#166A8A
Closest named color: Peacock Blue (#016795). oklch(49.2% 0.09 229.5), rgb(22, 106, 138).
Aa
White text reads best on this color (6.06:1).
About this color
#166A8A is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 49%, its chroma 0.090 and its hue 230°. Its hue sits on the cool side of the wheel. The nearest named color is Peacock Blue (#016795), ΔE 0.023 away. White text reads best on it, at 6.06:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (49%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Peacock Blue (#016795) |
| Black text | 3.46:1 |
| White text | 6.06:1 |
Values
| HEX | #166A8A |
| RGB | rgb(22, 106, 138) |
| HSL | hsl(197, 72%, 31%) |
| OKLCH | oklch(49.2% 0.09 229.5) |
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 #166A8A | 6.06:1 | AA | Lc -85.1 | Fine for body text |
| Black text on #166A8A | 3.46:1 | AA large text | Lc 24.2 | Dividers and decoration only |
| #166A8A text on white | 6.06:1 | AA | Lc 79.9 | Fine for body text |
| #166A8A text on black | 3.46:1 | AA large text | Lc -21.9 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2ECF1
oklch(93.7% 0.013 228.9)
-
Step 200
200
#CADDE6
oklch(88.6% 0.024 227.8)
-
Step 300
300
#A5C7D8
oklch(81% 0.044 229.6)
-
Step 400
400
#72A9C4
oklch(70.7% 0.07 230.2)
-
Step 500
500
#4994B5
oklch(63.2% 0.089 229.2)
-
Step 600
600
#257DA1
oklch(55.5% 0.097 230.1)
-
Step 700
700 (this color)
#166A8A
oklch(49.2% 0.09 229.5)
-
Step 800
800
#165670
oklch(42.6% 0.075 230)
-
Step 900
900
#1B475A
oklch(37.6% 0.058 229.5)
-
Step 950
950
#112A35
oklch(27.1% 0.037 229)
#166A8A 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) | #59688C | 0.062 |
| Deuteranopia (no green cones) | #4A5E8A | 0.053 |
| Tritanopia (no blue cones) | #007375 | 0.051 |
| Achromatopsia (no color) | #626262 | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #166A8A
#166A8A
oklch(49.2% 0.09 229.5)
- #8A502F
#8A502F
oklch(49.2% 0.091 49.1)
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 #166A8A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Peacock Blue #016795 ΔE 0.023
- Sea Blue #047495 ΔE 0.031
- Ocean Blue #03719C ΔE 0.031
- Denim #3B638C ΔE 0.032
- Light Navy Blue #2E5A88 ΔE 0.048
- Muted Blue #3B719F ΔE 0.048
- Ocean #017B92 ΔE 0.050
- Deep Aqua #08787F ΔE 0.052
Use #166A8A 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.