#166B64
Closest named color: Dark Aqua (#05696B). oklch(47.8% 0.077 186.5), rgb(22, 107, 100).
Aa
White text reads best on this color (6.32:1).
About this color
#166B64 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 48%, its chroma 0.077 and its hue 187°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Aqua (#05696B), ΔE 0.016 away. White text reads best on it, at 6.32:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.077) |
| Temperature | cool |
| Nearest name | Dark Aqua (#05696B) |
| Black text | 3.32:1 |
| White text | 6.32:1 |
Values
| HEX | #166B64 |
| RGB | rgb(22, 107, 100) |
| HSL | hsl(175, 66%, 25%) |
| OKLCH | oklch(47.8% 0.077 186.5) |
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 #166B64 | 6.32:1 | AA | Lc -86.2 | Fine for body text |
| Black text on #166B64 | 3.32:1 | AA large text | Lc 22.9 | Dividers and decoration only |
| #166B64 text on white | 6.32:1 | AA | Lc 81.1 | Fine for body text |
| #166B64 text on black | 3.32:1 | AA large text | Lc -20.8 | 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
#F2F7F6
oklch(97.2% 0.005 183)
-
Step 100
100
#E2ECEB
oklch(93.5% 0.011 189.8)
-
Step 200
200
#CBDEDB
oklch(88.6% 0.021 185.4)
-
Step 300
300
#A6C9C4
oklch(80.9% 0.038 185.9)
-
Step 400
400
#75ADA6
oklch(70.7% 0.06 186.1)
-
Step 500
500
#4D9991
oklch(63.2% 0.077 186.5)
-
Step 600
600
#2B837B
oklch(55.6% 0.083 186.5)
-
Step 700
700 (this color)
#166B64
oklch(47.8% 0.077 186.5)
-
Step 800
800
#1B5A54
oklch(42.6% 0.064 186.1)
-
Step 900
900
#1D4A46
oklch(37.6% 0.05 187.4)
-
Step 950
950
#132B29
oklch(26.9% 0.03 188.5)
#166B64 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) | #656564 | 0.082 |
| Deuteranopia (no green cones) | #595C65 | 0.077 |
| Tritanopia (no blue cones) | #006E69 | 0.011 |
| Achromatopsia (no color) | #606060 | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #166B64
#166B64
oklch(47.8% 0.077 186.5)
- #824A56
#824A56
oklch(47.9% 0.077 6.6)
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 #166B64, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Aqua #05696B ΔE 0.016
- Dark Aquamarine #017371 ΔE 0.027
- Dark Green Blue #1F6357 ΔE 0.027
- Deep Turquoise #017374 ΔE 0.030
- Petrol #005F6A ΔE 0.045
- Bluegreen #017A79 ΔE 0.049
- Deep Aqua #08787F ΔE 0.050
- Slate #516572 ΔE 0.064
Use #166B64 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.