#2778C4
Closest named color: Windows Blue (#3778BF). oklch(56.3% 0.14 250.8), rgb(39, 120, 196).
Aa
White text reads best on this color (4.59:1).
About this color
#2778C4 is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.140 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.013 away. White text reads best on it, at 4.59:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.140) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.56:1 |
| White text | 4.59:1 |
Values
| HEX | #2778C4 |
| RGB | rgb(39, 120, 196) |
| HSL | hsl(209, 67%, 46%) |
| OKLCH | oklch(56.3% 0.14 250.8) |
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 #2778C4 | 4.59:1 | AA | Lc -77.0 | Fine for body text |
| Black text on #2778C4 | 4.56:1 | AA | Lc 32.6 | Non-text elements, placeholder text |
| #2778C4 text on white | 4.59:1 | AA | Lc 71.5 | Content text, not long reading |
| #2778C4 text on black | 4.56:1 | AA | Lc -30.2 | Non-text elements, placeholder text |
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
#C9DBF0
oklch(88.4% 0.035 252.3)
-
Step 300
300
#A3C4E9
oklch(80.9% 0.064 251.5)
-
Step 400
400
#70A5DE
oklch(70.8% 0.101 251.1)
-
Step 500
500
#478DD4
oklch(63% 0.129 250.9)
-
Step 600
600 (this color)
#2778C4
oklch(56.3% 0.14 250.8)
-
Step 700
700
#1663A7
oklch(49.2% 0.13 250.6)
-
Step 800
800
#165187
oklch(42.7% 0.107 250.5)
-
Step 900
900
#1A436C
oklch(37.6% 0.084 251.1)
-
Step 950
950
#10283F
oklch(27% 0.053 249.5)
#2778C4 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) | #547DC7 | 0.043 |
| Deuteranopia (no green cones) | #3B6FC3 | 0.026 |
| Tritanopia (no blue cones) | #008A94 | 0.104 |
| Achromatopsia (no color) | #757575 | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2778C4
#2778C4
oklch(56.3% 0.14 250.8)
- #A16700
#A16700
oklch(56.3% 0.121 71.1)
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 #2778C4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.013
- Nice Blue #107AB0 ΔE 0.035
- Water Blue #0E87CC ΔE 0.041
- Flat Blue #3C73A8 ΔE 0.044
- Mid Blue #276AB3 ΔE 0.044
- French Blue #436BAD ΔE 0.047
- Steel Blue #4682B4 ΔE 0.049
- Cool Blue #4984B8 ΔE 0.052
Use #2778C4 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.