#566BD0
Closest named color: Dark Periwinkle (#665FD1). oklch(56.3% 0.157 271.7), rgb(86, 107, 208).
Aa
White text reads best on this color (4.76:1).
About this color
#566BD0 is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.157 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.034 away. White text reads best on it, at 4.76:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.157) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.40:1 |
| White text | 4.76:1 |
Values
| HEX | #566BD0 |
| RGB | rgb(86, 107, 208) |
| HSL | hsl(230, 56%, 58%) |
| OKLCH | oklch(56.3% 0.157 271.7) |
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 #566BD0 | 4.76:1 | AA | Lc -78.2 | Fine for body text |
| Black text on #566BD0 | 4.40:1 | AA large text | Lc 31.3 | Non-text elements, placeholder text |
| #566BD0 text on white | 4.76:1 | AA | Lc 72.8 | Content text, not long reading |
| #566BD0 text on black | 4.40:1 | AA large text | Lc -28.9 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E5E9F8
oklch(93.5% 0.021 274)
-
Step 200
200
#D0D8F4
oklch(88.5% 0.04 272.9)
-
Step 300
300
#B0BFEF
oklch(81% 0.07 271.2)
-
Step 400
400
#889CE7
oklch(70.7% 0.112 271.9)
-
Step 500
500
#6B81E0
oklch(63% 0.145 271.8)
-
Step 600
600 (this color)
#566BD0
oklch(56.3% 0.157 271.7)
-
Step 700
700
#4557B2
oklch(49.2% 0.145 271.7)
-
Step 800
800
#394790
oklch(42.6% 0.121 272.2)
-
Step 900
900
#303D73
oklch(37.8% 0.093 271.1)
-
Step 950
950
#1C2443
oklch(27% 0.059 271.1)
#566BD0 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) | #3878D4 | 0.041 |
| Deuteranopia (no green cones) | #236ECE | 0.046 |
| Tritanopia (no blue cones) | #008293 | 0.139 |
| Achromatopsia (no color) | #737373 | 0.157 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #566BD0
#566BD0
oklch(56.3% 0.157 271.7)
- #8E7200
#8E7200
oklch(56.3% 0.115 91.6)
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 #566BD0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.034
- Royal Blue #4169E1 ΔE 0.036
- Slate Blue #6A5ACD ΔE 0.046
- Light Indigo #6D5ACF ΔE 0.049
- Iris #6258C4 ΔE 0.049
- Windows Blue #3778BF ΔE 0.054
- Warm Blue #4B57DB ΔE 0.056
- Neon Blue #4361EE ΔE 0.059
Use #566BD0 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.