#166E75
Closest named color: Deep Turquoise (#017374). oklch(49.3% 0.078 203.2), rgb(22, 110, 117).
Aa
White text reads best on this color (5.96:1).
About this color
#166E75 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 49%, its chroma 0.078 and its hue 203°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Turquoise (#017374), ΔE 0.017 away. White text reads best on it, at 5.96:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (49%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Deep Turquoise (#017374) |
| Black text | 3.52:1 |
| White text | 5.96:1 |
Values
| HEX | #166E75 |
| RGB | rgb(22, 110, 117) |
| HSL | hsl(184, 68%, 27%) |
| OKLCH | oklch(49.3% 0.078 203.2) |
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 #166E75 | 5.96:1 | AA | Lc -84.7 | Fine for body text |
| Black text on #166E75 | 3.52:1 | AA large text | Lc 24.6 | Dividers and decoration only |
| #166E75 text on white | 5.96:1 | AA | Lc 79.4 | Fine for body text |
| #166E75 text on black | 3.52:1 | AA large text | Lc -22.4 | 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
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E2ECED
oklch(93.6% 0.011 204.1)
-
Step 200
200
#CADDDF
oklch(88.4% 0.021 204.4)
-
Step 300
300
#A5C8CB
oklch(80.8% 0.038 202.8)
-
Step 400
400
#73ACB1
oklch(70.7% 0.06 202.9)
-
Step 500
500
#49979E
oklch(63% 0.077 203.2)
-
Step 600
600
#258289
oklch(55.7% 0.084 202.4)
-
Step 700
700 (this color)
#166E75
oklch(49.3% 0.078 203.2)
-
Step 800
800
#16595F
oklch(42.7% 0.065 203.9)
-
Step 900
900
#1B494D
oklch(37.6% 0.05 203.1)
-
Step 950
950
#112B2D
oklch(27% 0.032 202.1)
#166E75 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) | #656976 | 0.079 |
| Deuteranopia (no green cones) | #585F75 | 0.073 |
| Tritanopia (no blue cones) | #007370 | 0.021 |
| Achromatopsia (no color) | #636363 | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #166E75
#166E75
oklch(49.3% 0.078 203.2)
- #884F4C
#884F4C
oklch(49.3% 0.077 23.5)
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 #166E75, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Turquoise #017374 ΔE 0.017
- Dark Aquamarine #017371 ΔE 0.019
- Dark Aqua #05696B ΔE 0.022
- Deep Aqua #08787F ΔE 0.030
- Bluegreen #017A79 ΔE 0.036
- Petrol #005F6A ΔE 0.049
- Sea Blue #047495 ΔE 0.050
- Dark Green Blue #1F6357 ΔE 0.051
Use #166E75 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.