#066DCD
Closest named color: Mid Blue (#276AB3). oklch(53.9% 0.17 254.1), rgb(6, 109, 205).
Aa
White text reads best on this color (5.15:1).
About this color
#066DCD is a medium-dark, vivid blue. In OKLCH its lightness is 54%, its chroma 0.170 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.041 away. White text reads best on it, at 5.15:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.170) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 4.07:1 |
| White text | 5.15:1 |
Values
| HEX | #066DCD |
| RGB | rgb(6, 109, 205) |
| HSL | hsl(209, 94%, 41%) |
| OKLCH | oklch(53.9% 0.17 254.1) |
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 #066DCD | 5.15:1 | AA | Lc -80.2 | Fine for body text |
| Black text on #066DCD | 4.07:1 | AA large text | Lc 29.3 | Dividers and decoration only |
| #066DCD text on white | 5.15:1 | AA | Lc 74.8 | Content text, not long reading |
| #066DCD text on black | 4.07:1 | AA large text | Lc -26.9 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C6DBF5
oklch(88.4% 0.042 253.8)
-
Step 300
300
#9FC4F2
oklch(81% 0.077 254.1)
-
Step 400
400
#69A4EB
oklch(70.8% 0.122 253.9)
-
Step 500
500
#3D8BE5
oklch(63.2% 0.156 254.1)
-
Step 600
600 (this color)
#066DCD
oklch(53.9% 0.17 254.1)
-
Step 700
700
#005FB6
oklch(49% 0.157 254.2)
-
Step 800
800
#084E94
oklch(42.6% 0.131 254.3)
-
Step 900
900
#134276
oklch(37.8% 0.102 254)
-
Step 950
950
#0D2745
oklch(27% 0.064 254)
#066DCD 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) | #3576D1 | 0.037 |
| Deuteranopia (no green cones) | #0066CB | 0.019 |
| Tritanopia (no blue cones) | #008493 | 0.125 |
| Achromatopsia (no color) | #6D6D6D | 0.170 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #066DCD
#066DCD
oklch(53.9% 0.17 254.1)
- #956200
#956200
oklch(53.8% 0.114 73.7)
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 #066DCD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.041
- Royal Blue #4169E1 ΔE 0.047
- Windows Blue #3778BF ΔE 0.049
- Cerulean Blue #056EEE ΔE 0.051
- French Blue #436BAD ΔE 0.058
- Azul #1D5DEC ΔE 0.063
- Nice Blue #107AB0 ΔE 0.063
- Flat Blue #3C73A8 ΔE 0.069
Use #066DCD 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.