#066D78
Closest named color: Dark Aqua (#05696B). oklch(48.9% 0.083 207.2), rgb(6, 109, 120).
Aa
White text reads best on this color (6.05:1).
About this color
#066D78 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 49%, its chroma 0.083 and its hue 207°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Aqua (#05696B), ΔE 0.022 away. White text reads best on it, at 6.05:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (49%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Dark Aqua (#05696B) |
| Black text | 3.46:1 |
| White text | 6.05:1 |
Values
| HEX | #066D78 |
| RGB | rgb(6, 109, 120) |
| HSL | hsl(186, 90%, 25%) |
| OKLCH | oklch(48.9% 0.083 207.2) |
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 #066D78 | 6.05:1 | AA | Lc -85.0 | Fine for body text |
| Black text on #066D78 | 3.46:1 | AA large text | Lc 24.3 | Dividers and decoration only |
| #066D78 text on white | 6.05:1 | AA | Lc 79.8 | Fine for body text |
| #066D78 text on black | 3.46:1 | AA large text | Lc -22.0 | 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
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E2ECEE
oklch(93.6% 0.011 211)
-
Step 200
200
#C9DEE1
oklch(88.6% 0.023 207.1)
-
Step 300
300
#A4C8CE
oklch(80.9% 0.039 208.8)
-
Step 400
400
#70ACB5
oklch(70.7% 0.063 207.8)
-
Step 500
500
#4497A3
oklch(63% 0.082 208.1)
-
Step 600
600
#1B828E
oklch(55.7% 0.089 207)
-
Step 700
700 (this color)
#066D78
oklch(48.9% 0.083 207.2)
-
Step 800
800
#0F5962
oklch(42.6% 0.068 207.6)
-
Step 900
900
#184950
oklch(37.6% 0.053 208.3)
-
Step 950
950
#102B2F
oklch(27% 0.033 208.2)
#066D78 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) | #626879 | 0.080 |
| Deuteranopia (no green cones) | #545E78 | 0.073 |
| Tritanopia (no blue cones) | #007370 | 0.026 |
| Achromatopsia (no color) | #626262 | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #066D78
#066D78
oklch(48.9% 0.083 207.2)
- #894D46
#894D46
oklch(48.9% 0.082 27.5)
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 #066D78, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Aqua #05696B ΔE 0.022
- Deep Turquoise #017374 ΔE 0.022
- Dark Aquamarine #017371 ΔE 0.025
- Deep Aqua #08787F ΔE 0.034
- Bluegreen #017A79 ΔE 0.041
- Petrol #005F6A ΔE 0.046
- Sea Blue #047495 ΔE 0.047
- Ocean #017B92 ΔE 0.052
Use #066D78 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.