#3B78DA
Closest named color: Royal Blue (#4169E1). oklch(58.3% 0.163 259.5), rgb(59, 120, 218).
Aa
Black text reads best on this color (4.88:1).
About this color
#3B78DA is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.163 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.040 away. Black text reads best on it, at 4.88:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.163) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.88:1 |
| White text | 4.29:1 |
Values
| HEX | #3B78DA |
| RGB | rgb(59, 120, 218) |
| HSL | hsl(217, 68%, 54%) |
| OKLCH | oklch(58.3% 0.163 259.5) |
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 #3B78DA | 4.29:1 | AA large text | Lc -74.9 | Content text, not long reading |
| Black text on #3B78DA | 4.88:1 | AA | Lc 34.7 | Non-text elements, placeholder text |
| #3B78DA text on white | 4.29:1 | AA large text | Lc 69.4 | Content text, not long reading |
| #3B78DA text on black | 4.88:1 | AA | Lc -32.3 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EAF8
oklch(93.5% 0.021 261.8)
-
Step 200
200
#CADAF5
oklch(88.5% 0.041 260.9)
-
Step 300
300
#A5C2F1
oklch(80.9% 0.074 260)
-
Step 400
400
#74A1E9
oklch(70.6% 0.117 259.5)
-
Step 500
500
#4F88E3
oklch(63.1% 0.15 259.4)
-
Step 600
600 (this color)
#3B78DA
oklch(58.3% 0.163 259.5)
-
Step 700
700
#255DB5
oklch(49.2% 0.152 259.4)
-
Step 800
800
#204C92
oklch(42.6% 0.125 259.4)
-
Step 900
900
#204075
oklch(37.7% 0.098 259.9)
-
Step 950
950
#132644
oklch(27% 0.061 259.2)
#3B78DA 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) | #4682DE | 0.030 |
| Deuteranopia (no green cones) | #2473D8 | 0.023 |
| Tritanopia (no blue cones) | #008F9E | 0.128 |
| Achromatopsia (no color) | #7A7A7A | 0.163 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3B78DA
#3B78DA
oklch(58.3% 0.163 259.5)
- #A17100
#A17100
oklch(58.3% 0.121 79.1)
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 #3B78DA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.040
- Windows Blue #3778BF ΔE 0.042
- Cerulean Blue #056EEE ΔE 0.051
- Water Blue #0E87CC ΔE 0.052
- Clear Blue #247AFD ΔE 0.053
- Dark Sky Blue #448EE4 ΔE 0.061
- Neon Blue #4361EE ΔE 0.066
- Soft Blue #6488EA ΔE 0.067
Use #3B78DA 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.