#166E81
Closest named color: Deep Turquoise (#017374). oklch(49.8% 0.083 216.6), rgb(22, 110, 129).
Aa
White text reads best on this color (5.86:1).
About this color
#166E81 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 50%, its chroma 0.083 and its hue 217°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Turquoise (#017374), ΔE 0.031 away. White text reads best on it, at 5.86:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Deep Turquoise (#017374) |
| Black text | 3.58:1 |
| White text | 5.86:1 |
Values
| HEX | #166E81 |
| RGB | rgb(22, 110, 129) |
| HSL | hsl(191, 71%, 30%) |
| OKLCH | oklch(49.8% 0.083 216.6) |
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 #166E81 | 5.86:1 | AA | Lc -84.2 | Fine for body text |
| Black text on #166E81 | 3.58:1 | AA large text | Lc 25.1 | Dividers and decoration only |
| #166E81 text on white | 5.86:1 | AA | Lc 78.9 | Fine for body text |
| #166E81 text on black | 3.58:1 | AA large text | Lc -22.9 | 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
#A4C8D1
oklch(81% 0.04 214.6)
-
Step 400
400
#71ABBA
oklch(70.7% 0.064 215.8)
-
Step 500
500
#4896A9
oklch(63.1% 0.081 215.9)
-
Step 600
600
#238095
oklch(55.7% 0.089 216.6)
-
Step 700
700 (this color)
#166E81
oklch(49.8% 0.083 216.6)
-
Step 800
800
#155867
oklch(42.7% 0.068 216.5)
-
Step 900
900
#1A4954
oklch(37.8% 0.053 215.9)
-
Step 950
950
#112B31
oklch(27.1% 0.034 214.8)
#166E81 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) | #616A82 | 0.072 |
| Deuteranopia (no green cones) | #536081 | 0.065 |
| Tritanopia (no blue cones) | #007574 | 0.035 |
| Achromatopsia (no color) | #656565 | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #166E81
#166E81
oklch(49.8% 0.083 216.6)
- #8B5141
#8B5141
oklch(49.8% 0.082 36.2)
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 #166E81, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Turquoise #017374 ΔE 0.031
- Deep Aqua #08787F ΔE 0.032
- Sea Blue #047495 ΔE 0.032
- Dark Aquamarine #017371 ΔE 0.035
- Dark Aqua #05696B ΔE 0.037
- Ocean #017B92 ΔE 0.041
- Ocean Blue #03719C ΔE 0.042
- Bluegreen #017A79 ΔE 0.043
Use #166E81 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.