#0566DF
Closest named color: Azul (#1D5DEC). oklch(53.7% 0.201 258.5), rgb(5, 102, 223).
Aa
White text reads best on this color (5.28:1).
About this color
#0566DF is a medium-dark, vivid blue. In OKLCH its lightness is 54%, its chroma 0.201 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Azul (#1D5DEC), ΔE 0.029 away. White text reads best on it, at 5.28:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.201) |
| Temperature | cool |
| Nearest name | Azul (#1D5DEC) |
| Black text | 3.97:1 |
| White text | 5.28:1 |
Values
| HEX | #0566DF |
| RGB | rgb(5, 102, 223) |
| HSL | hsl(213, 96%, 45%) |
| OKLCH | oklch(53.7% 0.201 258.5) |
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 #0566DF | 5.28:1 | AA | Lc -80.8 | Fine for body text |
| Black text on #0566DF | 3.97:1 | AA large text | Lc 28.7 | Dividers and decoration only |
| #0566DF text on white | 5.28:1 | AA | Lc 75.4 | Fine for body text |
| #0566DF text on black | 3.97:1 | AA large text | Lc -26.3 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#DFEBFC
oklch(93.6% 0.026 257)
-
Step 200
200
#C5DBFB
oklch(88.5% 0.05 257.7)
-
Step 300
300
#9DC2FB
oklch(80.8% 0.091 258.9)
-
Step 400
400
#66A1F9
oklch(70.7% 0.144 258.2)
-
Step 500
500
#3A86F7
oklch(63.2% 0.185 258.5)
-
Step 600
600 (this color)
#0566DF
oklch(53.7% 0.201 258.5)
-
Step 700
700
#0059C7
oklch(49% 0.186 258.6)
-
Step 800
800
#084AA1
oklch(42.7% 0.154 258.4)
-
Step 900
900
#123F80
oklch(37.8% 0.12 258.4)
-
Step 950
950
#0C254B
oklch(26.9% 0.077 258.8)
#0566DF 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) | #0075E3 | 0.038 |
| Deuteranopia (no green cones) | #0063DD | 0.008 |
| Tritanopia (no blue cones) | #008498 | 0.151 |
| Achromatopsia (no color) | #6C6C6C | 0.201 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0566DF
#0566DF
oklch(53.7% 0.201 258.5)
- #916400
#916400
oklch(53.7% 0.112 77.9)
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 #0566DF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Azul #1D5DEC ΔE 0.029
- Cerulean Blue #056EEE ΔE 0.030
- Royal Blue #4169E1 ΔE 0.037
- Bright Blue #0165FC ΔE 0.044
- Neon Blue #4361EE ΔE 0.044
- Warm Blue #4B57DB ΔE 0.053
- Electric Blue #0652FF ΔE 0.065
- Clear Blue #247AFD ΔE 0.069
Use #0566DF 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.