0D5188
oklch(42.6% 0.111 249.2)
-
Step 900
900
#15446D
oklch(37.7% 0.086 248.8)
-
Step 950
950
#0E2840
oklch(27% 0.055 249)
#1A78C4 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) | #537DC7 | 0.048 |
| Deuteranopia (no green cones) | #386EC3 | 0.030 |
| Tritanopia (no blue cones) | #008A94 | 0.103 |
| Achromatopsia (no color) | #757575 | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1A78C4
#1A78C4
oklch(56% 0.143 249)
- #A26500
#A26500
oklch(56.1% 0.122 69)
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 #1A78C4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.018
- Nice Blue #107AB0 ΔE 0.034
- Water Blue #0E87CC ΔE 0.041
- Mid Blue #276AB3 ΔE 0.043
- Flat Blue #3C73A8 ΔE 0.045
- French Blue #436BAD ΔE 0.049
- Steel Blue #4682B4 ΔE 0.053
- Cool Blue #4984B8 ΔE 0.056
Use #1A78C4 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.