#066DC3
Closest named color: Mid Blue (#276AB3). oklch(53.2% 0.157 252), rgb(6, 109, 195).
Aa
White text reads best on this color (5.27:1).
About this color
#066DC3 is a medium-dark, vivid blue. In OKLCH its lightness is 53%, its chroma 0.157 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.026 away. White text reads best on it, at 5.27:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.157) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.98:1 |
| White text | 5.27:1 |
Values
| HEX | #066DC3 |
| RGB | rgb(6, 109, 195) |
| HSL | hsl(207, 94%, 39%) |
| OKLCH | oklch(53.2% 0.157 252) |
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 #066DC3 | 5.27:1 | AA | Lc -80.9 | Fine for body text |
| Black text on #066DC3 | 3.98:1 | AA large text | Lc 28.6 | Dividers and decoration only |
| #066DC3 text on white | 5.27:1 | AA | Lc 75.5 | Fine for body text |
| #066DC3 text on black | 3.98:1 | AA large text | Lc -26.2 | 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 600.
-
Step 50
50
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF8
oklch(93.6% 0.021 252.5)
-
Step 200
200
#C7DBF3
oklch(88.4% 0.04 253)
-
Step 300
300
#A0C4EE
oklch(80.9% 0.071 252.6)
-
Step 400
400
#6AA5E5
oklch(70.8% 0.113 251.5)
-
Step 500
500
#3F8CDD
oklch(63% 0.144 252.1)
-
Step 600
600 (this color)
#066DC3
oklch(53.2% 0.157 252)
-
Step 700
700
#0361B0
oklch(49.1% 0.146 252.3)
-
Step 800
800
#0B508E
oklch(42.7% 0.12 251.8)
-
Step 900
900
#154372
oklch(37.8% 0.094 252.2)
-
Step 950
950
#0E2742
oklch(26.9% 0.059 252.4)
#066DC3 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) | #3F74C6 | 0.040 |
| Deuteranopia (no green cones) | #1665C1 | 0.021 |
| Tritanopia (no blue cones) | #00828E | 0.116 |
| Achromatopsia (no color) | #6C6C6C | 0.157 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #066DC3
#066DC3
oklch(53.2% 0.157 252)
- #945F00
#945F00
oklch(53.1% 0.114 71.7)
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 #066DC3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.026
- Windows Blue #3778BF ΔE 0.044
- French Blue #436BAD ΔE 0.047
- Nice Blue #107AB0 ΔE 0.052
- Flat Blue #3C73A8 ΔE 0.056
- Royal Blue #4169E1 ΔE 0.060
- Muted Blue #3B719F ΔE 0.065
- Ocean Blue #03719C ΔE 0.066
Use #066DC3 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.