#566EF3
Closest named color: Royal Blue (#4169E1). oklch(59.3% 0.2 271.3), rgb(86, 110, 243).
Aa
Black text reads best on this color (4.92:1).
About this color
#566EF3 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.200 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.039 away. Black text reads best on it, at 4.92:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.200) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.92:1 |
| White text | 4.26:1 |
Values
| HEX | #566EF3 |
| RGB | rgb(86, 110, 243) |
| HSL | hsl(231, 87%, 65%) |
| OKLCH | oklch(59.3% 0.2 271.3) |
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 #566EF3 | 4.26:1 | AA large text | Lc -74.6 | Content text, not long reading |
| Black text on #566EF3 | 4.92:1 | AA | Lc 35.0 | Non-text elements, placeholder text |
| #566EF3 text on white | 4.26:1 | AA large text | Lc 69.1 | Content text, not long reading |
| #566EF3 text on black | 4.92:1 | AA | Lc -32.6 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3E9FC
oklch(93.5% 0.027 271.9)
-
Step 200
200
#CDD8FB
oklch(88.5% 0.05 271.6)
-
Step 300
300
#ABBEFC
oklch(80.9% 0.09 271.1)
-
Step 400
400
#8099FA
oklch(70.6% 0.145 271.4)
-
Step 500
500
#637DF7
oklch(63.2% 0.183 271.2)
-
Step 600
600 (this color)
#566EF3
oklch(59.3% 0.2 271.3)
-
Step 700
700
#3E50C8
oklch(49.1% 0.186 271.2)
-
Step 800
800
#3342A2
oklch(42.7% 0.155 271.4)
-
Step 900
900
#2C3980
oklch(37.6% 0.12 271.6)
-
Step 950
950
#19224B
oklch(26.9% 0.077 271.1)
#566EF3 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) | #0082F8 | 0.061 |
| Deuteranopia (no green cones) | #0074F0 | 0.053 |
| Tritanopia (no blue cones) | #008EA6 | 0.166 |
| Achromatopsia (no color) | #7A7A7A | 0.201 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #566EF3
#566EF3
oklch(59.3% 0.2 271.3)
- #997A00
#997A00
oklch(59.2% 0.121 90.9)
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 #566EF3, closest first.
No curated palette has a color within ΔE 0.04 of #566EF3.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.039
- Cornflower #6A79F7 ΔE 0.039
- Neon Blue #4361EE ΔE 0.041
- Clear Blue #247AFD ΔE 0.046
- Medium Slate Blue #7B68EE ΔE 0.050
- Cerulean Blue #056EEE ΔE 0.055
- Dark Periwinkle #665FD1 ΔE 0.062
- Bright Blue #0165FC ΔE 0.065
Use #566EF3 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.