#566EE4
Closest named color: Royal Blue (#4169E1). oklch(58.2% 0.18 271.1), rgb(86, 110, 228).
Aa
Black text reads best on this color (4.74:1).
About this color
#566EE4 is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.180 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.028 away. Black text reads best on it, at 4.74:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.180) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.74:1 |
| White text | 4.42:1 |
Values
| HEX | #566EE4 |
| RGB | rgb(86, 110, 228) |
| HSL | hsl(230, 72%, 62%) |
| OKLCH | oklch(58.2% 0.18 271.1) |
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 #566EE4 | 4.42:1 | AA large text | Lc -75.8 | Fine for body text |
| Black text on #566EE4 | 4.74:1 | AA | Lc 33.7 | Non-text elements, placeholder text |
| #566EE4 text on white | 4.42:1 | AA large text | Lc 70.4 | Content text, not long reading |
| #566EE4 text on black | 4.74:1 | AA | Lc -31.3 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E4E9FA
oklch(93.5% 0.024 272.8)
-
Step 200
200
#CED8F8
oklch(88.5% 0.045 271.7)
-
Step 300
300
#ADBEF6
oklch(80.8% 0.082 271.4)
-
Step 400
400
#839BF1
oklch(70.7% 0.129 271)
-
Step 500
500
#667FED
oklch(63.1% 0.167 271.3)
-
Step 600
600 (this color)
#566EE4
oklch(58.2% 0.18 271.1)
-
Step 700
700
#4054BE
oklch(49.2% 0.167 270.9)
-
Step 800
800
#35459A
oklch(42.7% 0.139 271.3)
-
Step 900
900
#2D3B7A
oklch(37.6% 0.108 271)
-
Step 950
950
#1A2348
oklch(27% 0.07 270.8)
#566EE4 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) | #267EE8 | 0.050 |
| Deuteranopia (no green cones) | #0072E2 | 0.054 |
| Tritanopia (no blue cones) | #008A9E | 0.154 |
| Achromatopsia (no color) | #787878 | 0.180 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #566EE4
#566EE4
oklch(58.2% 0.18 271.1)
- #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 #566EE4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.028
- Neon Blue #4361EE ΔE 0.044
- Dark Periwinkle #665FD1 ΔE 0.046
- Cornflower #6A79F7 ΔE 0.048
- Medium Slate Blue #7B68EE ΔE 0.053
- Cerulean Blue #056EEE ΔE 0.055
- Clear Blue #247AFD ΔE 0.056
- Warm Blue #4B57DB ΔE 0.059
Use #566EE4 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.