#166C80
Closest named color: Deep Turquoise (#017374). oklch(49.3% 0.082 218), rgb(22, 108, 128).
Aa
White text reads best on this color (6.01:1).
About this color
#166C80 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 49%, its chroma 0.082 and its hue 218°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Turquoise (#017374), ΔE 0.034 away. White text reads best on it, at 6.01:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (49%) |
| Chroma | moderately saturated (0.082) |
| Temperature | cool |
| Nearest name | Deep Turquoise (#017374) |
| Black text | 3.49:1 |
| White text | 6.01:1 |
Values
| HEX | #166C80 |
| RGB | rgb(22, 108, 128) |
| HSL | hsl(191, 71%, 29%) |
| OKLCH | oklch(49.3% 0.082 218) |
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 #166C80 | 6.01:1 | AA | Lc -84.9 | Fine for body text |
| Black text on #166C80 | 3.49:1 | AA large text | Lc 24.4 | Dividers and decoration only |
| #166C80 text on white | 6.01:1 | AA | Lc 79.7 | Fine for body text |
| #166C80 text on black | 3.49:1 | AA large text | Lc -22.1 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E2ECEF
oklch(93.6% 0.011 217.5)
-
Step 200
200
#CADDE3
oklch(88.5% 0.022 218.6)
-
Step 300
300
#A5C7D2
oklch(80.8% 0.04 219.4)
-
Step 400
400
#72ABBB
oklch(70.8% 0.064 217.3)
-
Step 500
500
#4995AA
oklch(63% 0.081 218.3)
-
Step 600
600
#257F96
oklch(55.5% 0.089 218.9)
-
Step 700
700 (this color)
#166C80
oklch(49.3% 0.082 218)
-
Step 800
800
#165868
oklch(42.8% 0.068 217.9)
-
Step 900
900
#1B4854
oklch(37.6% 0.053 218.2)
-
Step 950
950
#112A31
oklch(26.8% 0.033 218.4)
#166C80 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) | #5F6981 | 0.070 |
| Deuteranopia (no green cones) | #515F80 | 0.062 |
| Tritanopia (no blue cones) | #007372 | 0.037 |
| Achromatopsia (no color) | #636363 | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #166C80
#166C80
oklch(49.3% 0.082 218)
- #89503E
#89503E
oklch(49.3% 0.082 38.3)
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 #166C80, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Turquoise #017374 ΔE 0.034
- Dark Aqua #05696B ΔE 0.035
- Sea Blue #047495 ΔE 0.036
- Deep Aqua #08787F ΔE 0.038
- Dark Aquamarine #017371 ΔE 0.038
- Peacock Blue #016795 ΔE 0.042
- Ocean Blue #03719C ΔE 0.044
- Denim #3B638C ΔE 0.045
Use #166C80 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.