#566BDB
Closest named color: Royal Blue (#4169E1). oklch(57% 0.172 271.9), rgb(86, 107, 219).
Aa
White text reads best on this color (4.64:1).
About this color
#566BDB is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.172 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.026 away. White text reads best on it, at 4.64:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.172) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.52:1 |
| White text | 4.64:1 |
Values
| HEX | #566BDB |
| RGB | rgb(86, 107, 219) |
| HSL | hsl(231, 65%, 60%) |
| OKLCH | oklch(57% 0.172 271.9) |
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 #566BDB | 4.64:1 | AA | Lc -77.4 | Fine for body text |
| Black text on #566BDB | 4.52:1 | AA | Lc 32.1 | Non-text elements, placeholder text |
| #566BDB text on white | 4.64:1 | AA | Lc 72.0 | Content text, not long reading |
| #566BDB text on black | 4.52:1 | AA | Lc -29.7 | Dividers and decoration only |
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
#E4E9F9
oklch(93.5% 0.022 272.1)
-
Step 200
200
#CFD8F6
oklch(88.5% 0.042 272.3)
-
Step 300
300
#AFBEF3
oklch(80.9% 0.077 272.3)
-
Step 400
400
#869BEE
oklch(70.8% 0.124 272.1)
-
Step 500
500
#6980E8
oklch(63.2% 0.158 271.8)
-
Step 600
600 (this color)
#566BDB
oklch(57% 0.172 271.9)
-
Step 700
700
#4354BA
oklch(49% 0.161 272)
-
Step 800
800
#374696
oklch(42.7% 0.132 271.7)
-
Step 900
900
#2F3B78
oklch(37.6% 0.104 272.1)
-
Step 950
950
#1B2346
oklch(26.9% 0.066 271.6)
#566BDB 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) | #2B7BDF | 0.050 |
| Deuteranopia (no green cones) | #006FD9 | 0.056 |
| Tritanopia (no blue cones) | #008599 | 0.147 |
| Achromatopsia (no color) | #747474 | 0.172 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #566BDB
#566BDB
oklch(57% 0.172 271.9)
- #907400
#907400
oklch(57% 0.116 91.9)
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 #566BDB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.026
- Dark Periwinkle #665FD1 ΔE 0.035
- Neon Blue #4361EE ΔE 0.046
- Slate Blue #6A5ACD ΔE 0.049
- Light Indigo #6D5ACF ΔE 0.050
- Warm Blue #4B57DB ΔE 0.052
- Iris #6258C4 ΔE 0.056
- Cerulean Blue #056EEE ΔE 0.059
Use #566BDB 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.