#166E70
Closest named color: Deep Turquoise (#017374). oklch(49.1% 0.078 197.3), rgb(22, 110, 112).
Aa
White text reads best on this color (6.00:1).
About this color
#166E70 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 49%, its chroma 0.078 and its hue 197°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Turquoise (#017374), ΔE 0.015 away. White text reads best on it, at 6.00:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (49%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Deep Turquoise (#017374) |
| Black text | 3.49:1 |
| White text | 6.00:1 |
Values
| HEX | #166E70 |
| RGB | rgb(22, 110, 112) |
| HSL | hsl(181, 67%, 26%) |
| OKLCH | oklch(49.1% 0.078 197.3) |
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 #166E70 | 6.00:1 | AA | Lc -84.8 | Fine for body text |
| Black text on #166E70 | 3.49:1 | AA large text | Lc 24.4 | Dividers and decoration only |
| #166E70 text on white | 6.00:1 | AA | Lc 79.6 | Fine for body text |
| #166E70 text on black | 3.49:1 | AA large text | Lc -22.2 | 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
#CADEDE
oklch(88.6% 0.021 196.8)
-
Step 300
300
#A5C9C9
oklch(81% 0.038 196.4)
-
Step 400
400
#73ADAE
oklch(70.8% 0.06 197.3)
-
Step 500
500
#4A989A
oklch(63.1% 0.077 197.6)
-
Step 600
600
#268284
oklch(55.6% 0.083 197.2)
-
Step 700
700 (this color)
#166E70
oklch(49.1% 0.078 197.3)
-
Step 800
800
#175A5B
oklch(42.8% 0.064 196.5)
-
Step 900
900
#1B4A4B
oklch(37.8% 0.05 197.2)
-
Step 950
950
#122B2C
oklch(27% 0.031 198.9)
#166E70 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) | #666870 | 0.081 |
| Deuteranopia (no green cones) | #595F71 | 0.075 |
| Tritanopia (no blue cones) | #00726E | 0.015 |
| Achromatopsia (no color) | #636363 | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #166E70
#166E70
oklch(49.1% 0.078 197.3)
- #874E50
#874E50
oklch(49.1% 0.077 18)
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 #166E70, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Turquoise #017374 ΔE 0.015
- Dark Aquamarine #017371 ΔE 0.016
- Dark Aqua #05696B ΔE 0.018
- Deep Aqua #08787F ΔE 0.033
- Bluegreen #017A79 ΔE 0.036
- Dark Green Blue #1F6357 ΔE 0.045
- Petrol #005F6A ΔE 0.049
- Teal #008080 ΔE 0.054
Use #166E70 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.