#166E63
Closest named color: Dark Aquamarine (#017371). oklch(48.6% 0.081 182.3), rgb(22, 110, 99).
Aa
White text reads best on this color (6.09:1).
About this color
#166E63 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 49%, its chroma 0.081 and its hue 182°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Aquamarine (#017371), ΔE 0.023 away. White text reads best on it, at 6.09:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (49%) |
| Chroma | moderately saturated (0.081) |
| Temperature | cool |
| Nearest name | Dark Aquamarine (#017371) |
| Black text | 3.44:1 |
| White text | 6.09:1 |
Values
| HEX | #166E63 |
| RGB | rgb(22, 110, 99) |
| HSL | hsl(173, 67%, 26%) |
| OKLCH | oklch(48.6% 0.081 182.3) |
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 #166E63 | 6.09:1 | AA | Lc -85.3 | Fine for body text |
| Black text on #166E63 | 3.44:1 | AA large text | Lc 24.0 | Dividers and decoration only |
| #166E63 text on white | 6.09:1 | AA | Lc 80.1 | Fine for body text |
| #166E63 text on black | 3.44:1 | 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
#F2F7F6
oklch(97.2% 0.005 183)
-
Step 100
100
#E2ECEA
oklch(93.5% 0.011 182.9)
-
Step 200
200
#CADEDA
oklch(88.5% 0.022 182.5)
-
Step 300
300
#A6C9C2
oklch(80.8% 0.039 181.8)
-
Step 400
400
#74AEA4
oklch(70.8% 0.062 182.5)
-
Step 500
500
#4B998D
oklch(63% 0.08 182.4)
-
Step 600
600
#288477
oklch(55.7% 0.087 181.7)
-
Step 700
700 (this color)
#166E63
oklch(48.6% 0.081 182.3)
-
Step 800
800
#185B52
oklch(42.8% 0.067 182.2)
-
Step 900
900
#1C4B44
oklch(37.8% 0.052 182.2)
-
Step 950
950
#122C28
oklch(27.1% 0.033 182.6)
#166E63 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) | #686763 | 0.085 |
| Deuteranopia (no green cones) | #5D5E64 | 0.082 |
| Tritanopia (no blue cones) | #00706B | 0.012 |
| Achromatopsia (no color) | #626262 | 0.081 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #166E63
#166E63
oklch(48.6% 0.081 182.3)
- #854B5B
#854B5B
oklch(48.6% 0.081 2.8)
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 #166E63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Aquamarine #017371 ΔE 0.023
- Dark Aqua #05696B ΔE 0.025
- Deep Turquoise #017374 ΔE 0.027
- Dark Green Blue #1F6357 ΔE 0.034
- Bluegreen #017A79 ΔE 0.043
- Deep Aqua #08787F ΔE 0.046
- Petrol #005F6A ΔE 0.055
- Teal #008080 ΔE 0.061
Use #166E63 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.