#566EF0
Closest named color: Royal Blue (#4169E1). oklch(59.1% 0.196 271.3), rgb(86, 110, 240).
Aa
Black text reads best on this color (4.88:1).
About this color
#566EF0 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.196 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.036 away. Black text reads best on it, at 4.88:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.196) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.88:1 |
| White text | 4.29:1 |
Values
| HEX | #566EF0 |
| RGB | rgb(86, 110, 240) |
| HSL | hsl(231, 84%, 64%) |
| OKLCH | oklch(59.1% 0.196 271.3) |
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 #566EF0 | 4.29:1 | AA large text | Lc -74.8 | Content text, not long reading |
| Black text on #566EF0 | 4.88:1 | AA | Lc 34.7 | Non-text elements, placeholder text |
| #566EF0 text on white | 4.29:1 | AA large text | Lc 69.3 | Content text, not long reading |
| #566EF0 text on black | 4.88:1 | AA | Lc -32.3 | 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
#ACBEFA
oklch(80.9% 0.087 271.4)
-
Step 400
400
#819AF8
oklch(70.7% 0.141 271.2)
-
Step 500
500
#637DF5
oklch(63% 0.181 271.2)
-
Step 600
600 (this color)
#566EF0
oklch(59.1% 0.196 271.3)
-
Step 700
700
#3F51C6
oklch(49.2% 0.182 271.4)
-
Step 800
800
#3343A0
oklch(42.7% 0.151 271.1)
-
Step 900
900
#2C3A7F
oklch(37.7% 0.117 271.1)
-
Step 950
950
#1A224A
oklch(26.9% 0.075 272)
#566EF0 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) | #0081F4 | 0.061 |
| Deuteranopia (no green cones) | #0073ED | 0.053 |
| Tritanopia (no blue cones) | #008DA4 | 0.164 |
| Achromatopsia (no color) | #7A7A7A | 0.196 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #566EF0
#566EF0
oklch(59.1% 0.196 271.3)
- #987A00
#987A00
oklch(59.1% 0.121 91.5)
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 #566EF0, closest first.
No curated palette has a color within ΔE 0.04 of #566EF0.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.036
- Cornflower #6A79F7 ΔE 0.040
- Neon Blue #4361EE ΔE 0.040
- Clear Blue #247AFD ΔE 0.047
- Medium Slate Blue #7B68EE ΔE 0.050
- Cerulean Blue #056EEE ΔE 0.054
- Dark Periwinkle #665FD1 ΔE 0.058
- Warm Blue #4B57DB ΔE 0.065
Use #566EF0 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.