#3566D4
Closest named color: Royal Blue (#4169E1). oklch(53.9% 0.178 263.5), rgb(53, 102, 212).
Aa
White text reads best on this color (5.24:1).
About this color
#3566D4 is a medium-dark, vivid blue. In OKLCH its lightness is 54%, its chroma 0.178 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.025 away. White text reads best on it, at 5.24:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.178) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.00:1 |
| White text | 5.24:1 |
Values
| HEX | #3566D4 |
| RGB | rgb(53, 102, 212) |
| HSL | hsl(222, 65%, 52%) |
| OKLCH | oklch(53.9% 0.178 263.5) |
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 #3566D4 | 5.24:1 | AA | Lc -81.0 | Fine for body text |
| Black text on #3566D4 | 4.00:1 | AA large text | Lc 28.5 | Dividers and decoration only |
| #3566D4 text on white | 5.24:1 | AA | Lc 75.6 | Fine for body text |
| #3566D4 text on black | 4.00:1 | AA large text | Lc -26.1 | 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
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAFA
oklch(93.6% 0.023 264.5)
-
Step 200
200
#CADAF7
oklch(88.5% 0.044 262.4)
-
Step 300
300
#A6C1F5
oklch(80.9% 0.08 263.3)
-
Step 400
400
#779FF0
oklch(70.7% 0.127 263.5)
-
Step 500
500
#5484EB
oklch(63% 0.164 263.6)
-
Step 600
600 (this color)
#3566D4
oklch(53.9% 0.178 263.5)
-
Step 700
700
#2C59BD
oklch(49.1% 0.165 263.3)
-
Step 800
800
#254999
oklch(42.7% 0.138 263.5)
-
Step 900
900
#233E7A
oklch(37.7% 0.107 263.8)
-
Step 950
950
#152547
oklch(27.1% 0.067 263.6)
#3566D4 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) | #1A74D8 | 0.036 |
| Deuteranopia (no green cones) | #0065D2 | 0.027 |
| Tritanopia (no blue cones) | #008193 | 0.141 |
| Achromatopsia (no color) | #6C6C6C | 0.178 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3566D4
#3566D4
oklch(53.9% 0.178 263.5)
- #8D6700
#8D6700
oklch(53.8% 0.111 83.1)
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 #3566D4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.025
- Warm Blue #4B57DB ΔE 0.041
- Neon Blue #4361EE ΔE 0.044
- Cerulean Blue #056EEE ΔE 0.045
- Azul #1D5DEC ΔE 0.047
- Mid Blue #276AB3 ΔE 0.056
- Dark Periwinkle #665FD1 ΔE 0.058
- Iris #6258C4 ΔE 0.062
Use #3566D4 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.