#166A5E
Closest named color: Dark Green Blue (#1F6357). oklch(47.3% 0.079 180.7), rgb(22, 106, 94).
Aa
White text reads best on this color (6.44:1).
About this color
#166A5E is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 47%, its chroma 0.079 and its hue 181°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Green Blue (#1F6357), ΔE 0.021 away. White text reads best on it, at 6.44:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (47%) |
| Chroma | moderately saturated (0.079) |
| Temperature | cool |
| Nearest name | Dark Green Blue (#1F6357) |
| Black text | 3.25:1 |
| White text | 6.44:1 |
Values
| HEX | #166A5E |
| RGB | rgb(22, 106, 94) |
| HSL | hsl(171, 66%, 25%) |
| OKLCH | oklch(47.3% 0.079 180.7) |
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 #166A5E | 6.44:1 | AA | Lc -86.8 | Fine for body text |
| Black text on #166A5E | 3.25:1 | AA large text | Lc 22.4 | Dividers and decoration only |
| #166A5E text on white | 6.44:1 | AA | Lc 81.7 | Fine for body text |
| #166A5E text on black | 3.25:1 | AA large text | Lc -20.2 | 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
#F2F7F5
oklch(97.2% 0.006 170.4)
-
Step 100
100
#E2ECEA
oklch(93.5% 0.011 182.9)
-
Step 200
200
#CBDEDA
oklch(88.5% 0.021 181.8)
-
Step 300
300
#A7C9C2
oklch(80.9% 0.038 181.5)
-
Step 400
400
#76ADA2
oklch(70.6% 0.06 180.6)
-
Step 500
500
#4E998C
oklch(63.1% 0.078 181)
-
Step 600
600
#2D8376
oklch(55.5% 0.084 181.3)
-
Step 700
700 (this color)
#166A5E
oklch(47.3% 0.079 180.7)
-
Step 800
800
#1C5B51
oklch(42.8% 0.065 180.5)
-
Step 900
900
#1E4A43
oklch(37.6% 0.05 181.6)
-
Step 950
950
#132C27
oklch(27.1% 0.033 179.2)
#166A5E 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) | #65635E | 0.084 |
| Deuteranopia (no green cones) | #5A5B5F | 0.079 |
| Tritanopia (no blue cones) | #006C66 | 0.013 |
| Achromatopsia (no color) | #5E5E5E | 0.079 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #166A5E
#166A5E
oklch(47.3% 0.079 180.7)
- #804859
#804859
oklch(47.3% 0.079 1.1)
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 #166A5E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Green Blue #1F6357 ΔE 0.021
- Dark Aqua #05696B ΔE 0.023
- Dark Aquamarine #017371 ΔE 0.034
- Deep Turquoise #017374 ΔE 0.038
- Petrol #005F6A ΔE 0.047
- Bluegreen #017A79 ΔE 0.055
- Deep Aqua #08787F ΔE 0.058
- Spruce #0A5F38 ΔE 0.062
Use #166A5E 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.