#0566C5
Closest named color: Mid Blue (#276AB3). oklch(51.7% 0.168 255), rgb(5, 102, 197).
Aa
White text reads best on this color (5.65:1).
About this color
#0566C5 is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.168 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.035 away. White text reads best on it, at 5.65:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.168) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.71:1 |
| White text | 5.65:1 |
Values
| HEX | #0566C5 |
| RGB | rgb(5, 102, 197) |
| HSL | hsl(210, 95%, 40%) |
| OKLCH | oklch(51.7% 0.168 255) |
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 #0566C5 | 5.65:1 | AA | Lc -82.9 | Fine for body text |
| Black text on #0566C5 | 3.71:1 | AA large text | Lc 26.5 | Dividers and decoration only |
| #0566C5 text on white | 5.65:1 | AA | Lc 77.6 | Fine for body text |
| #0566C5 text on black | 3.71:1 | AA large text | Lc -24.2 | 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 700.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C6DBF7
oklch(88.5% 0.045 255.6)
-
Step 300
300
#9DC4F5
oklch(81% 0.081 254.4)
-
Step 400
400
#66A3F0
oklch(70.7% 0.13 255)
-
Step 500
500
#388AEB
oklch(63.2% 0.166 254.8)
-
Step 600
600
#0671D9
oklch(55.6% 0.18 255)
-
Step 700
700 (this color)
#0566C5
oklch(51.7% 0.168 255)
-
Step 800
800
#024D98
oklch(42.6% 0.139 255)
-
Step 900
900
#104179
oklch(37.7% 0.108 254.9)
-
Step 950
950
#0C2747
oklch(27.1% 0.068 254.6)
#0566C5 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) | #2C6FC9 | 0.033 |
| Deuteranopia (no green cones) | #0060C3 | 0.017 |
| Tritanopia (no blue cones) | #007D8C | 0.124 |
| Achromatopsia (no color) | #676767 | 0.168 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0566C5
#0566C5
oklch(51.7% 0.168 255)
- #8C5D00
#8C5D00
oklch(51.6% 0.109 74.8)
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 #0566C5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.035
- French Blue #436BAD ΔE 0.057
- Royal Blue #4169E1 ΔE 0.059
- Windows Blue #3778BF ΔE 0.062
- Cerulean Blue #056EEE ΔE 0.065
- Azul #1D5DEC ΔE 0.065
- Warm Blue #4B57DB ΔE 0.067
- Nice Blue #107AB0 ΔE 0.071
Use #0566C5 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.