#0066C6
Closest named color: Mid Blue (#276AB3). oklch(51.7% 0.169 254.8), rgb(0, 102, 198).
Aa
White text reads best on this color (5.65:1).
About this color
#0066C6 is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.169 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.036 away. White text reads best on it, at 5.65:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.169) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.71:1 |
| White text | 5.65:1 |
Values
| HEX | #0066C6 |
| RGB | rgb(0, 102, 198) |
| HSL | hsl(209, 100%, 39%) |
| OKLCH | oklch(51.7% 0.169 254.8) |
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 #0066C6 | 5.65:1 | AA | Lc -82.8 | Fine for body text |
| Black text on #0066C6 | 3.71:1 | AA large text | Lc 26.6 | Dividers and decoration only |
| #0066C6 text on white | 5.65:1 | AA | Lc 77.5 | Fine for body text |
| #0066C6 text on black | 3.71:1 | AA large text | Lc -24.3 | 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 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
#C5DBF7
oklch(88.4% 0.045 254.5)
-
Step 300
300
#9DC4F5
oklch(81% 0.081 254.4)
-
Step 400
400
#65A3F1
oklch(70.7% 0.132 254.9)
-
Step 500
500
#368AEC
oklch(63.2% 0.168 254.7)
-
Step 600
600
#0071DA
oklch(55.6% 0.182 254.8)
-
Step 700
700 (this color)
#0066C6
oklch(51.7% 0.169 254.8)
-
Step 800
800
#004D99
oklch(42.7% 0.14 255)
-
Step 900
900
#0F417A
oklch(37.7% 0.11 255)
-
Step 950
950
#0B2747
oklch(27.1% 0.068 254.1)
#0066C6 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) | #2B70CA | 0.036 |
| Deuteranopia (no green cones) | #0060C4 | 0.016 |
| Tritanopia (no blue cones) | #007E8C | 0.127 |
| Achromatopsia (no color) | #676767 | 0.169 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0066C6
#0066C6
oklch(51.7% 0.169 254.8)
- #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 #0066C6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.036
- French Blue #436BAD ΔE 0.058
- Royal Blue #4169E1 ΔE 0.059
- Windows Blue #3778BF ΔE 0.063
- Azul #1D5DEC ΔE 0.064
- Cerulean Blue #056EEE ΔE 0.064
- Warm Blue #4B57DB ΔE 0.067
- Nice Blue #107AB0 ΔE 0.072
Use #0066C6 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.