#566CFA
Closest named color: Neon Blue (#4361EE). oklch(59.5% 0.212 271.7), rgb(86, 108, 250).
Aa
Black text reads best on this color (4.92:1).
About this color
#566CFA is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.212 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Neon Blue (#4361EE), ΔE 0.040 away. Black text reads best on it, at 4.92:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.212) |
| Temperature | cool |
| Nearest name | Neon Blue (#4361EE) |
| Black text | 4.92:1 |
| White text | 4.26:1 |
Values
| HEX | #566CFA |
| RGB | rgb(86, 108, 250) |
| HSL | hsl(232, 94%, 66%) |
| OKLCH | oklch(59.5% 0.212 271.7) |
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 #566CFA | 4.26:1 | AA large text | Lc -74.5 | Content text, not long reading |
| Black text on #566CFA | 4.92:1 | AA | Lc 35.1 | Non-text elements, placeholder text |
| #566CFA text on white | 4.26:1 | AA large text | Lc 69.0 | Content text, not long reading |
| #566CFA 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 500.
-
Step 50
50
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E2E9FF
oklch(93.5% 0.031 271.7)
-
Step 200
200
#CCD8FF
oklch(88.6% 0.055 271.8)
-
Step 300
300
#AABDFF
oklch(80.8% 0.096 271.7)
-
Step 400
400
#7F98FF
oklch(70.6% 0.153 271.7)
-
Step 500
500 (this color)
#566CFA
oklch(59.5% 0.212 271.7)
-
Step 600
600
#4A5BF7
oklch(55.6% 0.23 271.7)
-
Step 700
700
#3C49D7
oklch(49.1% 0.214 271.6)
-
Step 800
800
#313DAE
oklch(42.7% 0.178 271.7)
-
Step 900
900
#2A3689
oklch(37.6% 0.138 271.8)
-
Step 950
950
#182150
oklch(27% 0.087 271.3)
#566CFA 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) | #0082FF | 0.064 |
| Deuteranopia (no green cones) | #0073F7 | 0.053 |
| Tritanopia (no blue cones) | #008FA9 | 0.174 |
| Achromatopsia (no color) | #7A7A7A | 0.212 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #566CFA
#566CFA
oklch(59.5% 0.212 271.7)
- #997B00
#997B00
oklch(59.4% 0.122 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 #566CFA, closest first.
No curated palette has a color within ΔE 0.04 of #566CFA.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Neon Blue #4361EE ΔE 0.040
- Cornflower #6A79F7 ΔE 0.043
- Royal Blue #4169E1 ΔE 0.046
- Clear Blue #247AFD ΔE 0.046
- Medium Slate Blue #7B68EE ΔE 0.053
- Cerulean Blue #056EEE ΔE 0.057
- Bright Blue #0165FC ΔE 0.062
- Dark Periwinkle #665FD1 ΔE 0.069
Use #566CFA 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.