#166D81
Closest named color: Deep Turquoise (#017374). oklch(49.6% 0.083 217.8), rgb(22, 109, 129).
Aa
White text reads best on this color (5.93:1).
About this color
#166D81 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 50%, its chroma 0.083 and its hue 218°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Turquoise (#017374), ΔE 0.033 away. White text reads best on it, at 5.93:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Deep Turquoise (#017374) |
| Black text | 3.53:1 |
| White text | 5.93:1 |
Values
| HEX | #166D81 |
| RGB | rgb(22, 109, 129) |
| HSL | hsl(191, 71%, 30%) |
| OKLCH | oklch(49.6% 0.083 217.8) |
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 #166D81 | 5.93:1 | AA | Lc -84.5 | Fine for body text |
| Black text on #166D81 | 3.53:1 | AA large text | Lc 24.8 | Dividers and decoration only |
| #166D81 text on white | 5.93:1 | AA | Lc 79.3 | Fine for body text |
| #166D81 text on black | 3.53:1 | AA large text | Lc -22.5 | 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
#4896AA
oklch(63.2% 0.082 216.9)
-
Step 600
600
#248096
oklch(55.7% 0.089 217.7)
-
Step 700
700 (this color)
#166D81
oklch(49.6% 0.083 217.8)
-
Step 800
800
#155868
oklch(42.8% 0.069 217.8)
-
Step 900
900
#1A4854
oklch(37.6% 0.053 217.9)
-
Step 950
950
#112A31
oklch(26.8% 0.033 218.4)
#166D81 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) | #606A82 | 0.071 |
| Deuteranopia (no green cones) | #525F81 | 0.064 |
| Tritanopia (no blue cones) | #007473 | 0.037 |
| Achromatopsia (no color) | #646464 | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #166D81
#166D81
oklch(49.6% 0.083 217.8)
- #8A503F
#8A503F
oklch(49.5% 0.083 37.1)
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 #166D81, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Turquoise #017374 ΔE 0.033
- Sea Blue #047495 ΔE 0.033
- Deep Aqua #08787F ΔE 0.035
- Dark Aqua #05696B ΔE 0.037
- Dark Aquamarine #017371 ΔE 0.037
- Peacock Blue #016795 ΔE 0.042
- Ocean Blue #03719C ΔE 0.042
- Ocean #017B92 ΔE 0.044
Use #166D81 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.