#566AD8
Closest named color: Royal Blue (#4169E1). oklch(56.6% 0.169 272.2), rgb(86, 106, 216).
Aa
White text reads best on this color (4.72:1).
About this color
#566AD8 is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.169 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.027 away. White text reads best on it, at 4.72:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.169) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.44:1 |
| White text | 4.72:1 |
Values
| HEX | #566AD8 |
| RGB | rgb(86, 106, 216) |
| HSL | hsl(231, 63%, 59%) |
| OKLCH | oklch(56.6% 0.169 272.2) |
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 #566AD8 | 4.72:1 | AA | Lc -77.9 | Fine for body text |
| Black text on #566AD8 | 4.44:1 | AA large text | Lc 31.6 | Non-text elements, placeholder text |
| #566AD8 text on white | 4.72:1 | AA | Lc 72.5 | Content text, not long reading |
| #566AD8 text on black | 4.44:1 | AA large text | Lc -29.2 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E4E9F9
oklch(93.5% 0.022 272.1)
-
Step 200
200
#CFD8F6
oklch(88.5% 0.042 272.3)
-
Step 300
300
#AFBEF3
oklch(80.9% 0.077 272.3)
-
Step 400
400
#869BEC
oklch(70.7% 0.121 271.9)
-
Step 500
500
#6A80E6
oklch(63.1% 0.155 272.1)
-
Step 600
600 (this color)
#566AD8
oklch(56.6% 0.169 272.2)
-
Step 700
700
#4455B8
oklch(49.1% 0.157 272)
-
Step 800
800
#384695
oklch(42.7% 0.13 272.2)
-
Step 900
900
#303C77
oklch(37.8% 0.101 272.1)
-
Step 950
950
#1C2345
oklch(26.9% 0.064 272.7)
#566AD8 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) | #2C79DC | 0.048 |
| Deuteranopia (no green cones) | #066ED6 | 0.055 |
| Tritanopia (no blue cones) | #008397 | 0.145 |
| Achromatopsia (no color) | #737373 | 0.169 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #566AD8
#566AD8
oklch(56.6% 0.169 272.2)
- #8F7300
#8F7300
oklch(56.6% 0.116 91.8)
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 #566AD8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.027
- Dark Periwinkle #665FD1 ΔE 0.033
- Slate Blue #6A5ACD ΔE 0.046
- Light Indigo #6D5ACF ΔE 0.047
- Neon Blue #4361EE ΔE 0.048
- Warm Blue #4B57DB ΔE 0.050
- Iris #6258C4 ΔE 0.051
- Cerulean Blue #056EEE ΔE 0.061
Use #566AD8 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.