#1B78BA
Closest named color: Nice Blue (#107AB0). oklch(55.4% 0.131 245.8), rgb(27, 120, 186).
Aa
White text reads best on this color (4.72:1).
About this color
#1B78BA is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.131 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.019 away. White text reads best on it, at 4.72:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.131) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.44:1 |
| White text | 4.72:1 |
Values
| HEX | #1B78BA |
| RGB | rgb(27, 120, 186) |
| HSL | hsl(205, 75%, 42%) |
| OKLCH | oklch(55.4% 0.131 245.8) |
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 #1B78BA | 4.72:1 | AA | Lc -77.8 | Fine for body text |
| Black text on #1B78BA | 4.44:1 | AA large text | Lc 31.7 | Non-text elements, placeholder text |
| #1B78BA text on white | 4.72:1 | AA | Lc 72.4 | Content text, not long reading |
| #1B78BA text on black | 4.44:1 | AA large text | Lc -29.3 | 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
#E1EBF5
oklch(93.5% 0.017 248)
-
Step 200
200
#C8DCEE
oklch(88.5% 0.033 245.3)
-
Step 300
300
#A2C5E5
oklch(80.9% 0.059 246.2)
-
Step 400
400
#6DA7D8
oklch(70.8% 0.094 245.2)
-
Step 500
500
#438FCE
oklch(63% 0.121 246.4)
-
Step 600
600 (this color)
#1B78BA
oklch(55.4% 0.131 245.8)
-
Step 700
700
#0A65A1
oklch(49.1% 0.122 245.9)
-
Step 800
800
#105382
oklch(42.8% 0.1 245.4)
-
Step 900
900
#174568
oklch(37.7% 0.078 245.2)
-
Step 950
950
#0F283D
oklch(26.8% 0.05 246.5)
#1B78BA 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) | #597BBD | 0.053 |
| Deuteranopia (no green cones) | #426DB9 | 0.037 |
| Tritanopia (no blue cones) | #008890 | 0.092 |
| Achromatopsia (no color) | #737373 | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B78BA
#1B78BA
oklch(55.4% 0.131 245.8)
- #A36100
#A36100
oklch(55.4% 0.124 65.4)
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 #1B78BA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.019
- Windows Blue #3778BF ΔE 0.019
- Flat Blue #3C73A8 ΔE 0.032
- Mid Blue #276AB3 ΔE 0.039
- French Blue #436BAD ΔE 0.042
- Muted Blue #3B719F ΔE 0.044
- Water Blue #0E87CC ΔE 0.046
- Steel Blue #4682B4 ΔE 0.046
Use #1B78BA 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.