#566DCD
Closest named color: Dark Periwinkle (#665FD1). oklch(56.5% 0.15 270.8), rgb(86, 109, 205).
Aa
White text reads best on this color (4.70:1).
About this color
#566DCD is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.150 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.040 away. White text reads best on it, at 4.70:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.150) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.46:1 |
| White text | 4.70:1 |
Values
| HEX | #566DCD |
| RGB | rgb(86, 109, 205) |
| HSL | hsl(228, 54%, 57%) |
| OKLCH | oklch(56.5% 0.15 270.8) |
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 #566DCD | 4.70:1 | AA | Lc -77.9 | Fine for body text |
| Black text on #566DCD | 4.46:1 | AA large text | Lc 31.7 | Non-text elements, placeholder text |
| #566DCD text on white | 4.70:1 | AA | Lc 72.4 | Content text, not long reading |
| #566DCD text on black | 4.46:1 | AA large text | Lc -29.3 | 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
#E5E9F7
oklch(93.5% 0.019 273.2)
-
Step 200
200
#D0D8F3
oklch(88.5% 0.038 272.5)
-
Step 300
300
#B0BFED
oklch(80.9% 0.067 270.7)
-
Step 400
400
#879DE4
oklch(70.7% 0.107 270.3)
-
Step 500
500
#6B83DC
oklch(63.2% 0.137 270.7)
-
Step 600
600 (this color)
#566DCD
oklch(56.5% 0.15 270.8)
-
Step 700
700
#4458AF
oklch(49.1% 0.14 270.7)
-
Step 800
800
#38488D
oklch(42.6% 0.115 271)
-
Step 900
900
#303D71
oklch(37.6% 0.09 271)
-
Step 950
950
#1C2442
oklch(26.9% 0.057 270.9)
#566DCD 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) | #3F79D1 | 0.036 |
| Deuteranopia (no green cones) | #2D6FCB | 0.040 |
| Tritanopia (no blue cones) | #008393 | 0.134 |
| Achromatopsia (no color) | #747474 | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #566DCD
#566DCD
oklch(56.5% 0.15 270.8)
- #8F7200
#8F7200
oklch(56.4% 0.115 91)
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 #566DCD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.040
- Royal Blue #4169E1 ΔE 0.041
- Windows Blue #3778BF ΔE 0.048
- Slate Blue #6A5ACD ΔE 0.051
- Iris #6258C4 ΔE 0.053
- Light Indigo #6D5ACF ΔE 0.053
- French Blue #436BAD ΔE 0.056
- Warm Blue #4B57DB ΔE 0.063
Use #566DCD 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.