#566BEB
Closest named color: Royal Blue (#4169E1). oklch(58.2% 0.193 272), rgb(86, 107, 235).
Aa
Black text reads best on this color (4.69:1).
About this color
#566BEB is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.193 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.029 away. Black text reads best on it, at 4.69:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.193) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.69:1 |
| White text | 4.46:1 |
Values
| HEX | #566BEB |
| RGB | rgb(86, 107, 235) |
| HSL | hsl(232, 79%, 63%) |
| OKLCH | oklch(58.2% 0.193 272) |
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 #566BEB | 4.46:1 | AA large text | Lc -76.1 | Fine for body text |
| Black text on #566BEB | 4.69:1 | AA | Lc 33.5 | Non-text elements, placeholder text |
| #566BEB text on white | 4.46:1 | AA large text | Lc 70.6 | Content text, not long reading |
| #566BEB text on black | 4.69:1 | AA | Lc -31.0 | 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
#E4E9FB
oklch(93.6% 0.025 273.5)
-
Step 200
200
#CED8FA
oklch(88.5% 0.048 272.4)
-
Step 300
300
#ADBEFA
oklch(81% 0.087 272.1)
-
Step 400
400
#839AF7
oklch(70.8% 0.139 271.9)
-
Step 500
500
#667DF3
oklch(63.1% 0.177 272.1)
-
Step 600
600 (this color)
#566BEB
oklch(58.2% 0.193 272)
-
Step 700
700
#4151C4
oklch(49.1% 0.179 272)
-
Step 800
800
#35439F
oklch(42.7% 0.149 272)
-
Step 900
900
#2D3A7E
oklch(37.7% 0.116 271.6)
-
Step 950
950
#1A224A
oklch(26.9% 0.075 272)
#566BEB 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) | #007EEF | 0.062 |
| Deuteranopia (no green cones) | #0071E8 | 0.054 |
| Tritanopia (no blue cones) | #008AA1 | 0.162 |
| Achromatopsia (no color) | #777777 | 0.194 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #566BEB
#566BEB
oklch(58.2% 0.193 272)
- #947800
#947800
oklch(58.3% 0.119 92.5)
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 #566BEB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.029
- Neon Blue #4361EE ΔE 0.035
- Cornflower #6A79F7 ΔE 0.048
- Dark Periwinkle #665FD1 ΔE 0.049
- Medium Slate Blue #7B68EE ΔE 0.051
- Cerulean Blue #056EEE ΔE 0.053
- Clear Blue #247AFD ΔE 0.053
- Warm Blue #4B57DB ΔE 0.056
Use #566BEB 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.