#566FDF
Closest named color: Royal Blue (#4169E1). oklch(58.1% 0.172 270.7), rgb(86, 111, 223).
Aa
Black text reads best on this color (4.73:1).
About this color
#566FDF is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.172 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.030 away. Black text reads best on it, at 4.73:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.172) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.73:1 |
| White text | 4.43:1 |
Values
| HEX | #566FDF |
| RGB | rgb(86, 111, 223) |
| HSL | hsl(229, 68%, 61%) |
| OKLCH | oklch(58.1% 0.172 270.7) |
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 #566FDF | 4.43:1 | AA large text | Lc -75.9 | Fine for body text |
| Black text on #566FDF | 4.73:1 | AA | Lc 33.6 | Non-text elements, placeholder text |
| #566FDF text on white | 4.43:1 | AA large text | Lc 70.5 | Content text, not long reading |
| #566FDF text on black | 4.73:1 | AA | Lc -31.2 | Non-text elements, placeholder text |
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
#CED8F6
oklch(88.4% 0.043 270.9)
-
Step 300
300
#AEBFF4
oklch(81% 0.077 270.8)
-
Step 400
400
#849CEE
oklch(70.8% 0.123 270.6)
-
Step 500
500
#6680E8
oklch(63% 0.159 270.7)
-
Step 600
600 (this color)
#566FDF
oklch(58.1% 0.172 270.7)
-
Step 700
700
#4155BA
oklch(49.1% 0.16 270.9)
-
Step 800
800
#354696
oklch(42.6% 0.132 270.8)
-
Step 900
900
#2E3C78
oklch(37.8% 0.103 270.9)
-
Step 950
950
#1B2346
oklch(26.9% 0.066 271.6)
#566FDF 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) | #317EE3 | 0.045 |
| Deuteranopia (no green cones) | #0972DD | 0.052 |
| Tritanopia (no blue cones) | #00899C | 0.148 |
| Achromatopsia (no color) | #787878 | 0.172 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #566FDF
#566FDF
oklch(58.1% 0.172 270.7)
- #957700
#957700
oklch(58.1% 0.119 91.1)
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 #566FDF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.030
- Dark Periwinkle #665FD1 ΔE 0.045
- Neon Blue #4361EE ΔE 0.049
- Cornflower #6A79F7 ΔE 0.051
- Medium Slate Blue #7B68EE ΔE 0.057
- Slate Blue #6A5ACD ΔE 0.058
- Cerulean Blue #056EEE ΔE 0.058
- Light Indigo #6D5ACF ΔE 0.058
Use #566FDF 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.