#166A6C
Closest named color: Dark Aqua (#05696B). oklch(47.9% 0.075 197.4), rgb(22, 106, 108).
Aa
White text reads best on this color (6.34:1).
About this color
#166A6C is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 48%, its chroma 0.075 and its hue 197°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Aqua (#05696B), ΔE 0.007 away. White text reads best on it, at 6.34:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Dark Aqua (#05696B) |
| Black text | 3.31:1 |
| White text | 6.34:1 |
Values
| HEX | #166A6C |
| RGB | rgb(22, 106, 108) |
| HSL | hsl(181, 66%, 25%) |
| OKLCH | oklch(47.9% 0.075 197.4) |
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 #166A6C | 6.34:1 | AA | Lc -86.3 | Fine for body text |
| Black text on #166A6C | 3.31:1 | AA large text | Lc 22.9 | Dividers and decoration only |
| #166A6C text on white | 6.34:1 | AA | Lc 81.2 | Fine for body text |
| #166A6C text on black | 3.31:1 | AA large text | Lc -20.7 | 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
#F2F6F6
oklch(97% 0.004 197.1)
-
Step 100
100
#E2ECEC
oklch(93.6% 0.011 197)
-
Step 200
200
#CBDDDE
oklch(88.4% 0.019 200.8)
-
Step 300
300
#A6C8C9
oklch(80.8% 0.036 198.7)
-
Step 400
400
#75ACAD
oklch(70.7% 0.058 197.4)
-
Step 500
500
#4D9799
oklch(63% 0.074 197.8)
-
Step 600
600
#2B8284
oklch(55.7% 0.081 197.3)
-
Step 700
700 (this color)
#166A6C
oklch(47.9% 0.075 197.4)
-
Step 800
800
#1A595B
oklch(42.6% 0.062 198.1)
-
Step 900
900
#1D4A4B
oklch(37.8% 0.049 197.3)
-
Step 950
950
#122B2C
oklch(27% 0.031 198.9)
#166A6C 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) | #62656C | 0.077 |
| Deuteranopia (no green cones) | #565C6C | 0.071 |
| Tritanopia (no blue cones) | #006E6A | 0.015 |
| Achromatopsia (no color) | #5F5F5F | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #166A6C
#166A6C
oklch(47.9% 0.075 197.4)
- #824B4E
#824B4E
oklch(47.8% 0.075 16.8)
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 #166A6C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Aqua #05696B ΔE 0.007
- Dark Aquamarine #017371 ΔE 0.027
- Deep Turquoise #017374 ΔE 0.027
- Dark Green Blue #1F6357 ΔE 0.034
- Petrol #005F6A ΔE 0.037
- Deep Aqua #08787F ΔE 0.046
- Bluegreen #017A79 ΔE 0.048
- Slate #516572 ΔE 0.057
Use #166A6C 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.