#166B81
Closest named color: Sea Blue (#047495). oklch(49% 0.083 220.2), rgb(22, 107, 129).
Aa
White text reads best on this color (6.07:1).
About this color
#166B81 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 49%, its chroma 0.083 and its hue 220°. Its hue sits on the cool side of the wheel. The nearest named color is Sea Blue (#047495), ΔE 0.036 away. White text reads best on it, at 6.07:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (49%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Sea Blue (#047495) |
| Black text | 3.45:1 |
| White text | 6.07:1 |
Values
| HEX | #166B81 |
| RGB | rgb(22, 107, 129) |
| HSL | hsl(192, 71%, 30%) |
| OKLCH | oklch(49% 0.083 220.2) |
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 #166B81 | 6.07:1 | AA | Lc -85.2 | Fine for body text |
| Black text on #166B81 | 3.45:1 | AA large text | Lc 24.1 | Dividers and decoration only |
| #166B81 text on white | 6.07:1 | AA | Lc 80.0 | Fine for body text |
| #166B81 text on black | 3.45:1 | AA large text | Lc -21.8 | 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
#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
#A5C7D3
oklch(80.9% 0.04 221.2)
-
Step 400
400
#72AABC
oklch(70.6% 0.064 220.1)
-
Step 500
500
#4A95AC
oklch(63.1% 0.082 220.5)
-
Step 600
600
#267F97
oklch(55.6% 0.089 219.9)
-
Step 700
700 (this color)
#166B81
oklch(49% 0.083 220.2)
-
Step 800
800
#175769
oklch(42.6% 0.069 220.9)
-
Step 900
900
#1B4855
oklch(37.7% 0.053 219.9)
-
Step 950
950
#112A32
oklch(26.9% 0.034 221.3)
#166B81 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) | #5E6882 | 0.069 |
| Deuteranopia (no green cones) | #505E81 | 0.061 |
| Tritanopia (no blue cones) | #007272 | 0.038 |
| Achromatopsia (no color) | #626262 | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #166B81
#166B81
oklch(49% 0.083 220.2)
- #884F3B
#884F3B
oklch(48.9% 0.083 40)
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 #166B81, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Blue #047495 ΔE 0.036
- Dark Aqua #05696B ΔE 0.037
- Deep Turquoise #017374 ΔE 0.038
- Peacock Blue #016795 ΔE 0.038
- Deep Aqua #08787F ΔE 0.042
- Dark Aquamarine #017371 ΔE 0.042
- Denim #3B638C ΔE 0.042
- Ocean Blue #03719C ΔE 0.043
Use #166B81 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.