#566CD2
Closest named color: Royal Blue (#4169E1). oklch(56.6% 0.158 271.4), rgb(86, 108, 210).
Aa
White text reads best on this color (4.69:1).
About this color
#566CD2 is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.158 and its hue 271°. 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 4.69:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.158) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.47:1 |
| White text | 4.69:1 |
Values
| HEX | #566CD2 |
| RGB | rgb(86, 108, 210) |
| HSL | hsl(229, 58%, 58%) |
| OKLCH | oklch(56.6% 0.158 271.4) |
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 #566CD2 | 4.69:1 | AA | Lc -77.8 | Fine for body text |
| Black text on #566CD2 | 4.47:1 | AA large text | Lc 31.7 | Non-text elements, placeholder text |
| #566CD2 text on white | 4.69:1 | AA | Lc 72.4 | Content text, not long reading |
| #566CD2 text on black | 4.47:1 | 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
#E5E9F8
oklch(93.5% 0.021 274)
-
Step 200
200
#CFD8F4
oklch(88.4% 0.04 271.4)
-
Step 300
300
#B0BFEF
oklch(81% 0.07 271.2)
-
Step 400
400
#879CE8
oklch(70.7% 0.114 271.5)
-
Step 500
500
#6A81E1
oklch(63% 0.146 271.5)
-
Step 600
600 (this color)
#566CD2
oklch(56.6% 0.158 271.4)
-
Step 700
700
#4457B3
oklch(49.2% 0.147 271.3)
-
Step 800
800
#384791
oklch(42.6% 0.123 271.7)
-
Step 900
900
#303D73
oklch(37.8% 0.093 271.1)
-
Step 950
950
#1C2444
oklch(27.1% 0.06 271.3)
#566CD2 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) | #3879D6 | 0.040 |
| Deuteranopia (no green cones) | #226FD0 | 0.046 |
| Tritanopia (no blue cones) | #008395 | 0.138 |
| Achromatopsia (no color) | #747474 | 0.158 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #566CD2
#566CD2
oklch(56.6% 0.158 271.4)
- #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 #566CD2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.034
- Dark Periwinkle #665FD1 ΔE 0.036
- Slate Blue #6A5ACD ΔE 0.048
- Light Indigo #6D5ACF ΔE 0.050
- Iris #6258C4 ΔE 0.052
- Windows Blue #3778BF ΔE 0.055
- Warm Blue #4B57DB ΔE 0.057
- Neon Blue #4361EE ΔE 0.057
Use #566CD2 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.