#166A78
Closest named color: Dark Aqua (#05696B). oklch(48.4% 0.078 211.8), rgb(22, 106, 120).
Aa
White text reads best on this color (6.23:1).
About this color
#166A78 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 48%, its chroma 0.078 and its hue 212°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Aqua (#05696B), ΔE 0.023 away. White text reads best on it, at 6.23:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Dark Aqua (#05696B) |
| Black text | 3.36:1 |
| White text | 6.23:1 |
Values
| HEX | #166A78 |
| RGB | rgb(22, 106, 120) |
| HSL | hsl(189, 69%, 28%) |
| OKLCH | oklch(48.4% 0.078 211.8) |
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 #166A78 | 6.23:1 | AA | Lc -85.9 | Fine for body text |
| Black text on #166A78 | 3.36:1 | AA large text | Lc 23.3 | Dividers and decoration only |
| #166A78 text on white | 6.23:1 | AA | Lc 80.7 | Fine for body text |
| #166A78 text on black | 3.36:1 | AA large text | Lc -21.1 | 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
#E2ECEE
oklch(93.6% 0.011 211)
-
Step 200
200
#CADDE1
oklch(88.5% 0.021 211.8)
-
Step 300
300
#A6C8CF
oklch(81% 0.038 211.5)
-
Step 400
400
#74ABB6
oklch(70.7% 0.06 211.5)
-
Step 500
500
#4B96A4
oklch(63.1% 0.077 211.3)
-
Step 600
600
#298090
oklch(55.6% 0.084 212.4)
-
Step 700
700 (this color)
#166A78
oklch(48.4% 0.078 211.8)
-
Step 800
800
#195863
oklch(42.6% 0.064 211.6)
-
Step 900
900
#1C4951
oklch(37.8% 0.051 211)
-
Step 950
950
#122B2F
oklch(27.1% 0.032 209)
#166A78 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) | #5F6679 | 0.072 |
| Deuteranopia (no green cones) | #525C78 | 0.066 |
| Tritanopia (no blue cones) | #00706E | 0.029 |
| Achromatopsia (no color) | #616161 | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #166A78
#166A78
oklch(48.4% 0.078 211.8)
- #854D43
#854D43
oklch(48.3% 0.078 31)
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 #166A78, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Aqua #05696B ΔE 0.023
- Deep Turquoise #017374 ΔE 0.031
- Dark Aquamarine #017371 ΔE 0.034
- Petrol #005F6A ΔE 0.040
- Deep Aqua #08787F ΔE 0.042
- Sea Blue #047495 ΔE 0.049
- Bluegreen #017A79 ΔE 0.050
- Peacock Blue #016795 ΔE 0.051
Use #166A78 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.