#166B61
Closest named color: Dark Aqua (#05696B). oklch(47.7% 0.078 183.1), rgb(22, 107, 97).
Aa
White text reads best on this color (6.34:1).
About this color
#166B61 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 48%, its chroma 0.078 and its hue 183°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Aqua (#05696B), ΔE 0.020 away. White text reads best on it, at 6.34:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Dark Aqua (#05696B) |
| Black text | 3.30:1 |
| White text | 6.34:1 |
Values
| HEX | #166B61 |
| RGB | rgb(22, 107, 97) |
| HSL | hsl(173, 66%, 25%) |
| OKLCH | oklch(47.7% 0.078 183.1) |
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 #166B61 | 6.34:1 | AA | Lc -86.3 | Fine for body text |
| Black text on #166B61 | 3.30:1 | AA large text | Lc 22.8 | Dividers and decoration only |
| #166B61 text on white | 6.34:1 | AA | Lc 81.2 | Fine for body text |
| #166B61 text on black | 3.30:1 | 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
#F2F7F6
oklch(97.2% 0.005 183)
-
Step 100
100
#E2ECEA
oklch(93.5% 0.011 182.9)
-
Step 200
200
#CBDEDA
oklch(88.5% 0.021 181.8)
-
Step 300
300
#A7C9C3
oklch(80.9% 0.037 183.5)
-
Step 400
400
#75ADA4
oklch(70.6% 0.06 183.4)
-
Step 500
500
#4D998E
oklch(63.1% 0.078 183.2)
-
Step 600
600
#2B8378
oklch(55.5% 0.084 183.4)
-
Step 700
700 (this color)
#166B61
oklch(47.7% 0.078 183.1)
-
Step 800
800
#1B5A52
oklch(42.6% 0.064 183.2)
-
Step 900
900
#1E4A44
oklch(37.6% 0.05 183.5)
-
Step 950
950
#132C28
oklch(27.2% 0.032 182.2)
#166B61 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) | #656461 | 0.083 |
| Deuteranopia (no green cones) | #5A5C62 | 0.079 |
| Tritanopia (no blue cones) | #006D68 | 0.011 |
| Achromatopsia (no color) | #5F5F5F | 0.079 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #166B61
#166B61
oklch(47.7% 0.078 183.1)
- #814958
#814958
oklch(47.6% 0.078 3.2)
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 #166B61, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Aqua #05696B ΔE 0.020
- Dark Green Blue #1F6357 ΔE 0.025
- Dark Aquamarine #017371 ΔE 0.030
- Deep Turquoise #017374 ΔE 0.033
- Petrol #005F6A ΔE 0.047
- Bluegreen #017A79 ΔE 0.051
- Deep Aqua #08787F ΔE 0.053
- Spruce #0A5F38 ΔE 0.067
Use #166B61 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.