#3566CD
Closest named color: Royal Blue (#4169E1). oklch(53.4% 0.169 262.9), rgb(53, 102, 205).
Aa
White text reads best on this color (5.33:1).
About this color
#3566CD is a medium-dark, vivid blue. In OKLCH its lightness is 53%, its chroma 0.169 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.034 away. White text reads best on it, at 5.33:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.169) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 3.93:1 |
| White text | 5.33:1 |
Values
| HEX | #3566CD |
| RGB | rgb(53, 102, 205) |
| HSL | hsl(221, 60%, 51%) |
| OKLCH | oklch(53.4% 0.169 262.9) |
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 #3566CD | 5.33:1 | AA | Lc -81.5 | Fine for body text |
| Black text on #3566CD | 3.93:1 | AA large text | Lc 27.9 | Dividers and decoration only |
| #3566CD text on white | 5.33:1 | AA | Lc 76.1 | Fine for body text |
| #3566CD text on black | 3.93:1 | AA large text | Lc -25.6 | 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
#E2EAF9
oklch(93.5% 0.022 263.2)
-
Step 200
200
#CBDAF6
oklch(88.6% 0.042 263)
-
Step 300
300
#A7C1F2
oklch(80.9% 0.075 262.9)
-
Step 400
400
#789FEC
oklch(70.6% 0.121 263.1)
-
Step 500
500
#5585E6
oklch(63% 0.155 262.9)
-
Step 600
600 (this color)
#3566CD
oklch(53.4% 0.169 262.9)
-
Step 700
700
#2E5AB8
oklch(49.1% 0.157 263)
-
Step 800
800
#264A95
oklch(42.6% 0.13 262.8)
-
Step 900
900
#233F77
oklch(37.7% 0.102 262.6)
-
Step 950
950
#152545
oklch(26.9% 0.064 262.8)
#3566CD 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) | #2772D1 | 0.031 |
| Deuteranopia (no green cones) | #0064CB | 0.028 |
| Tritanopia (no blue cones) | #007F90 | 0.134 |
| Achromatopsia (no color) | #6B6B6B | 0.169 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3566CD
#3566CD
oklch(53.4% 0.169 262.9)
- #8C6600
#8C6600
oklch(53.5% 0.11 82.9)
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 #3566CD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.034
- Mid Blue #276AB3 ΔE 0.045
- Warm Blue #4B57DB ΔE 0.046
- Cerulean Blue #056EEE ΔE 0.054
- Neon Blue #4361EE ΔE 0.054
- French Blue #436BAD ΔE 0.055
- Azul #1D5DEC ΔE 0.056
- Windows Blue #3778BF ΔE 0.057
Use #3566CD 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.