#566AF9
Closest named color: Neon Blue (#4361EE). oklch(59.1% 0.213 272.1), rgb(86, 106, 249).
Aa
Black text reads best on this color (4.82:1).
About this color
#566AF9 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.213 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Neon Blue (#4361EE), ΔE 0.037 away. Black text reads best on it, at 4.82:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.213) |
| Temperature | cool |
| Nearest name | Neon Blue (#4361EE) |
| Black text | 4.82:1 |
| White text | 4.35:1 |
Values
| HEX | #566AF9 |
| RGB | rgb(86, 106, 249) |
| HSL | hsl(233, 93%, 66%) |
| OKLCH | oklch(59.1% 0.213 272.1) |
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 #566AF9 | 4.35:1 | AA large text | Lc -75.2 | Fine for body text |
| Black text on #566AF9 | 4.82:1 | AA | Lc 34.4 | Non-text elements, placeholder text |
| #566AF9 text on white | 4.35:1 | AA large text | Lc 69.7 | Content text, not long reading |
| #566AF9 text on black | 4.82:1 | AA | Lc -32.0 | 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
#E3E9FD
oklch(93.5% 0.028 272.5)
-
Step 200
200
#CDD8FD
oklch(88.6% 0.052 272.2)
-
Step 300
300
#ABBDFF
oklch(80.9% 0.096 272.3)
-
Step 400
400
#8098FF
oklch(70.7% 0.153 272.1)
-
Step 500
500
#637AFE
oklch(63.1% 0.196 272.1)
-
Step 600
600 (this color)
#566AF9
oklch(59.1% 0.213 272.1)
-
Step 700
700
#3F4DCE
oklch(49.1% 0.197 272.1)
-
Step 800
800
#3440A7
oklch(42.8% 0.164 272.3)
-
Step 900
900
#2C3884
oklch(37.7% 0.128 272.1)
-
Step 950
950
#1A214D
oklch(26.9% 0.081 272.9)
#566AF9 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) | #0081FE | 0.066 |
| Deuteranopia (no green cones) | #0072F6 | 0.053 |
| Tritanopia (no blue cones) | #008DA7 | 0.175 |
| Achromatopsia (no color) | #797979 | 0.213 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #566AF9
#566AF9
oklch(59.1% 0.213 272.1)
- #977A00
#977A00
oklch(59% 0.121 92.1)
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 #566AF9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Neon Blue #4361EE ΔE 0.037
- Royal Blue #4169E1 ΔE 0.044
- Cornflower #6A79F7 ΔE 0.047
- Clear Blue #247AFD ΔE 0.049
- Medium Slate Blue #7B68EE ΔE 0.053
- Cerulean Blue #056EEE ΔE 0.057
- Bright Blue #0165FC ΔE 0.060
- Warm Blue #4B57DB ΔE 0.065
Use #566AF9 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.