#166F78
Closest named color: Deep Turquoise (#017374). oklch(49.7% 0.079 205.4), rgb(22, 111, 120).
Aa
White text reads best on this color (5.86:1).
About this color
#166F78 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 50%, its chroma 0.079 and its hue 205°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Turquoise (#017374), ΔE 0.017 away. White text reads best on it, at 5.86:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.079) |
| Temperature | cool |
| Nearest name | Deep Turquoise (#017374) |
| Black text | 3.57:1 |
| White text | 5.86:1 |
Values
| HEX | #166F78 |
| RGB | rgb(22, 111, 120) |
| HSL | hsl(186, 69%, 28%) |
| OKLCH | oklch(49.7% 0.079 205.4) |
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 #166F78 | 5.86:1 | AA | Lc -84.2 | Fine for body text |
| Black text on #166F78 | 3.57:1 | AA large text | Lc 25.1 | Dividers and decoration only |
| #166F78 text on white | 5.86:1 | AA | Lc 79.0 | Fine for body text |
| #166F78 text on black | 3.57:1 | AA large text | Lc -22.8 | 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
#E2ECED
oklch(93.6% 0.011 204.1)
-
Step 200
200
#CADDE0
oklch(88.4% 0.021 208.1)
-
Step 300
300
#A5C8CC
oklch(80.9% 0.038 205)
-
Step 400
400
#72ACB3
oklch(70.7% 0.061 205.5)
-
Step 500
500
#4897A0
oklch(63% 0.078 205.3)
-
Step 600
600
#23818B
oklch(55.5% 0.085 205.6)
-
Step 700
700 (this color)
#166F78
oklch(49.7% 0.079 205.4)
-
Step 800
800
#155960
oklch(42.7% 0.065 205.2)
-
Step 900
900
#1A494F
oklch(37.6% 0.051 206.8)
-
Step 950
950
#112B2E
oklch(27% 0.032 205.4)
#166F78 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) | #656A79 | 0.078 |
| Deuteranopia (no green cones) | #586078 | 0.072 |
| Tritanopia (no blue cones) | #007472 | 0.022 |
| Achromatopsia (no color) | #656565 | 0.080 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #166F78
#166F78
oklch(49.7% 0.079 205.4)
- #8A504B
#8A504B
oklch(49.7% 0.079 25.5)
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 #166F78, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Turquoise #017374 ΔE 0.017
- Dark Aquamarine #017371 ΔE 0.020
- Dark Aqua #05696B ΔE 0.027
- Deep Aqua #08787F ΔE 0.027
- Bluegreen #017A79 ΔE 0.034
- Sea Blue #047495 ΔE 0.045
- Ocean #017B92 ΔE 0.047
- Teal #008080 ΔE 0.051
Use #166F78 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.