#066FB5
Closest named color: Mid Blue (#276AB3). oklch(52.7% 0.137 247.2), rgb(6, 111, 181).
Aa
White text reads best on this color (5.31:1).
About this color
#066FB5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.137 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.017 away. White text reads best on it, at 5.31:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.94:1 |
| White text | 5.31:1 |
Values
| HEX | #066FB5 |
| RGB | rgb(6, 111, 181) |
| HSL | hsl(204, 94%, 37%) |
| OKLCH | oklch(52.7% 0.137 247.2) |
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 #066FB5 | 5.31:1 | AA | Lc -81.2 | Fine for body text |
| Black text on #066FB5 | 3.94:1 | AA large text | Lc 28.2 | Dividers and decoration only |
| #066FB5 text on white | 5.31:1 | AA | Lc 75.8 | Fine for body text |
| #066FB5 text on black | 3.94:1 | AA large text | Lc -25.9 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF5
oklch(93.5% 0.017 248)
-
Step 200
200
#C8DCEF
oklch(88.5% 0.034 246.8)
-
Step 300
300
#A1C5E7
oklch(80.9% 0.062 247.1)
-
Step 400
400
#6CA6DB
oklch(70.6% 0.099 247.2)
-
Step 500
500
#418FD1
oklch(63.1% 0.126 247)
-
Step 600
600 (this color)
#066FB5
oklch(52.7% 0.137 247.2)
-
Step 700
700
#0564A4
oklch(49% 0.128 247.3)
-
Step 800
800
#0D5285
oklch(42.7% 0.106 247.2)
-
Step 900
900
#16446B
oklch(37.6% 0.083 247.9)
-
Step 950
950
#0F283E
oklch(26.9% 0.052 247.6)
#066FB5 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) | #4C73B8 | 0.049 |
| Deuteranopia (no green cones) | #3265B4 | 0.031 |
| Tritanopia (no blue cones) | #008089 | 0.097 |
| Achromatopsia (no color) | #6B6B6B | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #066FB5
#066FB5
oklch(52.7% 0.137 247.2)
- #975B00
#975B00
oklch(52.7% 0.117 66.7)
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 #066FB5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.017
- Nice Blue #107AB0 ΔE 0.035
- French Blue #436BAD ΔE 0.036
- Flat Blue #3C73A8 ΔE 0.039
- Windows Blue #3778BF ΔE 0.041
- Ocean Blue #03719C ΔE 0.042
- Muted Blue #3B719F ΔE 0.045
- Peacock Blue #016795 ΔE 0.053
Use #066FB5 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.